chore: bump to version 0.0.25

- Document StreamingTranscriptBuffer as the single owner of text assembly
- Note provider adapter layer (IProviderEventAdapter.TryAdapt) for event
  normalization and how to add new providers
- Add capability metadata to protocol boundary description
- Update assistant-intent events as provider-neutral (not Copilot-specific)
- Add provider event normalization to sidecar runtime boundary

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

ARCHITECTURE.md

@@ -55,8 +55,8 @@ flowchart LR
 | --- | --- | --- | --- |
 | Renderer | Screens, interaction, local view composition, theme application | Filesystem, process spawning, raw Electron access, Copilot runtime | Typed preload API and pushed events |
 | Preload | Narrow bridge between browser context and Electron IPC | Business logic, persistence, orchestration | `ipcRenderer` / `ipcMain` |
-| Main process | Workspace mutation, persistence, git inspection/write operations, run change attribution, commit workflow orchestration, session lifecycle, native window state, sidecar lifecycle, PTY-backed terminal lifecycle | UI rendering, LLM orchestration internals | IPC, filesystem, git CLI, stdio with sidecar, native child processes |
-| Sidecar | Capability discovery, workflow validation, run execution, streaming deltas and activity | UI, workspace persistence, Electron APIs | Line-delimited JSON over stdio |
+| Main process | Workspace mutation, persistence, git inspection/write operations, run change attribution, commit workflow orchestration, session lifecycle, native window state, global hotkey registration, sidecar lifecycle, PTY-backed terminal lifecycle | UI rendering, LLM orchestration internals | IPC, filesystem, git CLI, stdio with sidecar, native child processes |
+| Sidecar | Capability discovery, workflow validation, run execution, provider event normalization, streaming deltas and activity, streamed text assembly | UI, workspace persistence, Electron APIs | Line-delimited JSON over stdio |
 | External systems | Git data, Copilot account/model access, OS window chrome | Application state and UI behavior | Controlled adapters owned by main or sidecar |
 
 This split is the most important architectural feature in the app. It is what keeps the system understandable as more capabilities are added.
@@ -143,7 +143,9 @@ Their runtime semantics follow the Agent Framework orchestration model: sequenti
 
 For Copilot-backed agents, Aryx uses a repo-local provider module around the Copilot SDK session layer so workflow agent routes still behave like Agent Framework handoffs. This is necessary because the upstream `GitHubCopilotAgent` does not currently project run-time handoff tool declarations into Copilot sessions or surface Copilot tool requests back as `FunctionCallContent` for the workflow runtime.
 
-The sidecar now keeps that Copilot-specific behavior behind provider seams. Core execution uses shared `IAgentProvider`, `IProviderTurnSupport`, `ProviderSessionEvent`, `ProviderAgentBundle`, `TurnExecutionState`, and `AgentWorkflowTurnRunner` abstractions, while `Services/Providers/Copilot/` owns SDK-specific bundle creation, transcript projection, approvals, user input, MCP OAuth, exit-plan-mode handling, CLI/session management, and event adaptation.
+The sidecar now keeps that Copilot-specific behavior behind provider seams. Core execution uses shared `IAgentProvider`, `IProviderTurnSupport`, `ProviderSessionEvent`, `ProviderAgentBundle`, `TurnExecutionState`, and `AgentWorkflowTurnRunner` abstractions, while `Services/Providers/Copilot/` owns SDK-specific bundle creation, transcript projection, approvals, user input, MCP OAuth, exit-plan-mode handling, CLI/session management, and event adaptation. Provider adapters implement `IProviderEventAdapter.TryAdapt()` to translate provider-native session events into the normalized `ProviderSessionEvent` records that `TurnExecutionState` consumes. The Copilot adapter is the first concrete implementation; adding a second provider means writing a new adapter without changing the turn-state machine or the main-process contract.
+
+Streamed text assembly is a single-owner responsibility. The sidecar's `StreamingTranscriptBuffer` resolves content deltas and snapshot-mode content from provider events, producing authoritative `content` fields on every message-delta event. The main process forwards that resolved content to the renderer, which trusts it directly without re-running merge logic. This eliminates the duplicate text-assembly that previously caused glitches when the sidecar, main process, and renderer each independently merged streaming text.
 
 Workflows are shared application data, not renderer-only configuration. The same workflow definition now drives validation, persistence, session execution, and sidecar orchestration.
 
@@ -216,7 +218,7 @@ This is a structured stdio protocol used for:
 - streaming partial output
 - streaming agent activity
 
-This protocol boundary keeps the AI execution runtime replaceable and prevents the Electron main process from becoming overloaded with workflow-specific behavior. On the sidecar side, raw provider events are first normalized into sidecar-owned provider event records before they become streamed run activity, so future providers can plug into the same transport without reshaping the main-process contract.
+This protocol boundary keeps the AI execution runtime replaceable and prevents the Electron main process from becoming overloaded with workflow-specific behavior. On the sidecar side, raw provider events are first normalized into sidecar-owned provider event records (via `IProviderEventAdapter`) before they become streamed run activity, so future providers can plug into the same transport without reshaping the main-process contract. Each event carries capability metadata so the main process and renderer can degrade gracefully when a provider does not support intent, reasoning, or fine-grained tool progress.
 
 The protocol also carries **turn-scoped lifecycle events** alongside output deltas. These events let the UI visualize execution internals without the main process having to interpret AI workflow semantics:
 
@@ -225,7 +227,7 @@ The protocol also carries **turn-scoped lifecycle events** alongside output delt
 - **Sub-agent events**: started, completed, failed, selected, deselected — surfaced when custom agents are defined
 - **Skill invocation events**: emitted when an agent-side skill is triggered
 - **Message reclassification events**: let the sidecar retroactively mark a streamed assistant message as `thinking` once the SDK confirms that message requested tool work, so the UI can separate intermediate planning chatter from the final response without sacrificing live streaming
-- **Assistant intent and reasoning-delta events**: optional Copilot SDK metadata that exposes short "what I'm doing" labels plus incremental reasoning text for richer thinking-process surfaces
+- **Assistant intent and reasoning-delta events**: optional provider metadata that exposes short "what I'm doing" labels plus incremental reasoning text for richer thinking-process surfaces; normalized through the provider adapter layer so the UI consumes them uniformly regardless of provider origin
 - **Hook lifecycle events**: start and end of configured project hook commands discovered from `.github/hooks/*.json`; Aryx suppresses the SDK's built-in no-op hook chatter so the UI only sees meaningful hook activity
 - **Assistant usage events**: per-LLM-call tokens, cost, AIU, and quota snapshots from the Copilot SDK's `assistant.usage` stream
 - **Session compaction events**: start and complete, with token-reduction metrics when infinite sessions trigger context trimming
@@ -350,7 +352,8 @@ That gives the system:
 
 The main process owns desktop concerns such as:
 
-- native window creation
+- native window creation (main window and quick prompt overlay)
+- global hotkey registration
 - title bar behavior
 - background process management
 - filesystem access
@@ -358,13 +361,28 @@ The main process owns desktop concerns such as:
 
 This keeps those concerns out of the renderer while still letting the UI feel native.
 
+### Multi-window setup and Quick Prompt
+
+Aryx runs two `BrowserWindow` instances:
+
+- the **main window** — the full workspace UI
+- the **quick prompt window** — a frameless, transparent, always-on-top overlay for one-off AI questions
+
+The quick prompt window loads a separate, lightweight renderer entry (`quickprompt.html` / `quickprompt.tsx`) with its own preload script (`preload/quickprompt.ts`). This keeps its bundle small and avoids loading the full workspace renderer. It communicates with the main process through dedicated IPC channels prefixed with `quick-prompt:`.
+
+A **global hotkey service** (`src/main/services/globalHotkey.ts`) registers a system-wide keyboard shortcut (default `Super+Shift+A`, configurable in settings) using Electron's `globalShortcut` API. Pressing the hotkey toggles the quick prompt window. The service re-registers the shortcut when the configured hotkey changes and unregisters on app quit.
+
+Quick prompt sessions are real `SessionRecord` instances created on the scratchpad project. The main process routes matching session events from the sidecar to the quick prompt window's `webContents`. After a response completes, the user can discard the session, close the window (preserving the session for later access in the main UI), or continue the conversation in the main window.
+
+The `window-all-closed` handler excludes the quick prompt window so the app does not stay alive solely because the hidden popup exists.
+
 ## Build and release architecture
 
 Aryx ships as an Electron application bundled together with a self-contained .NET sidecar.
 
 The build pipeline is organized around three layers:
 
-- building the Electron renderer and main process assets
+- building the Electron renderer entries (main workspace and quick prompt) and main process assets
 - publishing the sidecar for the target runtime
 - packaging platform artifacts with electron-builder
 

README.md

@@ -45,6 +45,7 @@ Aryx is a desktop app that turns GitHub Copilot into a full workspace. Connect r
 | Message actions | Copy, pin, edit-and-resend, and regenerate individual messages |
 | Bookmarks | Browse all pinned messages across sessions in one panel (`Ctrl+Shift+B`) |
 | System tray | Minimize to tray, quick-launch scratchpads, and see running session count |
+| Quick Prompt | System-wide hotkey (`Win+Shift+A` / `Cmd+Shift+A`) summons a floating popup for instant AI questions from any app |
 | Desktop notifications | Native OS alerts when runs complete, fail, or need approval |
 | Onboarding | First-launch walkthrough, interactive tooltips, and a "try it" quickstart |
 

electron.vite.config.ts

@@ -20,6 +20,12 @@ export default defineConfig({
   preload: {
     build: {
       outDir: 'dist-electron/preload',
+      rollupOptions: {
+        input: {
+          index: resolve(__dirname, 'src/preload/index.ts'),
+          quickprompt: resolve(__dirname, 'src/preload/quickprompt.ts'),
+        },
+      },
     },
     plugins: [externalizeDepsPlugin()],
     resolve: {
@@ -32,6 +38,12 @@ export default defineConfig({
     root: 'src/renderer',
     build: {
       outDir: 'dist/renderer',
+      rollupOptions: {
+        input: {
+          index: resolve(__dirname, 'src/renderer/index.html'),
+          quickprompt: resolve(__dirname, 'src/renderer/quickprompt.html'),
+        },
+      },
     },
     plugins: [react(), tailwindcss()],
     resolve: {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "aryx",
-  "version": "0.0.24",
+  "version": "0.0.25",
   "description": "Orchestrator for Copilot-powered agent workflows across multiple projects.",
   "private": true,
   "main": "dist-electron/main/index.js",

sidecar/src/Aryx.AgentHost/Contracts/ProviderSessionEvent.cs

@@ -2,10 +2,13 @@ namespace Aryx.AgentHost.Contracts;
 
 internal abstract record ProviderSessionEvent;
 
-internal sealed record ProviderAssistantMessageDeltaEvent(string MessageId) : ProviderSessionEvent;
+internal sealed record ProviderAssistantMessageDeltaEvent(
+    string MessageId,
+    string? DeltaContent) : ProviderSessionEvent;
 
 internal sealed record ProviderAssistantMessageEvent(
     string MessageId,
+    string? Content,
     bool HasToolRequests) : ProviderSessionEvent;
 
 internal sealed record ProviderToolExecutionStartEvent(
@@ -13,12 +16,35 @@ internal sealed record ProviderToolExecutionStartEvent(
     string ToolName,
     IReadOnlyDictionary<string, object?>? ToolArguments) : ProviderSessionEvent;
 
+internal sealed record ProviderToolExecutionProgressEvent(
+    string ToolCallId,
+    string? ProgressMessage) : ProviderSessionEvent;
+
+internal sealed record ProviderToolExecutionPartialResultEvent(
+    string ToolCallId,
+    string? PartialOutput) : ProviderSessionEvent;
+
+internal sealed record ProviderToolExecutionCompleteEvent(
+    string ToolCallId,
+    bool Success,
+    string? ResultContent,
+    string? DetailedResultContent,
+    string? Error) : ProviderSessionEvent;
+
 internal sealed record ProviderAssistantIntentEvent(string? Intent) : ProviderSessionEvent;
 
 internal sealed record ProviderAssistantReasoningDeltaEvent(
     string? ReasoningId,
     string? DeltaContent) : ProviderSessionEvent;
 
+internal sealed record ProviderAssistantReasoningEvent(
+    string? ReasoningId,
+    string? Content) : ProviderSessionEvent;
+
+internal sealed record ProviderAssistantTurnStartEvent(string? TurnId) : ProviderSessionEvent;
+
+internal sealed record ProviderAssistantTurnEndEvent(string? TurnId) : ProviderSessionEvent;
+
 internal sealed record ProviderSubagentStartedEvent(
     string? ToolCallId,
     string? AgentName,

sidecar/src/Aryx.AgentHost/Contracts/ProviderTurnStreamCapabilities.cs

@@ -0,0 +1,28 @@
+namespace Aryx.AgentHost.Contracts;
+
+internal sealed record ProviderTurnStreamCapabilities
+{
+    public static ProviderTurnStreamCapabilities None { get; } = new();
+
+    public bool SupportsIntent { get; init; }
+
+    public bool SupportsReasoningDelta { get; init; }
+
+    public bool SupportsReasoningBlock { get; init; }
+
+    public bool SupportsToolExecutionProgress { get; init; }
+
+    public bool SupportsToolExecutionPartialResult { get; init; }
+
+    public bool SupportsToolExecutionCompletion { get; init; }
+
+    public bool SupportsSubagentLifecycle { get; init; }
+
+    public bool SupportsHookLifecycle { get; init; }
+
+    public bool SupportsSessionCompaction { get; init; }
+
+    public bool SupportsPendingMessagesMutation { get; init; }
+
+    public bool SupportsSessionTurnBoundaries { get; init; }
+}

sidecar/src/Aryx.AgentHost/Contracts/ProviderTurnStreamSnapshots.cs

@@ -0,0 +1,38 @@
+namespace Aryx.AgentHost.Contracts;
+
+internal enum ProviderToolExecutionStatus
+{
+    Running,
+    Completed,
+    Failed,
+}
+
+internal sealed record ProviderToolExecutionSnapshot
+{
+    public string ToolCallId { get; init; } = string.Empty;
+
+    public string? ToolName { get; init; }
+
+    public IReadOnlyDictionary<string, object?>? ToolArguments { get; init; }
+
+    public ProviderToolExecutionStatus Status { get; init; }
+
+    public string? LatestProgressMessage { get; init; }
+
+    public string PartialOutput { get; init; } = string.Empty;
+
+    public string? ResultContent { get; init; }
+
+    public string? DetailedResultContent { get; init; }
+
+    public string? Error { get; init; }
+}
+
+internal sealed record ProviderReasoningSnapshot
+{
+    public string ReasoningId { get; init; } = string.Empty;
+
+    public string Content { get; init; } = string.Empty;
+
+    public bool IsComplete { get; init; }
+}

sidecar/src/Aryx.AgentHost/Services/AgentWorkflowTurnRunner.cs

@@ -100,7 +100,7 @@ public class AgentWorkflowTurnRunner : ITurnWorkflowRunner
                         onDelta,
                         onEvent)
                     .ConfigureAwait(false);
-                await EmitPendingEventsAsync(state, onEvent).ConfigureAwait(false);
+                await EmitPendingEventsAsync(state, onDelta, onEvent).ConfigureAwait(false);
                 await EmitPendingMcpOauthRequestsAsync(state, onMcpOAuthRequired).ConfigureAwait(false);
                 if (shouldEndTurn)
                 {
@@ -108,13 +108,13 @@ public class AgentWorkflowTurnRunner : ITurnWorkflowRunner
                 }
             }
 
-            await EmitPendingEventsAsync(state, onEvent).ConfigureAwait(false);
+            await EmitPendingEventsAsync(state, onDelta, onEvent).ConfigureAwait(false);
             await EmitPendingMcpOauthRequestsAsync(state, onMcpOAuthRequired).ConfigureAwait(false);
             return state.FinalizeCompletedMessages(transcriptProjector);
         }
         catch (OperationCanceledException) when (runCancellation.IsCancellationRequested && !cancellationToken.IsCancellationRequested)
         {
-            await EmitPendingEventsAsync(state, onEvent).ConfigureAwait(false);
+            await EmitPendingEventsAsync(state, onDelta, onEvent).ConfigureAwait(false);
             await EmitPendingMcpOauthRequestsAsync(state, onMcpOAuthRequired).ConfigureAwait(false);
             ExitPlanModeRequestedEventDto? exitPlanModeEvent =
                 _providerTurnSupport.ConsumePendingExitPlanModeRequest(command.RequestId);
@@ -230,10 +230,17 @@ public class AgentWorkflowTurnRunner : ITurnWorkflowRunner
 
     private static async Task EmitPendingEventsAsync(
         TurnExecutionState state,
+        Func<TurnDeltaEventDto, Task> onDelta,
         Func<SidecarEventDto, Task> onEvent)
     {
         foreach (SidecarEventDto pendingEvent in state.DrainPendingEvents())
         {
+            if (pendingEvent is TurnDeltaEventDto delta)
+            {
+                await onDelta(delta).ConfigureAwait(false);
+                continue;
+            }
+
             await onEvent(pendingEvent).ConfigureAwait(false);
         }
     }
@@ -326,8 +333,7 @@ public class AgentWorkflowTurnRunner : ITurnWorkflowRunner
                 command,
                 requestInfo,
                 state.ActiveAgent,
-                state.ToolNamesByCallId,
-                state.ToolCallHasArgumentsById);
+                state.ToolCalls);
 
             if (activity is null)
             {
@@ -524,10 +530,14 @@ public class AgentWorkflowTurnRunner : ITurnWorkflowRunner
         }
 
         string messageId = state.CreateMessageId(update.Update.MessageId);
-        (string _, string currentAuthorName, string currentContent) = state.AppendDelta(
+        if (!state.TryAppendDelta(
             messageId,
             authorName,
-            update.Update.Text);
+            update.Update.Text,
+            out TranscriptSegment currentSegment))
+        {
+            return;
+        }
 
         await onDelta(new TurnDeltaEventDto
         {
@@ -535,9 +545,9 @@ public class AgentWorkflowTurnRunner : ITurnWorkflowRunner
             RequestId = command.RequestId,
             SessionId = command.SessionId,
             MessageId = messageId,
-            AuthorName = currentAuthorName,
+            AuthorName = currentSegment.AuthorName,
             ContentDelta = update.Update.Text,
-            Content = currentContent,
+            Content = currentSegment.Content,
         }).ConfigureAwait(false);
     }
 

sidecar/src/Aryx.AgentHost/Services/IProviderEventAdapter.cs

@@ -4,5 +4,7 @@ namespace Aryx.AgentHost.Services;
 
 internal interface IProviderEventAdapter
 {
+    ProviderTurnStreamCapabilities Capabilities { get; }
+
     ProviderSessionEvent? TryAdapt(object rawEvent);
 }

sidecar/src/Aryx.AgentHost/Services/Providers/Copilot/CopilotApprovalCoordinator.cs

@@ -70,7 +70,7 @@ internal sealed class CopilotApprovalCoordinator
         WorkflowNodeDto agent,
         PermissionRequest request,
         PermissionInvocation invocation,
-        IReadOnlyDictionary<string, string> toolNamesByCallId,
+        ToolCallRegistry toolCalls,
         Func<ApprovalRequestedEventDto, Task> onApproval,
         CancellationToken cancellationToken)
     {
@@ -79,7 +79,7 @@ internal sealed class CopilotApprovalCoordinator
                 agent,
                 request,
                 invocation,
-                toolNamesByCallId,
+                toolCalls,
                 onActivity: null,
                 onApproval,
                 cancellationToken)
@@ -91,12 +91,12 @@ internal sealed class CopilotApprovalCoordinator
         WorkflowNodeDto agent,
         PermissionRequest request,
         PermissionInvocation invocation,
-        IReadOnlyDictionary<string, string> toolNamesByCallId,
+        ToolCallRegistry toolCalls,
         Func<AgentActivityEventDto, Task>? onActivity,
         Func<ApprovalRequestedEventDto, Task> onApproval,
         CancellationToken cancellationToken)
     {
-        string? toolName = ResolveApprovalToolName(request, toolNamesByCallId);
+        string? toolName = ResolveApprovalToolName(request, toolCalls);
         string? autoApprovedToolName = ResolveAutoApprovedToolName(request);
         string? mcpServerApprovalKey = ResolveMcpServerApprovalKey(request, command.Tooling?.McpServers);
         string? approvalCacheKey = ResolveApprovalCacheKey(toolName, autoApprovedToolName);
@@ -339,15 +339,15 @@ internal sealed class CopilotApprovalCoordinator
 
     internal static bool TryGetApprovalToolName(
         PermissionRequest request,
-        IReadOnlyDictionary<string, string>? toolNamesByCallId,
+        ToolCallRegistry? toolCalls,
         out string? toolName)
     {
-        toolName = ResolveApprovalToolName(request, toolNamesByCallId);
+        toolName = ResolveApprovalToolName(request, toolCalls);
         return toolName is not null;
     }
 
     internal static bool TryGetApprovalToolName(PermissionRequest request, out string? toolName)
-        => TryGetApprovalToolName(request, toolNamesByCallId: null, out toolName);
+        => TryGetApprovalToolName(request, toolCalls: null, out toolName);
 
     internal void ClearRequestApprovals(string requestId)
     {
@@ -404,10 +404,10 @@ internal sealed class CopilotApprovalCoordinator
 
     private static string? ResolveApprovalToolName(
         PermissionRequest request,
-        IReadOnlyDictionary<string, string>? toolNamesByCallId)
+        ToolCallRegistry? toolCalls)
     {
         return GetDirectToolName(request)
-            ?? ResolveToolNameFromLookup(request, toolNamesByCallId)
+            ?? ResolveToolNameFromLookup(request, toolCalls)
             ?? GetFallbackToolName(request);
     }
 
@@ -480,16 +480,16 @@ internal sealed class CopilotApprovalCoordinator
 
     private static string? ResolveToolNameFromLookup(
         PermissionRequest request,
-        IReadOnlyDictionary<string, string>? toolNamesByCallId)
+        ToolCallRegistry? toolCalls)
     {
-        if (toolNamesByCallId is null)
+        if (toolCalls is null)
         {
             return null;
         }
 
         string? toolCallId = GetToolCallId(request);
         if (toolCallId is null
-            || !toolNamesByCallId.TryGetValue(toolCallId, out string? resolvedToolName))
+            || !toolCalls.TryGetToolName(toolCallId, out string? resolvedToolName))
         {
             return null;
         }

sidecar/src/Aryx.AgentHost/Services/Providers/Copilot/CopilotEventAdapter.cs

@@ -5,18 +5,34 @@ namespace Aryx.AgentHost.Services;
 
 internal sealed class CopilotEventAdapter : IProviderEventAdapter
 {
+    public ProviderTurnStreamCapabilities Capabilities { get; } = new()
+    {
+        SupportsIntent = true,
+        SupportsReasoningDelta = true,
+        SupportsReasoningBlock = true,
+        SupportsToolExecutionProgress = true,
+        SupportsToolExecutionPartialResult = true,
+        SupportsToolExecutionCompletion = true,
+        SupportsSubagentLifecycle = true,
+        SupportsHookLifecycle = true,
+        SupportsSessionCompaction = true,
+        SupportsPendingMessagesMutation = true,
+        SupportsSessionTurnBoundaries = true,
+    };
+
     public ProviderSessionEvent? TryAdapt(object rawEvent)
     {
         return rawEvent switch
         {
             AssistantMessageDeltaEvent messageDelta
                 when NormalizeRequiredString(messageDelta.Data?.MessageId) is { } messageId =>
-                new ProviderAssistantMessageDeltaEvent(messageId),
+                new ProviderAssistantMessageDeltaEvent(messageId, messageDelta.Data?.DeltaContent),
 
             AssistantMessageEvent assistantMessage
                 when NormalizeRequiredString(assistantMessage.Data?.MessageId) is { } messageId =>
                 new ProviderAssistantMessageEvent(
                     messageId,
+                    assistantMessage.Data?.Content,
                     assistantMessage.Data?.ToolRequests is { Length: > 0 }),
 
             ToolExecutionStartEvent toolExecutionStart
@@ -27,6 +43,27 @@ internal sealed class CopilotEventAdapter : IProviderEventAdapter
                     toolName,
                     WorkflowRequestInfoInterpreter.NormalizeRawToolArguments(toolExecutionStart.Data?.Arguments)),
 
+            ToolExecutionProgressEvent toolExecutionProgress
+                when NormalizeRequiredString(toolExecutionProgress.Data?.ToolCallId) is { } toolCallId =>
+                new ProviderToolExecutionProgressEvent(
+                    toolCallId,
+                    NormalizeOptionalString(toolExecutionProgress.Data?.ProgressMessage)),
+
+            ToolExecutionPartialResultEvent toolExecutionPartialResult
+                when NormalizeRequiredString(toolExecutionPartialResult.Data?.ToolCallId) is { } toolCallId =>
+                new ProviderToolExecutionPartialResultEvent(
+                    toolCallId,
+                    toolExecutionPartialResult.Data?.PartialOutput),
+
+            ToolExecutionCompleteEvent toolExecutionComplete
+                when NormalizeRequiredString(toolExecutionComplete.Data?.ToolCallId) is { } toolCallId =>
+                new ProviderToolExecutionCompleteEvent(
+                    toolCallId,
+                    toolExecutionComplete.Data?.Success ?? false,
+                    NormalizeOptionalString(toolExecutionComplete.Data?.Result?.Content),
+                    NormalizeOptionalString(toolExecutionComplete.Data?.Result?.DetailedContent),
+                    NormalizeOptionalString(toolExecutionComplete.Data?.Error?.Message)),
+
             AssistantIntentEvent intentEvent =>
                 new ProviderAssistantIntentEvent(NormalizeOptionalString(intentEvent.Data?.Intent)),
 
@@ -35,6 +72,17 @@ internal sealed class CopilotEventAdapter : IProviderEventAdapter
                     NormalizeOptionalString(reasoningDelta.Data?.ReasoningId),
                     reasoningDelta.Data?.DeltaContent),
 
+            AssistantReasoningEvent reasoning =>
+                new ProviderAssistantReasoningEvent(
+                    NormalizeOptionalString(reasoning.Data?.ReasoningId),
+                    reasoning.Data?.Content),
+
+            AssistantTurnStartEvent turnStart =>
+                new ProviderAssistantTurnStartEvent(NormalizeOptionalString(turnStart.Data?.TurnId)),
+
+            AssistantTurnEndEvent turnEnd =>
+                new ProviderAssistantTurnEndEvent(NormalizeOptionalString(turnEnd.Data?.TurnId)),
+
             SubagentStartedEvent started =>
                 new ProviderSubagentStartedEvent(
                     started.Data?.ToolCallId,

sidecar/src/Aryx.AgentHost/Services/Providers/Copilot/CopilotTurnRunnerSupport.cs

@@ -20,6 +20,8 @@ internal sealed class CopilotTurnRunnerSupport : IProviderTurnSupport
         CancellationTokenSource runCancellation,
         CancellationToken cancellationToken)
     {
+        state.SetStreamCapabilities(_providerEventAdapter.Capabilities);
+
         return await CopilotAgentBundle.CreateAsync(
                 command,
                 (agent, request, invocation) => _approvalCoordinator.RequestApprovalAsync(
@@ -27,7 +29,7 @@ internal sealed class CopilotTurnRunnerSupport : IProviderTurnSupport
                     agent,
                     request,
                     invocation,
-                    state.ToolNamesByCallId,
+                    state.ToolCalls,
                     activity => AgentWorkflowTurnRunner.EmitActivityAsync(command, state, activity, onEvent),
                     onApproval,
                     runCancellation.Token),

sidecar/src/Aryx.AgentHost/Services/Providers/Copilot/WorkflowTranscriptProjector.cs

@@ -1,16 +1,9 @@
-using System.Text;
 using Aryx.AgentHost.Contracts;
 using GitHub.Copilot.SDK;
 using Microsoft.Extensions.AI;
 
 namespace Aryx.AgentHost.Services;
 
-internal readonly record struct TranscriptSegment(string MessageId, string AuthorName, string Content)
-{
-    public static TranscriptSegment FromTuple((string MessageId, string AuthorName, string Content) segment)
-        => new(segment.MessageId, segment.AuthorName, segment.Content);
-}
-
 internal static class WorkflowTranscriptProjector
 {
     public static ChatMessage ToChatMessage(ChatMessageDto message)
@@ -146,10 +139,16 @@ internal static class WorkflowTranscriptProjector
         ChatMessage message,
         TranscriptSegment? matchedSegment)
     {
+        if (matchedSegment is { IsFinalized: true } finalizedSegment
+            && !string.IsNullOrWhiteSpace(finalizedSegment.Content))
+        {
+            return finalizedSegment.Content;
+        }
+
         return FirstNonBlank(
                 message.Text,
-                matchedSegment?.Content,
-                TryGetAssistantMessageContent(message))
+                TryGetAssistantMessageContent(message),
+                matchedSegment?.Content)
             ?? string.Empty;
     }
 
@@ -227,6 +226,16 @@ internal static class WorkflowTranscriptProjector
             return null;
         }
 
+        string? messageId = FirstNonBlank(message.MessageId);
+        if (messageId is not null
+            && TryFindSegment(
+                remainingSegments,
+                segment => string.Equals(segment.MessageId, messageId, StringComparison.Ordinal),
+                out TranscriptSegment messageIdMatchedSegment))
+        {
+            return messageIdMatchedSegment;
+        }
+
         string? messageText = string.IsNullOrWhiteSpace(message.Text) ? null : message.Text;
         if (messageText is not null)
         {
@@ -445,70 +454,3 @@ internal static class WorkflowTranscriptProjector
         return null;
     }
 }
-
-internal sealed class StreamingTranscriptBuffer
-{
-    private readonly List<BufferedTranscriptSegment> _segments = [];
-
-    public int Count => _segments.Count;
-
-    public TranscriptSegment AppendDelta(
-        string messageId,
-        string authorName,
-        string delta)
-    {
-        BufferedTranscriptSegment segment = GetOrCreateSegment(messageId, authorName);
-        segment.SetContent(StreamingTextMerger.Merge(segment.Content.ToString(), delta));
-        segment.SetAuthorName(authorName);
-        return segment.ToSnapshot();
-    }
-
-    public IReadOnlyList<TranscriptSegment> Snapshot()
-    {
-        return _segments.Select(segment => segment.ToSnapshot()).ToList();
-    }
-
-    private BufferedTranscriptSegment GetOrCreateSegment(string messageId, string authorName)
-    {
-        BufferedTranscriptSegment? existing = _segments.LastOrDefault(segment => segment.MessageId == messageId);
-        if (existing is not null)
-        {
-            return existing;
-        }
-
-        BufferedTranscriptSegment created = new(messageId, authorName);
-        _segments.Add(created);
-        return created;
-    }
-
-    private sealed class BufferedTranscriptSegment
-    {
-        public BufferedTranscriptSegment(string messageId, string authorName)
-        {
-            MessageId = messageId;
-            AuthorName = authorName;
-        }
-
-        public string MessageId { get; }
-
-        public string AuthorName { get; private set; }
-
-        public StringBuilder Content { get; } = new();
-
-        public void SetContent(string value)
-        {
-            Content.Clear();
-            Content.Append(value);
-        }
-
-        public void SetAuthorName(string value)
-        {
-            AuthorName = value;
-        }
-
-        public TranscriptSegment ToSnapshot()
-        {
-            return new TranscriptSegment(MessageId, AuthorName, Content.ToString());
-        }
-    }
-}

sidecar/src/Aryx.AgentHost/Services/StreamingTranscriptBuffer.cs

@@ -0,0 +1,142 @@
+using System.Text;
+
+namespace Aryx.AgentHost.Services;
+
+internal readonly record struct TranscriptSegment(
+    string MessageId,
+    string AuthorName,
+    string Content,
+    bool IsFinalized = false)
+{
+    public static TranscriptSegment FromTuple((string MessageId, string AuthorName, string Content) segment)
+        => new(segment.MessageId, segment.AuthorName, segment.Content);
+
+    public void Deconstruct(out string messageId, out string authorName, out string content)
+    {
+        messageId = MessageId;
+        authorName = AuthorName;
+        content = Content;
+    }
+}
+
+internal sealed class StreamingTranscriptBuffer
+{
+    private readonly List<BufferedTranscriptSegment> _segments = [];
+
+    public int Count => _segments.Count;
+
+    public TranscriptSegment AppendDelta(
+        string messageId,
+        string authorName,
+        string delta)
+    {
+        _ = TryAppendDelta(messageId, authorName, delta, out TranscriptSegment segment);
+        return segment;
+    }
+
+    public bool TryAppendDelta(
+        string messageId,
+        string authorName,
+        string delta,
+        out TranscriptSegment segment)
+    {
+        BufferedTranscriptSegment bufferedSegment = GetOrCreateSegment(messageId, authorName);
+        bool contentChanged = bufferedSegment.TryAppendDelta(authorName, delta);
+        segment = bufferedSegment.ToSnapshot();
+        return contentChanged;
+    }
+
+    public bool TryApplySnapshot(
+        string messageId,
+        string authorName,
+        string content,
+        out TranscriptSegment segment)
+    {
+        BufferedTranscriptSegment bufferedSegment = GetOrCreateSegment(messageId, authorName);
+        bool visibleContentChanged = bufferedSegment.TryApplySnapshot(authorName, content);
+        segment = bufferedSegment.ToSnapshot();
+        return visibleContentChanged;
+    }
+
+    public IReadOnlyList<TranscriptSegment> Snapshot()
+    {
+        return _segments.Select(segment => segment.ToSnapshot()).ToList();
+    }
+
+    private BufferedTranscriptSegment GetOrCreateSegment(string messageId, string authorName)
+    {
+        BufferedTranscriptSegment? existing = _segments.LastOrDefault(segment => segment.MessageId == messageId);
+        if (existing is not null)
+        {
+            return existing;
+        }
+
+        BufferedTranscriptSegment created = new(messageId, authorName);
+        _segments.Add(created);
+        return created;
+    }
+
+    private sealed class BufferedTranscriptSegment
+    {
+        public BufferedTranscriptSegment(string messageId, string authorName)
+        {
+            MessageId = messageId;
+            AuthorName = authorName;
+        }
+
+        public string MessageId { get; }
+
+        public string AuthorName { get; private set; }
+
+        public bool IsFinalized { get; private set; }
+
+        public StringBuilder Content { get; } = new();
+
+        public bool TryAppendDelta(string authorName, string delta)
+        {
+            SetAuthorName(authorName);
+            if (IsFinalized || string.IsNullOrEmpty(delta))
+            {
+                return false;
+            }
+
+            string currentContent = Content.ToString();
+            string mergedContent = StreamingTextMerger.Merge(currentContent, delta);
+            if (string.Equals(currentContent, mergedContent, StringComparison.Ordinal))
+            {
+                return false;
+            }
+
+            SetContent(mergedContent);
+            return true;
+        }
+
+        public bool TryApplySnapshot(string authorName, string content)
+        {
+            SetAuthorName(authorName);
+            string normalizedContent = content ?? string.Empty;
+            string currentContent = Content.ToString();
+            bool visibleContentChanged = !string.Equals(currentContent, normalizedContent, StringComparison.Ordinal);
+
+            SetContent(normalizedContent);
+            IsFinalized = true;
+            return visibleContentChanged;
+        }
+
+        private void SetContent(string value)
+        {
+            Content.Clear();
+            Content.Append(value);
+        }
+
+        private void SetAuthorName(string value)
+        {
+            AuthorName = value;
+        }
+
+        public TranscriptSegment ToSnapshot()
+        {
+            return new TranscriptSegment(MessageId, AuthorName, Content.ToString(), IsFinalized);
+        }
+    }
+}

sidecar/src/Aryx.AgentHost/Services/ToolCallRegistry.cs

@@ -0,0 +1,165 @@
+using System.Collections.Concurrent;
+using System.Diagnostics.CodeAnalysis;
+using Aryx.AgentHost.Contracts;
+
+namespace Aryx.AgentHost.Services;
+
+internal sealed class ToolCallRegistry
+{
+    private readonly ConcurrentDictionary<string, ProviderToolExecutionSnapshot> _toolExecutionsByCallId = new(StringComparer.Ordinal);
+
+    public bool TryGetExecution(string? toolCallId, [NotNullWhen(true)] out ProviderToolExecutionSnapshot? snapshot)
+    {
+        snapshot = null;
+        return !string.IsNullOrWhiteSpace(toolCallId)
+            && _toolExecutionsByCallId.TryGetValue(toolCallId, out snapshot);
+    }
+
+    public bool TryGetToolName(string? toolCallId, [NotNullWhen(true)] out string? toolName)
+    {
+        toolName = null;
+        return TryGetExecution(toolCallId, out ProviderToolExecutionSnapshot? snapshot)
+            && !string.IsNullOrWhiteSpace(snapshot.ToolName)
+            && (toolName = snapshot.ToolName) is not null;
+    }
+
+    public bool HasTrackedArguments(string? toolCallId)
+    {
+        return TryGetExecution(toolCallId, out ProviderToolExecutionSnapshot? snapshot)
+            && snapshot.ToolArguments is { Count: > 0 };
+    }
+
+    public void RecordToolStart(
+        string toolCallId,
+        string toolName,
+        IReadOnlyDictionary<string, object?>? toolArguments)
+    {
+        _toolExecutionsByCallId.AddOrUpdate(
+            toolCallId,
+            static (id, state) => new ProviderToolExecutionSnapshot
+            {
+                ToolCallId = id,
+                ToolName = state.ToolName,
+                ToolArguments = state.ToolArguments,
+                Status = ProviderToolExecutionStatus.Running,
+            },
+            static (_, existing, state) => existing with
+            {
+                ToolName = state.ToolName,
+                ToolArguments = state.ToolArguments,
+                Status = ProviderToolExecutionStatus.Running,
+            },
+            (ToolName: toolName, ToolArguments: toolArguments));
+    }
+
+    public bool TryRecordToolRequest(
+        string? toolCallId,
+        string toolName,
+        IReadOnlyDictionary<string, object?>? toolArguments)
+    {
+        bool hasToolArguments = toolArguments is { Count: > 0 };
+        string? normalizedToolCallId = NormalizeOptionalString(toolCallId);
+        if (normalizedToolCallId is null)
+        {
+            return true;
+        }
+
+        if (_toolExecutionsByCallId.TryGetValue(normalizedToolCallId, out ProviderToolExecutionSnapshot? existing))
+        {
+            bool trackedHasArguments = existing.ToolArguments is { Count: > 0 };
+            if (trackedHasArguments || !hasToolArguments)
+            {
+                return false;
+            }
+        }
+
+        _toolExecutionsByCallId.AddOrUpdate(
+            normalizedToolCallId,
+            id => new ProviderToolExecutionSnapshot
+            {
+                ToolCallId = id,
+                ToolName = toolName,
+                ToolArguments = toolArguments,
+                Status = ProviderToolExecutionStatus.Running,
+            },
+            (_, existing) => existing with
+            {
+                ToolName = toolName,
+                ToolArguments = toolArguments,
+                Status = existing.Status is ProviderToolExecutionStatus.Completed or ProviderToolExecutionStatus.Failed
+                    ? existing.Status
+                    : ProviderToolExecutionStatus.Running,
+            });
+        return true;
+    }
+
+    public void RecordProgress(string toolCallId, string? progressMessage)
+    {
+        string? normalizedProgress = NormalizeOptionalString(progressMessage);
+        _toolExecutionsByCallId.AddOrUpdate(
+            toolCallId,
+            id => new ProviderToolExecutionSnapshot
+            {
+                ToolCallId = id,
+                Status = ProviderToolExecutionStatus.Running,
+                LatestProgressMessage = normalizedProgress,
+            },
+            (_, existing) => existing with
+            {
+                Status = existing.Status is ProviderToolExecutionStatus.Completed or ProviderToolExecutionStatus.Failed
+                    ? existing.Status
+                    : ProviderToolExecutionStatus.Running,
+                LatestProgressMessage = normalizedProgress ?? existing.LatestProgressMessage,
+            });
+    }
+
+    public void RecordPartialResult(string toolCallId, string? partialOutput)
+    {
+        if (string.IsNullOrEmpty(partialOutput))
+        {
+            return;
+        }
+
+        _toolExecutionsByCallId.AddOrUpdate(
+            toolCallId,
+            id => new ProviderToolExecutionSnapshot
+            {
+                ToolCallId = id,
+                Status = ProviderToolExecutionStatus.Running,
+                PartialOutput = partialOutput,
+            },
+            (_, existing) => existing with
+            {
+                Status = existing.Status is ProviderToolExecutionStatus.Completed or ProviderToolExecutionStatus.Failed
+                    ? existing.Status
+                    : ProviderToolExecutionStatus.Running,
+                PartialOutput = string.Concat(existing.PartialOutput, partialOutput),
+            });
+    }
+
+    public void RecordCompletion(ProviderToolExecutionCompleteEvent toolExecution)
+    {
+        _toolExecutionsByCallId.AddOrUpdate(
+            toolExecution.ToolCallId,
+            id => new ProviderToolExecutionSnapshot
+            {
+                ToolCallId = id,
+                Status = toolExecution.Success ? ProviderToolExecutionStatus.Completed : ProviderToolExecutionStatus.Failed,
+                ResultContent = toolExecution.ResultContent,
+                DetailedResultContent = toolExecution.DetailedResultContent,
+                Error = toolExecution.Error,
+            },
+            (_, existing) => existing with
+            {
+                Status = toolExecution.Success ? ProviderToolExecutionStatus.Completed : ProviderToolExecutionStatus.Failed,
+                ResultContent = toolExecution.ResultContent ?? existing.ResultContent,
+                DetailedResultContent = toolExecution.DetailedResultContent ?? existing.DetailedResultContent,
+                Error = toolExecution.Error ?? existing.Error,
+            });
+    }
+
+    private static string? NormalizeOptionalString(string? value)
+    {
+        return string.IsNullOrWhiteSpace(value) ? null : value.Trim();
+    }
+}

sidecar/src/Aryx.AgentHost/Services/TurnExecutionState.cs

@@ -1,4 +1,5 @@
 using System.Collections.Concurrent;
+using System.Diagnostics.CodeAnalysis;
 using Aryx.AgentHost.Contracts;
 using Microsoft.Extensions.AI;
 
@@ -14,6 +15,8 @@ internal class TurnExecutionState
     private readonly ConcurrentQueue<SidecarEventDto> _pendingEvents = new();
     private readonly ConcurrentQueue<McpOauthRequiredEventDto> _pendingMcpOauthRequests = new();
     private readonly ConcurrentDictionary<string, AgentIdentity> _observedAgentsByMessageId = new(StringComparer.Ordinal);
+    private readonly ConcurrentDictionary<string, ProviderReasoningSnapshot> _reasoningById = new(StringComparer.Ordinal);
+    private readonly ConcurrentDictionary<string, string> _latestIntentByAgentId = new(StringComparer.Ordinal);
     private readonly StreamingTranscriptBuffer _transcriptBuffer = new();
     private int _fallbackMessageIndex;
     private string? _lastObservedMessageId;
@@ -25,9 +28,7 @@ internal class TurnExecutionState
         _agentSubworkflowIndex = AgentIdentityResolver.BuildAgentSubworkflowIndex(command.Workflow, _workflowLibrary);
     }
 
-    public ConcurrentDictionary<string, string> ToolNamesByCallId { get; } = new(StringComparer.Ordinal);
-
-    public ConcurrentDictionary<string, bool> ToolCallHasArgumentsById { get; } = new(StringComparer.Ordinal);
+    public ToolCallRegistry ToolCalls { get; } = new();
 
     public AgentIdentity? ActiveAgent { get; private set; }
 
@@ -35,8 +36,19 @@ internal class TurnExecutionState
 
     public bool HasPendingExitPlanModeRequest { get; private set; }
 
+    public ProviderTurnStreamCapabilities StreamCapabilities { get; private set; } = ProviderTurnStreamCapabilities.None;
+
+    public string? CurrentProviderTurnId { get; private set; }
+
+    public string? LatestCompletedProviderTurnId { get; private set; }
+
     public bool SuppressHookLifecycleEvents { get; set; }
 
+    public void SetStreamCapabilities(ProviderTurnStreamCapabilities capabilities)
+    {
+        StreamCapabilities = capabilities ?? throw new ArgumentNullException(nameof(capabilities));
+    }
+
     public AgentIdentity ResolveAgentIdentity(string? agentId, string? agentName)
     {
         return AgentIdentityResolver.ResolveAgentIdentity(
@@ -143,6 +155,20 @@ internal class TurnExecutionState
             case ProviderAssistantMessageEvent assistantMessage:
                 RecordObservedAgentForMessage(agent, assistantMessage.MessageId);
                 QueueThinkingIfNeeded(agent);
+                if (!string.IsNullOrWhiteSpace(assistantMessage.Content)
+                    && TryFinalizeTranscriptMessage(
+                        assistantMessage.MessageId,
+                        agent.AgentName,
+                        assistantMessage.Content,
+                        out TranscriptSegment finalizedSegment))
+                {
+                    _pendingEvents.Enqueue(CreateTurnDeltaEvent(
+                        finalizedSegment.MessageId,
+                        finalizedSegment.AuthorName,
+                        string.Empty,
+                        finalizedSegment.Content));
+                }
+
                 if (assistantMessage.HasToolRequests)
                 {
                     QueueMessageReclassifiedIfNeeded(assistantMessage.MessageId);
@@ -151,20 +177,36 @@ internal class TurnExecutionState
             case ProviderToolExecutionStartEvent toolExecutionStart:
                 string toolCallId = toolExecutionStart.ToolCallId;
                 string toolName = toolExecutionStart.ToolName;
-                TrackToolCall(toolCallId, toolName, toolExecutionStart.ToolArguments);
+                bool shouldQueueToolActivity = TrackToolCall(toolCallId, toolName, toolExecutionStart.ToolArguments);
                 ActiveAgent = agent;
-                AgentActivityEventDto? toolActivity = CreateToolCallingActivity(
-                    agent, toolName, toolCallId, toolExecutionStart.ToolArguments);
-                if (toolActivity is not null)
+                if (shouldQueueToolActivity)
                 {
-                    _pendingEvents.Enqueue(toolActivity);
+                    AgentActivityEventDto? toolActivity = CreateToolCallingActivity(
+                        agent, toolName, toolCallId, toolExecutionStart.ToolArguments);
+                    if (toolActivity is not null)
+                    {
+                        _pendingEvents.Enqueue(toolActivity);
+                    }
                 }
 
                 QueueMessageReclassifiedIfNeeded(_lastObservedMessageId);
                 break;
+            case ProviderToolExecutionProgressEvent toolExecutionProgress:
+                ActiveAgent = agent;
+                TrackToolExecutionProgress(toolExecutionProgress.ToolCallId, toolExecutionProgress.ProgressMessage);
+                break;
+            case ProviderToolExecutionPartialResultEvent toolExecutionPartialResult:
+                ActiveAgent = agent;
+                TrackToolExecutionPartialResult(toolExecutionPartialResult.ToolCallId, toolExecutionPartialResult.PartialOutput);
+                break;
+            case ProviderToolExecutionCompleteEvent toolExecutionComplete:
+                ActiveAgent = agent;
+                TrackToolExecutionComplete(toolExecutionComplete);
+                break;
             case ProviderAssistantIntentEvent intentEvent:
                 ActiveAgent = agent;
                 QueueThinkingIfNeeded(agent);
+                TrackLatestIntent(agent.AgentId, intentEvent.Intent);
                 AssistantIntentEventDto? assistantIntent = CreateAssistantIntentEvent(agent, intentEvent.Intent);
                 if (assistantIntent is not null)
                 {
@@ -174,6 +216,7 @@ internal class TurnExecutionState
             case ProviderAssistantReasoningDeltaEvent reasoningDelta:
                 ActiveAgent = agent;
                 QueueThinkingIfNeeded(agent);
+                TrackReasoningContent(reasoningDelta.ReasoningId, reasoningDelta.DeltaContent, isComplete: false);
                 ReasoningDeltaEventDto? reasoningDeltaEvent = CreateReasoningDeltaEvent(
                     agent,
                     reasoningDelta.ReasoningId,
@@ -183,6 +226,22 @@ internal class TurnExecutionState
                     _pendingEvents.Enqueue(reasoningDeltaEvent);
                 }
                 break;
+            case ProviderAssistantReasoningEvent reasoning:
+                ActiveAgent = agent;
+                TrackReasoningContent(reasoning.ReasoningId, reasoning.Content, isComplete: true);
+                break;
+            case ProviderAssistantTurnStartEvent turnStart:
+                ActiveAgent = agent;
+                CurrentProviderTurnId = turnStart.TurnId;
+                break;
+            case ProviderAssistantTurnEndEvent turnEnd:
+                ActiveAgent = agent;
+                LatestCompletedProviderTurnId = turnEnd.TurnId;
+                if (string.Equals(CurrentProviderTurnId, turnEnd.TurnId, StringComparison.Ordinal))
+                {
+                    CurrentProviderTurnId = null;
+                }
+                break;
             case ProviderSubagentStartedEvent started:
                 ActiveAgent = agent;
                 _pendingEvents.Enqueue(CreateSubagentStartedEvent(agent, started));
@@ -291,6 +350,25 @@ internal class TurnExecutionState
         return pending;
     }
 
+    public bool TryGetToolExecution(string? toolCallId, [NotNullWhen(true)] out ProviderToolExecutionSnapshot? snapshot)
+    {
+        return ToolCalls.TryGetExecution(toolCallId, out snapshot);
+    }
+
+    public bool TryGetReasoning(string? reasoningId, [NotNullWhen(true)] out ProviderReasoningSnapshot? snapshot)
+    {
+        snapshot = null;
+        return !string.IsNullOrWhiteSpace(reasoningId)
+            && _reasoningById.TryGetValue(reasoningId, out snapshot);
+    }
+
+    public bool TryGetLatestIntent(string? agentId, [NotNullWhen(true)] out string? intent)
+    {
+        intent = null;
+        return !string.IsNullOrWhiteSpace(agentId)
+            && _latestIntentByAgentId.TryGetValue(agentId, out intent);
+    }
+
     public bool TryResolveObservedAgentForMessage(string? messageId, out AgentIdentity agent)
     {
         agent = default;
@@ -311,6 +389,24 @@ internal class TurnExecutionState
         return _transcriptBuffer.AppendDelta(messageId, authorName, delta);
     }
 
+    public bool TryAppendDelta(
+        string messageId,
+        string authorName,
+        string delta,
+        out TranscriptSegment segment)
+    {
+        return _transcriptBuffer.TryAppendDelta(messageId, authorName, delta, out segment);
+    }
+
+    public bool TryFinalizeTranscriptMessage(
+        string messageId,
+        string authorName,
+        string content,
+        out TranscriptSegment segment)
+    {
+        return _transcriptBuffer.TryApplySnapshot(messageId, authorName, content, out segment);
+    }
+
     public void ClearActiveAgentIfMatching(AgentIdentity completedAgent)
     {
         if (ActiveAgent.HasValue
@@ -327,13 +423,61 @@ internal class TurnExecutionState
         _lastObservedMessageId = messageId;
     }
 
-    private void TrackToolCall(
+    private bool TrackToolCall(
         string toolCallId,
         string toolName,
         IReadOnlyDictionary<string, object?>? toolArguments)
     {
-        ToolNamesByCallId[toolCallId] = toolName;
-        ToolCallHasArgumentsById[toolCallId] = toolArguments is { Count: > 0 };
+        return ToolCalls.TryRecordToolRequest(toolCallId, toolName, toolArguments);
+    }
+
+    private void TrackToolExecutionProgress(string toolCallId, string? progressMessage)
+    {
+        ToolCalls.RecordProgress(toolCallId, progressMessage);
+    }
+
+    private void TrackToolExecutionPartialResult(string toolCallId, string? partialOutput)
+    {
+        ToolCalls.RecordPartialResult(toolCallId, partialOutput);
+    }
+
+    private void TrackToolExecutionComplete(ProviderToolExecutionCompleteEvent toolExecution)
+    {
+        ToolCalls.RecordCompletion(toolExecution);
+    }
+
+    private void TrackLatestIntent(string agentId, string? intent)
+    {
+        string? normalizedIntent = NormalizeOptionalString(intent);
+        if (normalizedIntent is null)
+        {
+            return;
+        }
+
+        _latestIntentByAgentId[agentId] = normalizedIntent;
+    }
+
+    private void TrackReasoningContent(string? reasoningId, string? content, bool isComplete)
+    {
+        string? normalizedReasoningId = NormalizeOptionalString(reasoningId);
+        if (normalizedReasoningId is null || content is null)
+        {
+            return;
+        }
+
+        _reasoningById.AddOrUpdate(
+            normalizedReasoningId,
+            id => new ProviderReasoningSnapshot
+            {
+                ReasoningId = id,
+                Content = content,
+                IsComplete = isComplete,
+            },
+            (_, existing) => existing with
+            {
+                Content = isComplete ? content : string.Concat(existing.Content, content),
+                IsComplete = isComplete || existing.IsComplete,
+            });
     }
 
     private void QueueMessageReclassifiedIfNeeded(string? messageId)
@@ -613,6 +757,24 @@ internal class TurnExecutionState
         };
     }
 
+    private TurnDeltaEventDto CreateTurnDeltaEvent(
+        string messageId,
+        string authorName,
+        string contentDelta,
+        string? content)
+    {
+        return new TurnDeltaEventDto
+        {
+            Type = "turn-delta",
+            RequestId = _command.RequestId,
+            SessionId = _command.SessionId,
+            MessageId = messageId,
+            AuthorName = authorName,
+            ContentDelta = contentDelta,
+            Content = content,
+        };
+    }
+
     private SkillInvokedEventDto CreateSkillInvokedEvent(
         AgentIdentity agent,
         ProviderSkillInvokedEvent data)
@@ -759,4 +921,9 @@ internal class TurnExecutionState
             AgentName = agent.AgentName,
         };
     }
+
+    private static string? NormalizeOptionalString(string? value)
+    {
+        return string.IsNullOrWhiteSpace(value) ? null : value.Trim();
+    }
 }

sidecar/src/Aryx.AgentHost/Services/WorkflowRequestInfoInterpreter.cs

@@ -1,4 +1,3 @@
-using System.Collections.Concurrent;
 using System.Text.Json;
 using Aryx.AgentHost.Contracts;
 using Microsoft.Agents.AI.Workflows;
@@ -20,8 +19,7 @@ internal static class WorkflowRequestInfoInterpreter
         RunTurnCommandDto command,
         RequestInfoEvent requestInfo,
         AgentIdentity? activeAgent,
-        ConcurrentDictionary<string, string> toolNamesByCallId,
-        ConcurrentDictionary<string, bool> toolCallHasArgumentsById)
+        ToolCallRegistry toolCalls)
     {
         RequestInterpretation interpretation = InterpretRequest(command, requestInfo);
         return interpretation switch
@@ -29,7 +27,7 @@ internal static class WorkflowRequestInfoInterpreter
             HandoffRequestInterpretation handoff =>
                 CreateHandoffActivity(command, handoff.TargetAgent, activeAgent),
             ToolRequestInterpretation tool when activeAgent.HasValue =>
-                CreateToolCallingActivity(command, activeAgent.Value, tool, toolNamesByCallId, toolCallHasArgumentsById),
+                CreateToolCallingActivity(command, activeAgent.Value, tool, toolCalls),
             _ => null,
         };
     }
@@ -66,22 +64,13 @@ internal static class WorkflowRequestInfoInterpreter
         RunTurnCommandDto command,
         AgentIdentity activeAgent,
         ToolRequestInterpretation tool,
-        ConcurrentDictionary<string, string> toolNamesByCallId,
-        ConcurrentDictionary<string, bool> toolCallHasArgumentsById)
+        ToolCallRegistry toolCalls)
     {
-        bool hasToolArguments = tool.ToolArguments is { Count: > 0 };
-        if (tool.ToolCallId is not null && toolNamesByCallId.ContainsKey(tool.ToolCallId))
+        if (!toolCalls.TryRecordToolRequest(tool.ToolCallId, tool.ToolName, tool.ToolArguments))
         {
-            bool trackedHasArguments = toolCallHasArgumentsById.TryGetValue(tool.ToolCallId, out bool hasTrackedArguments)
-                && hasTrackedArguments;
-            if (trackedHasArguments || !hasToolArguments)
-            {
-                return null;
-            }
+            return null;
         }
 
-        TrackToolCallId(toolNamesByCallId, toolCallHasArgumentsById, tool.ToolCallId, tool.ToolName, hasToolArguments);
-
         return new AgentActivityEventDto
         {
             Type = "agent-activity",
@@ -98,20 +87,6 @@ internal static class WorkflowRequestInfoInterpreter
         };
     }
 
-    private static void TrackToolCallId(
-        ConcurrentDictionary<string, string> toolNamesByCallId,
-        ConcurrentDictionary<string, bool> toolCallHasArgumentsById,
-        string? toolCallId,
-        string toolName,
-        bool hasToolArguments)
-    {
-        if (toolCallId is not null)
-        {
-            toolNamesByCallId[toolCallId] = toolName;
-            toolCallHasArgumentsById[toolCallId] = hasToolArguments;
-        }
-    }
-
     private static RequestInterpretation InterpretRequest(
         RunTurnCommandDto command,
         RequestInfoEvent requestInfo)

sidecar/tests/Aryx.AgentHost.Tests/CopilotEventAdapterTests.cs

@@ -0,0 +1,77 @@
+using Aryx.AgentHost.Contracts;
+using Aryx.AgentHost.Services;
+using GitHub.Copilot.SDK;
+
+namespace Aryx.AgentHost.Tests;
+
+public sealed class CopilotEventAdapterTests
+{
+    private static readonly CopilotEventAdapter Adapter = new();
+
+    [Fact]
+    public void Capabilities_AdvertiseRichTurnStreamSupport()
+    {
+        ProviderTurnStreamCapabilities capabilities = Adapter.Capabilities;
+
+        Assert.True(capabilities.SupportsIntent);
+        Assert.True(capabilities.SupportsReasoningDelta);
+        Assert.True(capabilities.SupportsReasoningBlock);
+        Assert.True(capabilities.SupportsToolExecutionProgress);
+        Assert.True(capabilities.SupportsToolExecutionPartialResult);
+        Assert.True(capabilities.SupportsToolExecutionCompletion);
+        Assert.True(capabilities.SupportsSubagentLifecycle);
+        Assert.True(capabilities.SupportsHookLifecycle);
+        Assert.True(capabilities.SupportsSessionCompaction);
+        Assert.True(capabilities.SupportsPendingMessagesMutation);
+        Assert.True(capabilities.SupportsSessionTurnBoundaries);
+    }
+
+    [Fact]
+    public void TryAdapt_ToolExecutionComplete_MapsNormalizedResult()
+    {
+        ProviderToolExecutionCompleteEvent evt = Assert.IsType<ProviderToolExecutionCompleteEvent>(
+            Adapter.TryAdapt(SessionEvent.FromJson(
+                """
+                {
+                  "type": "tool.execution_complete",
+                  "data": {
+                    "toolCallId": "tool-call-1",
+                    "success": true,
+                    "result": {
+                      "content": "summary",
+                      "detailedContent": "summary\nfull"
+                    }
+                  },
+                  "id": "11111111-2222-3333-4444-555555555555",
+                  "timestamp": "2026-03-27T00:00:00Z"
+                }
+                """)));
+
+        Assert.Equal("tool-call-1", evt.ToolCallId);
+        Assert.True(evt.Success);
+        Assert.Equal("summary", evt.ResultContent);
+        Assert.Equal("summary\nfull", evt.DetailedResultContent);
+        Assert.Null(evt.Error);
+    }
+
+    [Fact]
+    public void TryAdapt_AssistantReasoning_MapsCompletedReasoningBlock()
+    {
+        ProviderAssistantReasoningEvent evt = Assert.IsType<ProviderAssistantReasoningEvent>(
+            Adapter.TryAdapt(SessionEvent.FromJson(
+                """
+                {
+                  "type": "assistant.reasoning",
+                  "data": {
+                    "reasoningId": "reasoning-1",
+                    "content": "Planning the next step."
+                  },
+                  "id": "66666666-7777-8888-9999-aaaaaaaaaaaa",
+                  "timestamp": "2026-03-27T00:00:00Z"
+                }
+                """)));
+
+        Assert.Equal("reasoning-1", evt.ReasoningId);
+        Assert.Equal("Planning the next step.", evt.Content);
+    }
+}

sidecar/tests/Aryx.AgentHost.Tests/CopilotTurnExecutionStateTests.cs

@@ -110,10 +110,9 @@ public sealed class CopilotTurnExecutionStateTests
         Assert.Equal("tool-call-1", toolActivity.ToolCallId);
         Assert.NotNull(toolActivity.ToolArguments);
         Assert.Equal("/src/main.ts", toolActivity.ToolArguments["path"]);
-        Assert.True(state.ToolNamesByCallId.TryGetValue("tool-call-1", out string? toolName));
+        Assert.True(state.ToolCalls.TryGetToolName("tool-call-1", out string? toolName));
         Assert.Equal("view", toolName);
-        Assert.True(state.ToolCallHasArgumentsById.TryGetValue("tool-call-1", out bool hasArguments));
-        Assert.True(hasArguments);
+        Assert.True(state.ToolCalls.HasTrackedArguments("tool-call-1"));
     }
 
     [Fact]
@@ -129,8 +128,115 @@ public sealed class CopilotTurnExecutionStateTests
 
         AgentActivityEventDto toolActivity = Assert.Single(state.DrainPendingEvents().OfType<AgentActivityEventDto>());
         Assert.Null(toolActivity.ToolArguments);
-        Assert.True(state.ToolCallHasArgumentsById.TryGetValue("tool-call-1", out bool hasArguments));
-        Assert.False(hasArguments);
+        Assert.False(state.ToolCalls.HasTrackedArguments("tool-call-1"));
+    }
+
+    [Fact]
+    public void ObserveSessionEvent_ToolExecutionProgress_TracksLatestProgressMessage()
+    {
+        RunTurnCommandDto command = CreateCommand();
+        CopilotTurnExecutionState state = new(command);
+
+        state.ObserveSessionEvent(
+            command.Workflow.GetAgentNodes()[0],
+            SessionEvent.FromJson(
+                """{"type":"tool.execution_start","data":{"toolCallId":"tool-call-1","toolName":"view"},"id":"33333333-3333-3333-3333-333333333333","timestamp":"2026-03-27T00:00:00Z"}"""));
+        _ = state.DrainPendingEvents();
+
+        state.ObserveSessionEvent(
+            command.Workflow.GetAgentNodes()[0],
+            SessionEvent.FromJson(
+                """{"type":"tool.execution_progress","data":{"toolCallId":"tool-call-1","progressMessage":"Scanning repository"},"id":"43333333-3333-3333-3333-333333333333","timestamp":"2026-03-27T00:00:01Z"}"""));
+
+        Assert.True(state.TryGetToolExecution("tool-call-1", out ProviderToolExecutionSnapshot? toolExecution));
+        Assert.NotNull(toolExecution);
+        Assert.Equal(ProviderToolExecutionStatus.Running, toolExecution.Status);
+        Assert.Equal("view", toolExecution.ToolName);
+        Assert.Equal("Scanning repository", toolExecution.LatestProgressMessage);
+    }
+
+    [Fact]
+    public void ObserveSessionEvent_ToolExecutionPartialResult_AppendsPartialOutput()
+    {
+        RunTurnCommandDto command = CreateCommand();
+        CopilotTurnExecutionState state = new(command);
+
+        state.ObserveSessionEvent(
+            command.Workflow.GetAgentNodes()[0],
+            SessionEvent.FromJson(
+                """{"type":"tool.execution_start","data":{"toolCallId":"tool-call-1","toolName":"bash"},"id":"53333333-3333-3333-3333-333333333333","timestamp":"2026-03-27T00:00:00Z"}"""));
+        _ = state.DrainPendingEvents();
+
+        state.ObserveSessionEvent(
+            command.Workflow.GetAgentNodes()[0],
+            SessionEvent.FromJson(
+                """{"type":"tool.execution_partial_result","data":{"toolCallId":"tool-call-1","partialOutput":"first line\n"},"id":"63333333-3333-3333-3333-333333333333","timestamp":"2026-03-27T00:00:01Z"}"""));
+        state.ObserveSessionEvent(
+            command.Workflow.GetAgentNodes()[0],
+            SessionEvent.FromJson(
+                """{"type":"tool.execution_partial_result","data":{"toolCallId":"tool-call-1","partialOutput":"second line"},"id":"73333333-3333-3333-3333-333333333333","timestamp":"2026-03-27T00:00:02Z"}"""));
+
+        Assert.True(state.TryGetToolExecution("tool-call-1", out ProviderToolExecutionSnapshot? toolExecution));
+        Assert.NotNull(toolExecution);
+        Assert.Equal("first line\nsecond line", toolExecution.PartialOutput);
+    }
+
+    [Fact]
+    public void ObserveSessionEvent_ToolExecutionComplete_TracksFinalToolState()
+    {
+        RunTurnCommandDto command = CreateCommand();
+        CopilotTurnExecutionState state = new(command);
+
+        state.ObserveSessionEvent(
+            command.Workflow.GetAgentNodes()[0],
+            SessionEvent.FromJson(
+                """{"type":"tool.execution_start","data":{"toolCallId":"tool-call-1","toolName":"view","arguments":{"path":"README.md"}},"id":"83333333-3333-3333-3333-333333333333","timestamp":"2026-03-27T00:00:00Z"}"""));
+        _ = state.DrainPendingEvents();
+
+        state.ObserveSessionEvent(
+            command.Workflow.GetAgentNodes()[0],
+            SessionEvent.FromJson(
+                """
+                {
+                  "type": "tool.execution_complete",
+                  "data": {
+                    "toolCallId": "tool-call-1",
+                    "success": true,
+                    "result": {
+                      "content": "README excerpt",
+                      "detailedContent": "README excerpt\nwith more detail"
+                    }
+                  },
+                  "id": "93333333-3333-3333-3333-333333333333",
+                  "timestamp": "2026-03-27T00:00:01Z"
+                }
+                """));
+
+        Assert.True(state.TryGetToolExecution("tool-call-1", out ProviderToolExecutionSnapshot? toolExecution));
+        Assert.NotNull(toolExecution);
+        Assert.Equal(ProviderToolExecutionStatus.Completed, toolExecution.Status);
+        Assert.Equal("view", toolExecution.ToolName);
+        Assert.NotNull(toolExecution.ToolArguments);
+        Assert.Equal("README excerpt", toolExecution.ResultContent);
+        Assert.Equal("README excerpt\nwith more detail", toolExecution.DetailedResultContent);
+        Assert.Null(toolExecution.Error);
+    }
+
+    [Fact]
+    public void ObserveSessionEvent_ToolExecutionCompleteFailure_TracksErrorState()
+    {
+        RunTurnCommandDto command = CreateCommand();
+        CopilotTurnExecutionState state = new(command);
+
+        state.ObserveSessionEvent(
+            command.Workflow.GetAgentNodes()[0],
+            SessionEvent.FromJson(
+                """{"type":"tool.execution_complete","data":{"toolCallId":"tool-call-err","success":false,"error":{"message":"permission denied"}},"id":"a3333333-3333-3333-3333-333333333333","timestamp":"2026-03-27T00:00:01Z"}"""));
+
+        Assert.True(state.TryGetToolExecution("tool-call-err", out ProviderToolExecutionSnapshot? toolExecution));
+        Assert.NotNull(toolExecution);
+        Assert.Equal(ProviderToolExecutionStatus.Failed, toolExecution.Status);
+        Assert.Equal("permission denied", toolExecution.Error);
     }
 
     [Fact]
@@ -145,10 +251,9 @@ public sealed class CopilotTurnExecutionStateTests
                 """{"type":"tool.execution_start","data":{"toolCallId":"tool-call-1","toolName":"handoff_to_specialist"},"id":"1ce9d1dc-68f1-4df5-9728-f97017233279","timestamp":"2026-03-27T00:00:00Z"}"""));
 
         Assert.Empty(state.DrainPendingEvents().OfType<AgentActivityEventDto>());
-        Assert.True(state.ToolNamesByCallId.TryGetValue("tool-call-1", out string? toolName));
+        Assert.True(state.ToolCalls.TryGetToolName("tool-call-1", out string? toolName));
         Assert.Equal("handoff_to_specialist", toolName);
-        Assert.True(state.ToolCallHasArgumentsById.TryGetValue("tool-call-1", out bool hasArguments));
-        Assert.False(hasArguments);
+        Assert.False(state.ToolCalls.HasTrackedArguments("tool-call-1"));
     }
 
     [Fact]
@@ -267,14 +372,12 @@ public sealed class CopilotTurnExecutionStateTests
         Assert.Contains(toolActivities, activity => activity.ToolCallId == "tool-call-2" && activity.ToolName == "view");
         MessageReclassifiedEventDto reclassified = Assert.Single(pending.OfType<MessageReclassifiedEventDto>());
         Assert.Equal("msg-3", reclassified.MessageId);
-        Assert.True(state.ToolNamesByCallId.TryGetValue("tool-call-1", out string? firstToolName));
+        Assert.True(state.ToolCalls.TryGetToolName("tool-call-1", out string? firstToolName));
         Assert.Equal("rg", firstToolName);
-        Assert.True(state.ToolNamesByCallId.TryGetValue("tool-call-2", out string? secondToolName));
+        Assert.True(state.ToolCalls.TryGetToolName("tool-call-2", out string? secondToolName));
         Assert.Equal("view", secondToolName);
-        Assert.True(state.ToolCallHasArgumentsById.TryGetValue("tool-call-1", out bool firstHasArguments));
-        Assert.False(firstHasArguments);
-        Assert.True(state.ToolCallHasArgumentsById.TryGetValue("tool-call-2", out bool secondHasArguments));
-        Assert.False(secondHasArguments);
+        Assert.False(state.ToolCalls.HasTrackedArguments("tool-call-1"));
+        Assert.False(state.ToolCalls.HasTrackedArguments("tool-call-2"));
     }
 
     [Fact]
@@ -366,6 +469,9 @@ public sealed class CopilotTurnExecutionStateTests
         Assert.Equal("session-1", intent.SessionId);
         Assert.Equal("agent-1", intent.AgentId);
         Assert.Equal("Searching incident playbooks", intent.Intent);
+        Assert.True(state.TryGetLatestIntent("agent-1", out string? latestIntent));
+        Assert.NotNull(latestIntent);
+        Assert.Equal("Searching incident playbooks", latestIntent);
     }
 
     [Fact]
@@ -399,6 +505,93 @@ public sealed class CopilotTurnExecutionStateTests
         Assert.Equal("agent-1", reasoning.AgentId);
         Assert.Equal("reasoning-2", reasoning.ReasoningId);
         Assert.Equal("Searching logs.", reasoning.ContentDelta);
+        Assert.True(state.TryGetReasoning("reasoning-2", out ProviderReasoningSnapshot? reasoningState));
+        Assert.NotNull(reasoningState);
+        Assert.Equal("Searching logs.", reasoningState.Content);
+        Assert.False(reasoningState.IsComplete);
+    }
+
+    [Fact]
+    public void ObserveSessionEvent_AssistantReasoning_TracksCompletedReasoningBlock()
+    {
+        RunTurnCommandDto command = CreateCommand();
+        CopilotTurnExecutionState state = new(command);
+
+        state.ObserveSessionEvent(
+            command.Workflow.GetAgentNodes()[0],
+            SessionEvent.FromJson(
+                """
+                {
+                  "type": "assistant.reasoning_delta",
+                  "data": {
+                    "reasoningId": "reasoning-3",
+                    "deltaContent": "Planning."
+                  },
+                  "id": "cd269258-5e5d-46b6-bf3f-bd8cba793b1a",
+                  "timestamp": "2026-03-27T00:00:00Z"
+                }
+                """));
+        _ = state.DrainPendingEvents();
+
+        state.ObserveSessionEvent(
+            command.Workflow.GetAgentNodes()[0],
+            SessionEvent.FromJson(
+                """
+                {
+                  "type": "assistant.reasoning",
+                  "data": {
+                    "reasoningId": "reasoning-3",
+                    "content": "Planning. Checking logs."
+                  },
+                  "id": "dd269258-5e5d-46b6-bf3f-bd8cba793b1a",
+                  "timestamp": "2026-03-27T00:00:01Z"
+                }
+                """));
+
+        Assert.True(state.TryGetReasoning("reasoning-3", out ProviderReasoningSnapshot? reasoning));
+        Assert.NotNull(reasoning);
+        Assert.Equal("Planning. Checking logs.", reasoning.Content);
+        Assert.True(reasoning.IsComplete);
+    }
+
+    [Fact]
+    public void ObserveSessionEvent_AssistantTurnBoundaries_TrackProviderTurnIds()
+    {
+        RunTurnCommandDto command = CreateCommand();
+        CopilotTurnExecutionState state = new(command);
+
+        state.ObserveSessionEvent(
+            command.Workflow.GetAgentNodes()[0],
+            SessionEvent.FromJson(
+                """
+                {
+                  "type": "assistant.turn_start",
+                  "data": {
+                    "turnId": "turn-sdk-1"
+                  },
+                  "id": "ed269258-5e5d-46b6-bf3f-bd8cba793b1a",
+                  "timestamp": "2026-03-27T00:00:00Z"
+                }
+                """));
+
+        Assert.Equal("turn-sdk-1", state.CurrentProviderTurnId);
+
+        state.ObserveSessionEvent(
+            command.Workflow.GetAgentNodes()[0],
+            SessionEvent.FromJson(
+                """
+                {
+                  "type": "assistant.turn_end",
+                  "data": {
+                    "turnId": "turn-sdk-1"
+                  },
+                  "id": "fd269258-5e5d-46b6-bf3f-bd8cba793b1a",
+                  "timestamp": "2026-03-27T00:00:01Z"
+                }
+                """));
+
+        Assert.Null(state.CurrentProviderTurnId);
+        Assert.Equal("turn-sdk-1", state.LatestCompletedProviderTurnId);
     }
 
     [Fact]
@@ -654,6 +847,53 @@ public sealed class CopilotTurnExecutionStateTests
         Assert.Equal("agent-1", evt.AgentId);
     }
 
+    [Fact]
+    public void ObserveSessionEvent_AssistantMessage_FinalizesTranscriptAndSuppressesLateDeltas()
+    {
+        RunTurnCommandDto command = CreateCommand();
+        CopilotTurnExecutionState state = new(command);
+
+        Assert.True(state.TryAppendDelta("msg-final", "Primary", "Draft response", out TranscriptSegment streamed));
+        Assert.False(streamed.IsFinalized);
+
+        state.ObserveSessionEvent(
+            command.Workflow.GetAgentNodes()[0],
+            SessionEvent.FromJson(
+                """
+                {
+                  "type": "assistant.message",
+                  "data": {
+                    "messageId": "msg-final",
+                    "content": "Provider final response"
+                  },
+                  "id": "12121212-1212-1212-1212-121212121212",
+                  "timestamp": "2026-03-27T00:00:00Z"
+                }
+                """));
+
+        TurnDeltaEventDto correction = Assert.Single(state.DrainPendingEvents().OfType<TurnDeltaEventDto>());
+        Assert.Equal("msg-final", correction.MessageId);
+        Assert.Equal("Primary", correction.AuthorName);
+        Assert.Equal(string.Empty, correction.ContentDelta);
+        Assert.Equal("Provider final response", correction.Content);
+
+        Assert.False(state.TryAppendDelta("msg-final", "Primary", " late delta", out TranscriptSegment unchanged));
+        Assert.True(unchanged.IsFinalized);
+        Assert.Equal("Provider final response", unchanged.Content);
+
+        ChatMessage output = new(ChatRole.Assistant, "Workflow wording")
+        {
+            MessageId = "msg-final",
+            AuthorName = "assistant",
+        };
+
+        state.UpdateCompletedMessages([output], []);
+        ChatMessageDto completed = Assert.Single(state.FinalizeCompletedMessages());
+        Assert.Equal("msg-final", completed.Id);
+        Assert.Equal("Primary", completed.AuthorName);
+        Assert.Equal("Provider final response", completed.Content);
+    }
+
     private static SessionEvent CreateHookStartEvent()
     {
         return SessionEvent.FromJson(

sidecar/tests/Aryx.AgentHost.Tests/CopilotWorkflowRunnerTests.cs

@@ -451,6 +451,50 @@ public sealed class CopilotWorkflowRunnerTests
             });
     }
 
+    [Fact]
+    public void ProjectCompletedMessages_UsesExactMessageIdMatchBeforeFallbackHeuristics()
+    {
+        RunTurnCommandDto command = CreateCommand(
+            "group-chat",
+            CreateAgent(id: "agent-group-writer", name: "Writer"),
+            CreateAgent(id: "agent-group-reviewer", name: "Reviewer"));
+
+        IReadOnlyList<ChatMessageDto> messages = WorkflowTranscriptProjector.ProjectCompletedMessagesFromSegments(
+            command,
+            [
+                new ChatMessage(ChatRole.Assistant, "Revised draft with cleaner wording.")
+                {
+                    AuthorName = "assistant",
+                    MessageId = "msg-writer-2",
+                },
+                new ChatMessage(ChatRole.Assistant, "Review feedback with cleaner wording.")
+                {
+                    AuthorName = "assistant",
+                    MessageId = "msg-reviewer-1",
+                },
+            ],
+            [
+                new TranscriptSegment("msg-writer-1", "Writer", "Initial draft."),
+                new TranscriptSegment("msg-reviewer-1", "Reviewer", "Review feedback with draft wording."),
+                new TranscriptSegment("msg-writer-2", "Writer", "Revised draft with draft wording."),
+            ]);
+
+        Assert.Collection(
+            messages,
+            writer =>
+            {
+                Assert.Equal("msg-writer-2", writer.Id);
+                Assert.Equal("Writer", writer.AuthorName);
+                Assert.Equal("Revised draft with cleaner wording.", writer.Content);
+            },
+            reviewer =>
+            {
+                Assert.Equal("msg-reviewer-1", reviewer.Id);
+                Assert.Equal("Reviewer", reviewer.AuthorName);
+                Assert.Equal("Review feedback with cleaner wording.", reviewer.Content);
+            });
+    }
+
     [Fact]
     public void ProjectCompletedMessages_UsesFallbackAgentForGenericAssistantOutput()
     {
@@ -531,6 +575,36 @@ public sealed class CopilotWorkflowRunnerTests
         Assert.Equal("Done — GoogleClient.cs now contains the requested class with cleaned formatting.", message.Content);
     }
 
+    [Fact]
+    public void ProjectCompletedMessages_PrefersFinalizedSegmentContentOverWorkflowOutput()
+    {
+        RunTurnCommandDto command = CreateCommand(
+            "single",
+            CreateAgent(id: "agent-single-primary", name: "Primary Agent"));
+
+        IReadOnlyList<ChatMessageDto> messages = WorkflowTranscriptProjector.ProjectCompletedMessagesFromSegments(
+            command,
+            [
+                new ChatMessage(ChatRole.Assistant, "Workflow wording that arrived later.")
+                {
+                    AuthorName = "assistant",
+                    MessageId = "msg-1",
+                },
+            ],
+            [
+                new TranscriptSegment(
+                    "msg-1",
+                    "Primary Agent",
+                    "Provider final wording that should win.",
+                    IsFinalized: true),
+            ]);
+
+        ChatMessageDto message = Assert.Single(messages);
+        Assert.Equal("msg-1", message.Id);
+        Assert.Equal("Primary Agent", message.AuthorName);
+        Assert.Equal("Provider final wording that should win.", message.Content);
+    }
+
     [Fact]
     public void ProjectCompletedMessages_DropsBlankAssistantOutputMessages()
     {
@@ -602,7 +676,22 @@ public sealed class CopilotWorkflowRunnerTests
                  Assert.Equal("msg-2", second.MessageId);
                  Assert.Equal("Implementer", second.AuthorName);
                  Assert.Equal("B", second.Content);
-             });
+              });
+    }
+
+    [Fact]
+    public void StreamingTranscriptBuffer_IgnoresLateDeltasAfterFinalSnapshot()
+    {
+        StreamingTranscriptBuffer buffer = new();
+
+        buffer.AppendDelta("msg-1", "Architect", "Draft");
+        Assert.True(buffer.TryApplySnapshot("msg-1", "Architect", "Final", out TranscriptSegment finalized));
+        Assert.True(finalized.IsFinalized);
+        Assert.Equal("Final", finalized.Content);
+
+        Assert.False(buffer.TryAppendDelta("msg-1", "Architect", " late delta", out TranscriptSegment unchanged));
+        Assert.True(unchanged.IsFinalized);
+        Assert.Equal("Final", unchanged.Content);
     }
 
     [Fact]
@@ -776,8 +865,165 @@ public sealed class CopilotWorkflowRunnerTests
         Assert.Equal("tool-call-1", activity.ToolCallId);
         Assert.NotNull(activity.ToolArguments);
         Assert.Equal(@"C:\workspace\README.md", activity.ToolArguments["path"]);
-        Assert.True(state.ToolCallHasArgumentsById.TryGetValue("tool-call-1", out bool hasArguments));
-        Assert.True(hasArguments);
+        Assert.True(state.ToolCalls.HasTrackedArguments("tool-call-1"));
+    }
+
+    [Fact]
+    public async Task ObserveSessionEvent_ToolExecutionStart_DoesNotDuplicateTrackedRequestInfoActivity()
+    {
+        RunTurnCommandDto command = CreateApprovalCommand();
+        CopilotTurnExecutionState state = new(command);
+        WorkflowNodeDto agent = CreateAgent("agent-1", "Primary");
+        state.ObserveSessionEvent(
+            agent,
+            SessionEvent.FromJson(
+                """
+                {
+                  "type": "assistant.message_delta",
+                  "data": {
+                    "messageId": "msg-1",
+                    "deltaContent": "Inspecting"
+                  },
+                  "id": "b61652d1-120e-4a9f-8f0e-1dbf04fb18da",
+                  "timestamp": "2026-03-27T00:00:00Z"
+                }
+                """));
+        _ = state.DrainPendingEvents();
+
+        RequestInfoEvent requestInfo = CreateRequestInfoEvent(
+            new FunctionCallContent("tool-call-1", "view", new Dictionary<string, object?>
+            {
+                ["path"] = @"C:\workspace\README.md",
+            }));
+        List<AgentActivityEventDto> requestActivities = [];
+
+        MethodInfo handleWorkflowEvent = typeof(CopilotWorkflowRunner).GetMethod(
+            "HandleWorkflowEventAsync",
+            BindingFlags.NonPublic | BindingFlags.Static)!;
+        Task<bool> handleTask = (Task<bool>)handleWorkflowEvent.Invoke(
+            null,
+            [
+                command,
+                requestInfo,
+                Array.Empty<ChatMessage>(),
+                state,
+                (Func<TurnDeltaEventDto, Task>)(_ => Task.CompletedTask),
+                (Func<SidecarEventDto, Task>)(sidecarEvent =>
+                {
+                    requestActivities.Add(Assert.IsType<AgentActivityEventDto>(sidecarEvent));
+                    return Task.CompletedTask;
+                }),
+            ])!;
+
+        bool shouldEndTurn = await handleTask;
+
+        Assert.False(shouldEndTurn);
+        AgentActivityEventDto requestActivity = Assert.Single(requestActivities);
+        Assert.Equal("tool-calling", requestActivity.ActivityType);
+        Assert.True(state.ToolCalls.HasTrackedArguments("tool-call-1"));
+
+        state.ObserveSessionEvent(
+            agent,
+            SessionEvent.FromJson(
+                """
+                {
+                  "type": "tool.execution_start",
+                  "data": {
+                    "toolCallId": "tool-call-1",
+                    "toolName": "view",
+                    "arguments": {
+                      "path": "C:\\workspace\\README.md"
+                    }
+                  },
+                  "id": "c61652d1-120e-4a9f-8f0e-1dbf04fb18da",
+                  "timestamp": "2026-03-27T00:00:01Z"
+                }
+                """));
+
+        IReadOnlyList<SidecarEventDto> pending = state.DrainPendingEvents();
+        Assert.DoesNotContain(
+            pending.OfType<AgentActivityEventDto>(),
+            activity => activity.ActivityType == "tool-calling");
+
+        MessageReclassifiedEventDto reclassified = Assert.Single(pending.OfType<MessageReclassifiedEventDto>());
+        Assert.Equal("msg-1", reclassified.MessageId);
+    }
+
+    [Fact]
+    public async Task ObserveSessionEvent_ToolExecutionStart_EmitsEnrichmentWhenRequestInfoWasMissingArguments()
+    {
+        RunTurnCommandDto command = CreateApprovalCommand();
+        CopilotTurnExecutionState state = new(command);
+        WorkflowNodeDto agent = CreateAgent("agent-1", "Primary");
+        state.ObserveSessionEvent(
+            agent,
+            SessionEvent.FromJson(
+                """
+                {
+                  "type": "assistant.message_delta",
+                  "data": {
+                    "messageId": "msg-2",
+                    "deltaContent": "Inspecting"
+                  },
+                  "id": "d61652d1-120e-4a9f-8f0e-1dbf04fb18da",
+                  "timestamp": "2026-03-27T00:00:00Z"
+                }
+                """));
+        _ = state.DrainPendingEvents();
+
+        RequestInfoEvent requestInfo = CreateRequestInfoEvent(
+            new FunctionCallContent("tool-call-1", "view", new Dictionary<string, object?>()));
+        List<AgentActivityEventDto> requestActivities = [];
+
+        MethodInfo handleWorkflowEvent = typeof(CopilotWorkflowRunner).GetMethod(
+            "HandleWorkflowEventAsync",
+            BindingFlags.NonPublic | BindingFlags.Static)!;
+        Task<bool> handleTask = (Task<bool>)handleWorkflowEvent.Invoke(
+            null,
+            [
+                command,
+                requestInfo,
+                Array.Empty<ChatMessage>(),
+                state,
+                (Func<TurnDeltaEventDto, Task>)(_ => Task.CompletedTask),
+                (Func<SidecarEventDto, Task>)(sidecarEvent =>
+                {
+                    requestActivities.Add(Assert.IsType<AgentActivityEventDto>(sidecarEvent));
+                    return Task.CompletedTask;
+                }),
+            ])!;
+
+        bool shouldEndTurn = await handleTask;
+
+        Assert.False(shouldEndTurn);
+        AgentActivityEventDto requestActivity = Assert.Single(requestActivities);
+        Assert.Null(requestActivity.ToolArguments);
+        Assert.False(state.ToolCalls.HasTrackedArguments("tool-call-1"));
+
+        state.ObserveSessionEvent(
+            agent,
+            SessionEvent.FromJson(
+                """
+                {
+                  "type": "tool.execution_start",
+                  "data": {
+                    "toolCallId": "tool-call-1",
+                    "toolName": "view",
+                    "arguments": {
+                      "path": "C:\\workspace\\README.md"
+                    }
+                  },
+                  "id": "e61652d1-120e-4a9f-8f0e-1dbf04fb18da",
+                  "timestamp": "2026-03-27T00:00:01Z"
+                }
+                """));
+
+        AgentActivityEventDto enrichment = Assert.Single(
+            state.DrainPendingEvents().OfType<AgentActivityEventDto>(),
+            activity => activity.ActivityType == "tool-calling");
+        Assert.NotNull(enrichment.ToolArguments);
+        Assert.Equal(@"C:\workspace\README.md", enrichment.ToolArguments["path"]);
+        Assert.True(state.ToolCalls.HasTrackedArguments("tool-call-1"));
     }
 
     [Fact]
@@ -1372,14 +1618,12 @@ public sealed class CopilotWorkflowRunnerTests
     [Fact]
     public void TryGetApprovalToolName_UsesToolCallLookupForPermissionCategoriesWithoutDirectToolNames()
     {
-        Dictionary<string, string> toolNamesByCallId = new(StringComparer.Ordinal)
-        {
-            ["tool-call-url"] = "web_fetch",
-            ["tool-call-shell"] = "shell",
-            ["tool-call-read"] = "view",
-            ["tool-call-write"] = "write_file",
-            ["tool-call-memory"] = "store_memory",
-        };
+        ToolCallRegistry toolCalls = CreateToolCallRegistry(
+            ("tool-call-url", "web_fetch"),
+            ("tool-call-shell", "shell"),
+            ("tool-call-read", "view"),
+            ("tool-call-write", "write_file"),
+            ("tool-call-memory", "store_memory"));
 
         Assert.True(
             CopilotApprovalCoordinator.TryGetApprovalToolName(
@@ -1390,7 +1634,7 @@ public sealed class CopilotWorkflowRunnerTests
                     Intention = "Fetch the requested page",
                     Url = "https://example.com/docs",
                 },
-                toolNamesByCallId,
+                toolCalls,
                 out string? urlToolName));
         Assert.Equal("web_fetch", urlToolName);
 
@@ -1408,7 +1652,7 @@ public sealed class CopilotWorkflowRunnerTests
                     HasWriteFileRedirection = false,
                     CanOfferSessionApproval = false,
                 },
-                toolNamesByCallId,
+                toolCalls,
                 out string? shellToolName));
         Assert.Equal("shell", shellToolName);
 
@@ -1421,7 +1665,7 @@ public sealed class CopilotWorkflowRunnerTests
                     Intention = "Inspect a file",
                     Path = "README.md",
                 },
-                toolNamesByCallId,
+                toolCalls,
                 out string? readToolName));
         Assert.Equal("view", readToolName);
 
@@ -1435,7 +1679,7 @@ public sealed class CopilotWorkflowRunnerTests
                     FileName = "README.md",
                     Diff = "@@ -1 +1 @@",
                 },
-                toolNamesByCallId,
+                toolCalls,
                 out string? writeToolName));
         Assert.Equal("write_file", writeToolName);
 
@@ -1449,7 +1693,7 @@ public sealed class CopilotWorkflowRunnerTests
                     Fact = "Use Bun for script execution.",
                     Citations = "package.json",
                 },
-                toolNamesByCallId,
+                toolCalls,
                 out string? memoryToolName));
         Assert.Equal("store_memory", memoryToolName);
     }
@@ -1960,7 +2204,7 @@ public sealed class CopilotWorkflowRunnerTests
             {
                 SessionId = "copilot-session-1",
             },
-            new Dictionary<string, string>(StringComparer.Ordinal),
+            CreateToolCallRegistry(),
             approval =>
             {
                 observedApproval = approval;
@@ -2007,10 +2251,7 @@ public sealed class CopilotWorkflowRunnerTests
             {
                 SessionId = "copilot-session-1",
             },
-            new Dictionary<string, string>(StringComparer.Ordinal)
-            {
-                ["tool-call-write-1"] = "apply_patch",
-            },
+            CreateToolCallRegistry(("tool-call-write-1", "apply_patch")),
             activity =>
             {
                 observedActivity = activity;
@@ -2067,7 +2308,7 @@ public sealed class CopilotWorkflowRunnerTests
             {
                 SessionId = "copilot-session-1",
             },
-            new Dictionary<string, string>(StringComparer.Ordinal),
+            CreateToolCallRegistry(),
             approval =>
             {
                 sawApproval = true;
@@ -2104,7 +2345,7 @@ public sealed class CopilotWorkflowRunnerTests
             {
                 SessionId = "copilot-session-1",
             },
-            new Dictionary<string, string>(StringComparer.Ordinal),
+            CreateToolCallRegistry(),
             approval =>
             {
                 sawApproval = true;
@@ -2137,10 +2378,7 @@ public sealed class CopilotWorkflowRunnerTests
             {
                 SessionId = "copilot-session-1",
             },
-            new Dictionary<string, string>(StringComparer.Ordinal)
-            {
-                ["tool-call-read-1"] = "view",
-            },
+            CreateToolCallRegistry(("tool-call-read-1", "view")),
             approval =>
             {
                 firstApproval = approval;
@@ -2178,10 +2416,7 @@ public sealed class CopilotWorkflowRunnerTests
             {
                 SessionId = "copilot-session-1",
             },
-            new Dictionary<string, string>(StringComparer.Ordinal)
-            {
-                ["tool-call-read-2"] = "grep",
-            },
+            CreateToolCallRegistry(("tool-call-read-2", "grep")),
             approval =>
             {
                 sawSecondApproval = true;
@@ -2214,10 +2449,7 @@ public sealed class CopilotWorkflowRunnerTests
             {
                 SessionId = "copilot-session-1",
             },
-            new Dictionary<string, string>(StringComparer.Ordinal)
-            {
-                ["tool-call-read-1"] = "view",
-            },
+            CreateToolCallRegistry(("tool-call-read-1", "view")),
             approval =>
             {
                 firstApproval = approval;
@@ -2254,10 +2486,7 @@ public sealed class CopilotWorkflowRunnerTests
             {
                 SessionId = "copilot-session-1",
             },
-            new Dictionary<string, string>(StringComparer.Ordinal)
-            {
-                ["tool-call-read-2"] = "grep",
-            },
+            CreateToolCallRegistry(("tool-call-read-2", "grep")),
             approval =>
             {
                 secondApproval = approval;
@@ -2548,6 +2777,17 @@ public sealed class CopilotWorkflowRunnerTests
         };
     }
 
+    private static ToolCallRegistry CreateToolCallRegistry(params (string ToolCallId, string ToolName)[] toolCalls)
+    {
+        ToolCallRegistry registry = new();
+        foreach ((string toolCallId, string toolName) in toolCalls)
+        {
+            registry.RecordToolStart(toolCallId, toolName, toolArguments: null);
+        }
+
+        return registry;
+    }
+
     private static RunTurnCommandDto CreateRequestPortCommand()
     {
         return new RunTurnCommandDto

sidecar/tests/Aryx.AgentHost.Tests/WorkflowRequestInfoInterpreterTests.cs

@@ -1,5 +1,4 @@
 using System.Collections;
-using System.Collections.Concurrent;
 using System.Runtime.CompilerServices;
 using System.Text.Json;
 using Aryx.AgentHost.Contracts;
@@ -27,8 +26,7 @@ public sealed class WorkflowRequestInfoInterpreterTests
             CreateSingleAgentCommand(),
             requestInfo,
             new AgentIdentity("agent-1", "Primary"),
-            tracking.ToolNamesByCallId,
-            tracking.ToolCallHasArgumentsById);
+            tracking);
 
         Assert.NotNull(activity);
         Assert.Equal("tool-calling", activity.ActivityType);
@@ -38,8 +36,9 @@ public sealed class WorkflowRequestInfoInterpreterTests
         Assert.NotNull(activity.ToolArguments);
         Assert.Equal(@"C:\workspace\file.txt", activity.ToolArguments["path"]);
         Assert.Equal([10, 25], Assert.IsAssignableFrom<IReadOnlyList<object?>>(activity.ToolArguments["viewRange"]));
-        Assert.Equal("view", tracking.ToolNamesByCallId["call-1"]);
-        Assert.True(tracking.ToolCallHasArgumentsById["call-1"]);
+        Assert.True(tracking.TryGetToolName("call-1", out string? toolName));
+        Assert.Equal("view", toolName);
+        Assert.True(tracking.HasTrackedArguments("call-1"));
     }
 
     [Fact]
@@ -61,8 +60,7 @@ public sealed class WorkflowRequestInfoInterpreterTests
             CreateSingleAgentCommand(),
             requestInfo,
             new AgentIdentity("agent-1", "Primary"),
-            tracking.ToolNamesByCallId,
-            tracking.ToolCallHasArgumentsById);
+            tracking);
 
         Assert.NotNull(activity);
         Assert.Equal("tool-calling", activity.ActivityType);
@@ -70,8 +68,9 @@ public sealed class WorkflowRequestInfoInterpreterTests
         Assert.NotNull(activity.ToolArguments);
         Assert.Equal(@"C:\workspace", activity.ToolArguments["path"]);
         Assert.Equal(true, activity.ToolArguments["includeIgnored"]);
-        Assert.Equal("git.status", tracking.ToolNamesByCallId["call-1"]);
-        Assert.True(tracking.ToolCallHasArgumentsById["call-1"]);
+        Assert.True(tracking.TryGetToolName("call-1", out string? toolName));
+        Assert.Equal("git.status", toolName);
+        Assert.True(tracking.HasTrackedArguments("call-1"));
     }
 
     [Fact]
@@ -85,8 +84,7 @@ public sealed class WorkflowRequestInfoInterpreterTests
             CreateSingleAgentCommand(),
             requestInfo,
             new AgentIdentity("agent-1", "Primary"),
-            tracking.ToolNamesByCallId,
-            tracking.ToolCallHasArgumentsById);
+            tracking);
 
         Assert.NotNull(activity);
         Assert.Equal("tool-calling", activity.ActivityType);
@@ -95,8 +93,9 @@ public sealed class WorkflowRequestInfoInterpreterTests
         Assert.Equal(
             ["print('hello')"],
             Assert.IsAssignableFrom<IReadOnlyList<object?>>(activity.ToolArguments["inputs"]));
-        Assert.Equal("code interpreter", tracking.ToolNamesByCallId["call-1"]);
-        Assert.True(tracking.ToolCallHasArgumentsById["call-1"]);
+        Assert.True(tracking.TryGetToolName("call-1", out string? toolName));
+        Assert.Equal("code interpreter", toolName);
+        Assert.True(tracking.HasTrackedArguments("call-1"));
     }
 
     [Fact]
@@ -109,15 +108,14 @@ public sealed class WorkflowRequestInfoInterpreterTests
             CreateSingleAgentCommand(),
             requestInfo,
             new AgentIdentity("agent-1", "Primary"),
-            tracking.ToolNamesByCallId,
-            tracking.ToolCallHasArgumentsById);
+            tracking);
 
         Assert.NotNull(activity);
         Assert.Equal("tool-calling", activity.ActivityType);
         Assert.Equal("image generation", activity.ToolName);
         Assert.Null(activity.ToolArguments);
-        Assert.Empty(tracking.ToolNamesByCallId);
-        Assert.Empty(tracking.ToolCallHasArgumentsById);
+        Assert.False(tracking.TryGetToolName("call-1", out _));
+        Assert.False(tracking.HasTrackedArguments("call-1"));
     }
 
     [Fact]
@@ -135,12 +133,11 @@ public sealed class WorkflowRequestInfoInterpreterTests
             CreateSingleAgentCommand(),
             requestInfo,
             new AgentIdentity("agent-1", "Primary"),
-            tracking.ToolNamesByCallId,
-            tracking.ToolCallHasArgumentsById);
+            tracking);
 
         Assert.NotNull(activity);
         Assert.Null(activity.ToolArguments);
-        Assert.False(tracking.ToolCallHasArgumentsById["call-1"]);
+        Assert.False(tracking.HasTrackedArguments("call-1"));
     }
 
     [Fact]
@@ -160,21 +157,25 @@ public sealed class WorkflowRequestInfoInterpreterTests
             CreateSingleAgentCommand(),
             requestInfo,
             new AgentIdentity("agent-1", "Primary"),
-            tracking.ToolNamesByCallId,
-            tracking.ToolCallHasArgumentsById);
+            tracking);
 
         Assert.NotNull(activity);
         Assert.NotNull(activity.ToolArguments);
         Assert.Equal("[truncated]", activity.ToolArguments["command"]);
-        Assert.True(tracking.ToolCallHasArgumentsById["call-1"]);
+        Assert.True(tracking.HasTrackedArguments("call-1"));
     }
 
     [Fact]
     public void TryCreateActivityFromRequest_SkipsDuplicateTrackedToolCallIdsThatAlreadyHaveArguments()
     {
         var tracking = CreateToolTracking();
-        tracking.ToolNamesByCallId["call-1"] = "view";
-        tracking.ToolCallHasArgumentsById["call-1"] = true;
+        tracking.RecordToolStart(
+            "call-1",
+            "view",
+            new Dictionary<string, object?>
+            {
+                ["path"] = @"C:\workspace\seed.txt",
+            });
         RequestInfoEvent requestInfo = CreateRequestInfoEvent(
             new FunctionCallContent("call-1", "view", new Dictionary<string, object?>
             {
@@ -185,20 +186,19 @@ public sealed class WorkflowRequestInfoInterpreterTests
             CreateSingleAgentCommand(),
             requestInfo,
             new AgentIdentity("agent-1", "Primary"),
-            tracking.ToolNamesByCallId,
-            tracking.ToolCallHasArgumentsById);
+            tracking);
 
         Assert.Null(activity);
-        Assert.Equal("view", tracking.ToolNamesByCallId["call-1"]);
-        Assert.True(tracking.ToolCallHasArgumentsById["call-1"]);
+        Assert.True(tracking.TryGetToolName("call-1", out string? toolName));
+        Assert.Equal("view", toolName);
+        Assert.True(tracking.HasTrackedArguments("call-1"));
     }
 
     [Fact]
     public void TryCreateActivityFromRequest_EmitsEnrichmentWhenTrackedToolCallWasMissingArguments()
     {
         var tracking = CreateToolTracking();
-        tracking.ToolNamesByCallId["call-1"] = "view";
-        tracking.ToolCallHasArgumentsById["call-1"] = false;
+        tracking.RecordToolStart("call-1", "view", toolArguments: null);
         RequestInfoEvent requestInfo = CreateRequestInfoEvent(
             new FunctionCallContent("call-1", "view", new Dictionary<string, object?>
             {
@@ -209,16 +209,16 @@ public sealed class WorkflowRequestInfoInterpreterTests
             CreateSingleAgentCommand(),
             requestInfo,
             new AgentIdentity("agent-1", "Primary"),
-            tracking.ToolNamesByCallId,
-            tracking.ToolCallHasArgumentsById);
+            tracking);
 
         Assert.NotNull(activity);
         Assert.Equal("tool-calling", activity.ActivityType);
         Assert.Equal("call-1", activity.ToolCallId);
         Assert.NotNull(activity.ToolArguments);
         Assert.Equal(@"C:\workspace\file.txt", activity.ToolArguments["path"]);
-        Assert.Equal("view", tracking.ToolNamesByCallId["call-1"]);
-        Assert.True(tracking.ToolCallHasArgumentsById["call-1"]);
+        Assert.True(tracking.TryGetToolName("call-1", out string? toolName));
+        Assert.Equal("view", toolName);
+        Assert.True(tracking.HasTrackedArguments("call-1"));
     }
 
     [Fact]
@@ -232,8 +232,7 @@ public sealed class WorkflowRequestInfoInterpreterTests
             CreateHandoffCommand(),
             requestInfo,
             new AgentIdentity("agent-handoff-triage", "Triage"),
-            tracking.ToolNamesByCallId,
-            tracking.ToolCallHasArgumentsById);
+            tracking);
 
         Assert.NotNull(activity);
         Assert.Equal("handoff", activity.ActivityType);
@@ -242,8 +241,8 @@ public sealed class WorkflowRequestInfoInterpreterTests
         Assert.Equal("agent-handoff-triage", activity.SourceAgentId);
         Assert.Equal("Triage", activity.SourceAgentName);
         Assert.Null(activity.ToolName);
-        Assert.Empty(tracking.ToolNamesByCallId);
-        Assert.Empty(tracking.ToolCallHasArgumentsById);
+        Assert.False(tracking.TryGetToolName("call-1", out _));
+        Assert.False(tracking.HasTrackedArguments("call-1"));
     }
 
     [Fact]
@@ -263,8 +262,7 @@ public sealed class WorkflowRequestInfoInterpreterTests
                 "agent-reviewer",
                 "Reviewer",
                 new SubworkflowContext("subworkflow-review", "Review Lane")),
-            tracking.ToolNamesByCallId,
-            tracking.ToolCallHasArgumentsById);
+            tracking);
 
         Assert.NotNull(activity);
         Assert.Equal("tool-calling", activity.ActivityType);
@@ -283,8 +281,7 @@ public sealed class WorkflowRequestInfoInterpreterTests
             CreateHandoffCommandWithReferencedSubworkflow(),
             requestInfo,
             new AgentIdentity("agent-handoff-triage", "Triage"),
-            tracking.ToolNamesByCallId,
-            tracking.ToolCallHasArgumentsById);
+            tracking);
 
         Assert.NotNull(activity);
         Assert.Equal("handoff", activity.ActivityType);
@@ -417,10 +414,7 @@ public sealed class WorkflowRequestInfoInterpreterTests
             workflowLibrary: [nestedWorkflow]);
     }
 
-    private static (
-        ConcurrentDictionary<string, string> ToolNamesByCallId,
-        ConcurrentDictionary<string, bool> ToolCallHasArgumentsById) CreateToolTracking()
-        => (new(StringComparer.Ordinal), new(StringComparer.Ordinal));
+    private static ToolCallRegistry CreateToolTracking() => new();
 
     private static RunTurnCommandDto CreateCommand(
         string orchestrationMode,

src/main/AryxAppService.ts

@@ -117,7 +117,6 @@ import {
 } from '@shared/domain/session';
 import { prepareChatMessageContent } from '@shared/utils/chatMessage';
 import {
-  appendRunActivityEvent,
   cancelSessionRunRecord,
   completeSessionRunRecord,
   createSessionRunRecord,
@@ -132,6 +131,7 @@ import {
 } from '@shared/domain/runTimeline';
 import {
   createSessionToolingSelection,
+  createDefaultQuickPromptSettings,
   listApprovalToolNames,
   normalizeTerminalHeight,
   normalizeTheme,
@@ -140,6 +140,7 @@ import {
   type AppearanceTheme,
   type LspProfileDefinition,
   type McpServerDefinition,
+  type QuickPromptSettings,
   type SessionToolingSelection,
   type WorkspaceToolingSettings,
   normalizeLspProfileDefinition,
@@ -150,7 +151,6 @@ import {
 } from '@shared/domain/tooling';
 import type { WorkspaceState } from '@shared/domain/workspace';
 import { createId, nowIso } from '@shared/utils/ids';
-import { mergeStreamingText } from '@shared/utils/streamingText';
 
 import { WorkspaceRepository } from '@main/persistence/workspaceRepository';
 import { getScratchpadSessionPath } from '@main/persistence/appPaths';
@@ -830,6 +830,21 @@ export class AryxAppService extends EventEmitter<AppServiceEvents> {
     return this.persistAndBroadcast(workspace);
   }
 
+  getQuickPromptSettings(): QuickPromptSettings {
+    return this.workspace?.settings.quickPrompt ?? createDefaultQuickPromptSettings();
+  }
+
+  getCurrentTheme(): AppearanceTheme {
+    return this.workspace?.settings.theme ?? 'dark';
+  }
+
+  async setQuickPromptSettings(patch: Partial<QuickPromptSettings>): Promise<WorkspaceState> {
+    const workspace = await this.loadWorkspace();
+    const current = workspace.settings.quickPrompt ?? createDefaultQuickPromptSettings();
+    workspace.settings.quickPrompt = { ...current, ...patch };
+    return this.persistAndBroadcast(workspace);
+  }
+
   async describeTerminal(): Promise<TerminalSnapshot | undefined> {
     return this.ptyManager.getSnapshot();
   }
@@ -1907,158 +1922,6 @@ export class AryxAppService extends EventEmitter<AppServiceEvents> {
     session.cwd = scratchpadDirectory;
   }
 
-  private async applyTurnDelta(
-    workspace: WorkspaceState,
-    sessionId: string,
-    requestId: string,
-    event: TurnDeltaEvent,
-  ): Promise<void> {
-    if (event.content === undefined && event.contentDelta === undefined) {
-      return;
-    }
-
-    const occurredAt = nowIso();
-    const session = this.requireSession(workspace, sessionId);
-    const existing = session.messages.find((message) => message.id === event.messageId);
-    const content =
-      existing && event.content === undefined
-        ? mergeStreamingText(existing.content, event.contentDelta)
-        : (event.content ?? event.contentDelta);
-
-    // When a new assistant message begins, auto-complete any previously pending
-    // assistant messages so only the latest one shows the "Thinking" indicator.
-    const completedMessages: ChatMessageRecord[] = [];
-    if (existing) {
-      existing.content = content;
-      existing.pending = true;
-      existing.authorName = event.authorName;
-    } else {
-      for (const message of session.messages) {
-        if (message.pending && message.role === 'assistant') {
-          message.pending = false;
-          completedMessages.push(message);
-        }
-      }
-      session.messages.push({
-        id: event.messageId,
-        role: 'assistant',
-        authorName: event.authorName,
-        content,
-        createdAt: occurredAt,
-        pending: true,
-      });
-    }
-
-    const nextRun = this.updateSessionRun(session, requestId, (run) =>
-      upsertRunMessageEvent(run, {
-        messageId: event.messageId,
-        occurredAt,
-        authorName: event.authorName,
-        content,
-        status: 'running',
-      }));
-
-    session.updatedAt = occurredAt;
-    await this.workspaceRepository.save(workspace);
-
-    for (const completed of completedMessages) {
-      this.emitSessionEvent({
-        sessionId,
-        kind: 'message-complete',
-        occurredAt,
-        messageId: completed.id,
-        authorName: completed.authorName,
-        content: completed.content,
-      });
-    }
-    this.emitSessionEvent({
-      sessionId,
-      kind: 'message-delta',
-      occurredAt,
-      messageId: event.messageId,
-      authorName: event.authorName,
-      contentDelta: event.contentDelta,
-      content: event.content,
-    });
-    if (nextRun) {
-      this.emitRunUpdated(sessionId, occurredAt, nextRun);
-    }
-  }
-
-  private async applyMessageReclassified(
-    workspace: WorkspaceState,
-    sessionId: string,
-    event: MessageReclassifiedEvent,
-  ): Promise<void> {
-    const session = this.requireSession(workspace, sessionId);
-    const message = session.messages.find((m) => m.id === event.messageId);
-    if (!message || message.messageKind === 'thinking') {
-      return;
-    }
-
-    message.messageKind = 'thinking';
-    const occurredAt = nowIso();
-    session.updatedAt = occurredAt;
-    await this.workspaceRepository.save(workspace);
-
-    this.emitSessionEvent({
-      sessionId,
-      kind: 'message-reclassified',
-      occurredAt,
-      messageId: event.messageId,
-      messageKind: 'thinking',
-    });
-  }
-
-  private async applyAgentActivity(
-    workspace: WorkspaceState,
-    sessionId: string,
-    requestId: string,
-    event: AgentActivityEvent,
-  ): Promise<void> {
-    const occurredAt = nowIso();
-    const session = this.requireSession(workspace, sessionId);
-    const activityType = event.activityType;
-    let nextRun: SessionRunRecord | undefined;
-    if (activityType === 'thinking' || activityType === 'tool-calling' || activityType === 'handoff') {
-      nextRun = this.updateSessionRun(session, requestId, (run) =>
-        appendRunActivityEvent(run, {
-          activityType,
-          occurredAt,
-          agentId: event.agentId,
-          agentName: event.agentName,
-          sourceAgentId: event.sourceAgentId,
-          sourceAgentName: event.sourceAgentName,
-          toolName: event.toolName,
-          toolCallId: event.toolCallId,
-          toolArguments: event.toolArguments,
-          fileChanges: event.fileChanges,
-        }));
-    }
-    if (nextRun) {
-      session.updatedAt = occurredAt;
-      await this.workspaceRepository.save(workspace);
-      this.emitRunUpdated(sessionId, occurredAt, nextRun);
-    }
-
-    this.emitSessionEvent({
-      sessionId,
-      kind: 'agent-activity',
-      occurredAt,
-      activityType: event.activityType,
-      agentId: event.agentId,
-      agentName: event.agentName,
-      subworkflowNodeId: event.subworkflowNodeId,
-      subworkflowName: event.subworkflowName,
-      sourceAgentId: event.sourceAgentId,
-      sourceAgentName: event.sourceAgentName,
-      toolName: event.toolName,
-      toolCallId: event.toolCallId,
-      toolArguments: event.toolArguments,
-      fileChanges: event.fileChanges,
-    });
-  }
-
   private emitCompletedActivity(
     sessionId: string,
     workflow: WorkflowDefinition,
@@ -2384,6 +2247,31 @@ export class AryxAppService extends EventEmitter<AppServiceEvents> {
           usageQuotaSnapshots: event.quotaSnapshots,
         });
         return;
+      case 'assistant-intent': {
+        const session = this.requireSession(workspace, sessionId);
+        session.currentIntent = event.intent;
+        session.updatedAt = occurredAt;
+        this.emitSessionEvent({
+          sessionId,
+          kind: 'assistant-intent',
+          occurredAt,
+          agentId: event.agentId,
+          agentName: event.agentName,
+          intent: event.intent,
+        });
+        return;
+      }
+      case 'reasoning-delta':
+        this.emitSessionEvent({
+          sessionId,
+          kind: 'reasoning-delta',
+          occurredAt,
+          agentId: event.agentId,
+          agentName: event.agentName,
+          reasoningId: event.reasoningId,
+          reasoningDelta: event.contentDelta,
+        });
+        return;
     }
   }
 

src/main/index.ts

@@ -1,19 +1,47 @@
 import electron from 'electron';
 import type { BrowserWindow as BrowserWindowType } from 'electron';
 
-import { registerIpcHandlers } from '@main/ipc/registerIpcHandlers';
+import { registerIpcHandlers, registerQuickPromptIpcHandlers } from '@main/ipc/registerIpcHandlers';
 import { AryxAppService } from '@main/AryxAppService';
 import { AutoUpdateService } from '@main/services/autoUpdater';
+import { GlobalHotkeyService } from '@main/services/globalHotkey';
 import { createMainWindow } from '@main/windows/createMainWindow';
+import {
+  createQuickPromptWindow,
+  toggleQuickPromptWindow,
+} from '@main/windows/createQuickPromptWindow';
 import { applyTitleBarTheme } from '@main/windows/titleBarTheme';
 import { SystemTray, setupCloseToTray, showAndFocusWindow } from '@main/services/systemTray';
+import { createDefaultQuickPromptSettings } from '@shared/domain/tooling';
 
 const { app, BrowserWindow } = electron;
 
 let mainWindow: BrowserWindowType | undefined;
+let quickPromptWindow: BrowserWindowType | undefined;
 let appService: AryxAppService | undefined;
 let systemTray: SystemTray | undefined;
 let autoUpdateService: AutoUpdateService | undefined;
+let globalHotkeyService: GlobalHotkeyService | undefined;
+
+let quickPromptInitialized = false;
+
+/** Lazily creates the quick prompt window on first use. */
+function ensureQuickPromptWindow(): BrowserWindowType | undefined {
+  if (quickPromptWindow && !quickPromptWindow.isDestroyed()) return quickPromptWindow;
+  if (quickPromptInitialized) return undefined;
+  if (!mainWindow || !appService) return undefined;
+
+  try {
+    quickPromptWindow = createQuickPromptWindow();
+    registerQuickPromptIpcHandlers(mainWindow, appService, quickPromptWindow);
+    quickPromptInitialized = true;
+  } catch (err) {
+    console.error('[aryx] Failed to create quick prompt window:', err);
+    quickPromptInitialized = true;
+  }
+
+  return quickPromptWindow;
+}
 
 async function bootstrap(): Promise<void> {
   appService = new AryxAppService();
@@ -21,13 +49,14 @@ async function bootstrap(): Promise<void> {
   autoUpdateService = new AutoUpdateService({ isPackaged: app.isPackaged });
 
   mainWindow = createMainWindow();
+
   registerIpcHandlers(mainWindow, appService, autoUpdateService);
 
   // Start workspace loading in parallel — don't block window from showing.
   // The renderer fetches the workspace via its own IPC call after mount.
   const workspaceReady = appService.loadWorkspace();
 
-  // Apply theme and set up tray once workspace is available
+  // Apply theme, set up tray, and register global hotkey once workspace is available
   workspaceReady
     .then((workspace) => {
       if (!mainWindow) return;
@@ -47,6 +76,21 @@ async function bootstrap(): Promise<void> {
       appService!.on('workspace-updated', (updatedWorkspace) => {
         systemTray?.updateRunningCount(updatedWorkspace);
       });
+
+      // Register global hotkey — the quick prompt window is created lazily on
+      // first press so it cannot interfere with main window startup.
+      globalHotkeyService = new GlobalHotkeyService();
+      const hotkeySettings = workspace.settings.quickPrompt ?? createDefaultQuickPromptSettings();
+      globalHotkeyService.register(hotkeySettings, () => {
+        const win = ensureQuickPromptWindow();
+        if (win) void toggleQuickPromptWindow(win, appService!.getCurrentTheme());
+      });
+
+      // Re-register hotkey when settings change
+      appService!.on('workspace-updated', (updatedWorkspace) => {
+        const updatedSettings = updatedWorkspace.settings.quickPrompt ?? createDefaultQuickPromptSettings();
+        globalHotkeyService?.update(updatedSettings);
+      });
     })
     .catch((error) => {
       console.error('[aryx bootstrap] workspace load failed', error);
@@ -72,7 +116,9 @@ app.on('window-all-closed', () => {
   if (process.platform === 'darwin') return;
 
   const windows = BrowserWindow.getAllWindows();
-  const allHidden = windows.length > 0 && windows.every((w) => !w.isVisible());
+  // Ignore the quick prompt window (it's always hidden, never truly closed)
+  const visibleWindows = windows.filter((w) => w !== quickPromptWindow);
+  const allHidden = visibleWindows.length > 0 && visibleWindows.every((w) => !w.isVisible());
   if (allHidden) return;
 
   app.quit();
@@ -87,6 +133,7 @@ app.on('activate', async () => {
 });
 
 app.on('before-quit', async () => {
+  globalHotkeyService?.dispose();
   autoUpdateService?.dispose();
   autoUpdateService = undefined;
   systemTray?.dispose();

src/main/ipc/registerIpcHandlers.ts

@@ -51,14 +51,18 @@ import type {
   UpdateSessionModelConfigInput,
   UpdateSessionApprovalSettingsInput,
   UpdateSessionToolingInput,
+  QuickPromptSendInput,
 } from '@shared/contracts/ipc';
 import type { QuerySessionsInput } from '@shared/domain/sessionLibrary';
-import type { AppearanceTheme } from '@shared/domain/tooling';
+import type { AppearanceTheme, QuickPromptSettings } from '@shared/domain/tooling';
 
 import { AryxAppService } from '@main/AryxAppService';
 import { AutoUpdateService } from '@main/services/autoUpdater';
 import { createDesktopNotificationHandler } from '@main/services/desktopNotifications';
 import { applyTitleBarTheme } from '@main/windows/titleBarTheme';
+import { hideQuickPromptWindow } from '@main/windows/createQuickPromptWindow';
+import { buildAvailableModelCatalog } from '@shared/domain/models';
+import { SCRATCHPAD_PROJECT_ID } from '@shared/domain/project';
 import type { UpdateStatus } from '@shared/contracts/ipc';
 
 const { ipcMain } = electron;
@@ -348,4 +352,101 @@ export function registerIpcHandlers(
   service.on('terminal-exit', (info) => {
     window.webContents.send(ipcChannels.terminalExit, info);
   });
+
+  // --- Quick Prompt IPC (window-independent) ---
+
+  ipcMain.handle(ipcChannels.quickPromptGetCapabilities, async () => {
+    const capabilities = await service.describeSidecarCapabilities();
+    const settings = service.getQuickPromptSettings();
+    const models = buildAvailableModelCatalog(capabilities.models);
+    return {
+      models,
+      defaultModel: settings.defaultModel,
+      defaultReasoningEffort: settings.defaultReasoningEffort,
+    };
+  });
+
+  ipcMain.handle(
+    ipcChannels.quickPromptSetSettings,
+    (_event, settings: Partial<QuickPromptSettings>) => service.setQuickPromptSettings(settings),
+  );
+
+  ipcMain.handle(
+    ipcChannels.quickPromptGetSettings,
+    () => service.getQuickPromptSettings(),
+  );
+}
+
+/**
+ * Register IPC handlers that depend on the quick prompt BrowserWindow.
+ * Called separately after the quick prompt window is created (deferred from bootstrap).
+ */
+export function registerQuickPromptIpcHandlers(
+  mainWindow: BrowserWindow,
+  service: AryxAppService,
+  quickPromptWindow: BrowserWindow,
+): void {
+  let quickPromptSessionId: string | undefined;
+
+  ipcMain.handle(ipcChannels.quickPromptSend, async (_event, input: QuickPromptSendInput) => {
+    const workspace = await service.loadWorkspace();
+    const workflowId = workspace.selectedWorkflowId ?? workspace.workflows[0]?.id;
+    if (!workflowId) throw new Error('No workflow available');
+
+    const created = await service.createSession(SCRATCHPAD_PROJECT_ID, workflowId);
+    const session = created.sessions[0];
+    if (!session) throw new Error('Failed to create quick prompt session');
+
+    quickPromptSessionId = session.id;
+
+    // Apply model override if provided
+    if (input.model) {
+      await service.updateSessionModelConfig(session.id, input.model, input.reasoningEffort);
+    }
+
+    // Send the message (fire-and-forget — results arrive via session events)
+    void service.sendSessionMessage(session.id, input.content);
+
+    return { sessionId: session.id };
+  });
+
+  ipcMain.handle(ipcChannels.quickPromptCancelTurn, async () => {
+    if (quickPromptSessionId) {
+      await service.cancelSessionTurn(quickPromptSessionId);
+    }
+  });
+
+  ipcMain.handle(ipcChannels.quickPromptDiscard, async () => {
+    if (quickPromptSessionId) {
+      await service.deleteSession(quickPromptSessionId);
+      quickPromptSessionId = undefined;
+    }
+    hideQuickPromptWindow(quickPromptWindow);
+  });
+
+  ipcMain.handle(ipcChannels.quickPromptClose, async () => {
+    quickPromptSessionId = undefined;
+    hideQuickPromptWindow(quickPromptWindow);
+  });
+
+  ipcMain.handle(ipcChannels.quickPromptContinueInAryx, async () => {
+    if (quickPromptSessionId) {
+      await service.selectSession(quickPromptSessionId);
+      quickPromptSessionId = undefined;
+    }
+    hideQuickPromptWindow(quickPromptWindow);
+    // Show and focus the main window
+    if (!mainWindow.isDestroyed()) {
+      if (mainWindow.isMinimized()) mainWindow.restore();
+      mainWindow.show();
+      mainWindow.focus();
+    }
+  });
+
+  // Route session events to the quick prompt window
+  service.on('session-event', (event) => {
+    if (event.sessionId === quickPromptSessionId && !quickPromptWindow.isDestroyed()) {
+      quickPromptWindow.webContents.send(ipcChannels.quickPromptSessionEvent, event);
+    }
+  });
 }

src/main/services/globalHotkey.ts

@@ -0,0 +1,90 @@
+import electron from 'electron';
+
+import type { QuickPromptSettings } from '@shared/domain/tooling';
+
+export class GlobalHotkeyService {
+  private currentAccelerator: string | undefined;
+  private lastFailedAccelerator: string | undefined;
+  private callback: (() => void) | undefined;
+
+  register(settings: QuickPromptSettings, callback: () => void): void {
+    this.callback = callback;
+
+    if (!settings.enabled) {
+      this.unregister();
+      return;
+    }
+
+    const accelerator = toElectronAccelerator(settings.hotkey);
+
+    // Already registered this accelerator — nothing to do
+    if (accelerator === this.currentAccelerator) return;
+
+    // Don't retry an accelerator that already failed (avoids log spam on
+    // repeated workspace-updated events during startup)
+    if (accelerator === this.lastFailedAccelerator) return;
+
+    this.unregister();
+
+    // Access globalShortcut lazily to ensure electron is fully initialised
+    const { globalShortcut } = electron;
+    if (!globalShortcut) {
+      console.error('[globalHotkey] electron.globalShortcut is not available');
+      return;
+    }
+
+    try {
+      const registered = globalShortcut.register(accelerator, callback);
+      if (registered) {
+        console.info(`[globalHotkey] Registered: ${accelerator}`);
+        this.currentAccelerator = accelerator;
+        this.lastFailedAccelerator = undefined;
+      } else {
+        console.warn(
+          `[globalHotkey] Failed to register accelerator: ${accelerator}` +
+            ' — it may be reserved by the OS or another application',
+        );
+        this.currentAccelerator = undefined;
+        this.lastFailedAccelerator = accelerator;
+      }
+    } catch (err) {
+      console.error(`[globalHotkey] Error registering ${accelerator}:`, err);
+      this.currentAccelerator = undefined;
+      this.lastFailedAccelerator = accelerator;
+    }
+  }
+
+  /** Re-registers with updated settings (e.g. hotkey string changed). */
+  update(settings: QuickPromptSettings): void {
+    if (!this.callback) return;
+    this.register(settings, this.callback);
+  }
+
+  unregister(): void {
+    if (this.currentAccelerator) {
+      try {
+        const { globalShortcut } = electron;
+        globalShortcut?.unregister(this.currentAccelerator);
+      } catch {
+        // best-effort
+      }
+      this.currentAccelerator = undefined;
+    }
+    this.lastFailedAccelerator = undefined;
+  }
+
+  dispose(): void {
+    this.unregister();
+    this.callback = undefined;
+  }
+}
+
+/**
+ * Convert a portable hotkey string to an Electron accelerator.
+ *
+ * - "Super" → "Meta" (Win key on Windows, Cmd on macOS)
+ * - Strings already using Electron-native names pass through unchanged.
+ */
+function toElectronAccelerator(hotkey: string): string {
+  return hotkey.replace(/\bSuper\b/gi, 'Meta');
+}

src/main/services/sessionTurnExecutor.ts

@@ -633,7 +633,7 @@ export class SessionTurnExecutor {
       messageId: event.messageId,
       authorName: event.authorName,
       contentDelta: event.contentDelta,
-      content: event.content,
+      content,
     });
     if (nextRun) {
       this.emitRunUpdated(sessionId, occurredAt, nextRun);
@@ -822,6 +822,7 @@ export class SessionTurnExecutor {
     const completedAt = nowIso();
     session.status = 'idle';
     session.lastError = undefined;
+    session.currentIntent = undefined;
     session.pendingUserInput = undefined;
     session.pendingPlanReview = undefined;
     session.pendingMcpAuth = undefined;
@@ -854,6 +855,7 @@ export class SessionTurnExecutor {
     const cancelledAt = nowIso();
     session.status = 'idle';
     session.lastError = undefined;
+    session.currentIntent = undefined;
     session.pendingUserInput = undefined;
     session.pendingPlanReview = undefined;
     session.pendingMcpAuth = undefined;

src/main/windows/createQuickPromptWindow.ts

@@ -0,0 +1,105 @@
+import electron from 'electron';
+import type { BrowserWindow as BrowserWindowType } from 'electron';
+import { join } from 'node:path';
+
+import { resolveWindowIconPath } from '@main/windows/appIcon';
+
+const { app, BrowserWindow, screen } = electron;
+
+export function createQuickPromptWindow(): BrowserWindowType {
+  const window = new BrowserWindow({
+    width: 680,
+    height: 520,
+    minHeight: 72,
+    show: false,
+    frame: false,
+    transparent: true,
+    resizable: false,
+    skipTaskbar: true,
+    alwaysOnTop: true,
+    maximizable: false,
+    minimizable: false,
+    fullscreenable: false,
+    focusable: true,
+    title: 'Aryx Quick Prompt',
+    icon: resolveWindowIconPath({
+      appPath: app.getAppPath(),
+      platform: process.platform,
+    }),
+    webPreferences: {
+      preload: join(__dirname, '../preload/quickprompt.js'),
+      contextIsolation: true,
+      nodeIntegration: false,
+    },
+  });
+
+  const rendererUrl = process.env.ELECTRON_RENDERER_URL;
+
+  if (rendererUrl) {
+    void window.loadURL(`${rendererUrl}/quickprompt.html`);
+  } else {
+    void window.loadFile(join(__dirname, '../../dist/renderer/quickprompt.html'));
+  }
+
+  // Hide on blur — but only if the window itself loses focus (not from
+  // devtools or transient focus changes during show/hide).
+  window.on('blur', () => {
+    // Longer delay: avoid hiding during transient focus shifts when
+    // interacting with model selector dropdown or other UI elements.
+    setTimeout(() => {
+      if (window.isVisible() && !window.isFocused()) {
+        window.webContents.send('quick-prompt:hide');
+        window.hide();
+      }
+    }, 200);
+  });
+
+  return window;
+}
+
+export async function toggleQuickPromptWindow(window: BrowserWindowType, theme?: string): Promise<void> {
+  if (window.isVisible()) {
+    window.webContents.send('quick-prompt:hide');
+    window.hide();
+    return;
+  }
+
+  // Wait for the renderer to finish loading before showing — on the very
+  // first activation the page may still be loading from disk/dev-server.
+  if (window.webContents.isLoading()) {
+    await new Promise<void>((resolve) => {
+      window.webContents.once('did-finish-load', () => resolve());
+    });
+  }
+
+  centerOnActiveDisplay(window);
+  window.webContents.send('quick-prompt:show', theme ?? 'dark');
+  window.show();
+  window.focus();
+}
+
+export function showQuickPromptWindow(window: BrowserWindowType, theme?: string): void {
+  centerOnActiveDisplay(window);
+  window.webContents.send('quick-prompt:show', theme ?? 'dark');
+  window.show();
+  window.focus();
+}
+
+export function hideQuickPromptWindow(window: BrowserWindowType): void {
+  if (!window.isVisible()) return;
+  window.webContents.send('quick-prompt:hide');
+  window.hide();
+}
+
+function centerOnActiveDisplay(window: BrowserWindowType): void {
+  const cursorPoint = screen.getCursorScreenPoint();
+  const activeDisplay = screen.getDisplayNearestPoint(cursorPoint);
+  const { x, y, width, height } = activeDisplay.workArea;
+
+  const [windowWidth] = window.getSize();
+  const windowX = Math.round(x + (width - windowWidth) / 2);
+  // Position in the upper-third of the screen for command-bar feel
+  const windowY = Math.round(y + height * 0.25);
+
+  window.setPosition(windowX, windowY);
+}

src/preload/index.ts

@@ -36,6 +36,8 @@ const api: ElectronApi = {
   setNotificationsEnabled: (enabled) => ipcRenderer.invoke(ipcChannels.setNotificationsEnabled, enabled),
   setMinimizeToTray: (enabled) => ipcRenderer.invoke(ipcChannels.setMinimizeToTray, enabled),
   setGitAutoRefreshEnabled: (enabled) => ipcRenderer.invoke(ipcChannels.setGitAutoRefreshEnabled, enabled),
+  getQuickPromptSettings: () => ipcRenderer.invoke(ipcChannels.quickPromptGetSettings),
+  setQuickPromptSettings: (settings) => ipcRenderer.invoke(ipcChannels.quickPromptSetSettings, settings),
   checkForUpdates: () => ipcRenderer.invoke(ipcChannels.checkForUpdates),
   installUpdate: () => ipcRenderer.invoke(ipcChannels.installUpdate),
   saveMcpServer: (input) => ipcRenderer.invoke(ipcChannels.saveMcpServer, input),

src/preload/quickprompt.ts

@@ -0,0 +1,50 @@
+import electron from 'electron';
+
+import type { QuickPromptElectronApi } from '@shared/contracts/ipc';
+
+const { contextBridge, ipcRenderer } = electron;
+
+// Channel constants are inlined here (not imported from @shared/contracts/channels)
+// to avoid Rollup code-splitting a shared chunk that Electron's sandboxed preload
+// environment cannot resolve at runtime.
+const ch = {
+  send: 'quick-prompt:send',
+  discard: 'quick-prompt:discard',
+  close: 'quick-prompt:close',
+  continueInAryx: 'quick-prompt:continue-in-aryx',
+  cancelTurn: 'quick-prompt:cancel-turn',
+  getCapabilities: 'quick-prompt:get-capabilities',
+  setSettings: 'quick-prompt:set-settings',
+  sessionEvent: 'quick-prompt:session-event',
+  show: 'quick-prompt:show',
+  hide: 'quick-prompt:hide',
+} as const;
+
+const api: QuickPromptElectronApi = {
+  send: (input) => ipcRenderer.invoke(ch.send, input),
+  discard: () => ipcRenderer.invoke(ch.discard),
+  close: () => ipcRenderer.invoke(ch.close),
+  continueInAryx: () => ipcRenderer.invoke(ch.continueInAryx),
+  cancelTurn: () => ipcRenderer.invoke(ch.cancelTurn),
+  getCapabilities: () => ipcRenderer.invoke(ch.getCapabilities),
+  setSettings: (settings) => ipcRenderer.invoke(ch.setSettings, settings),
+  onSessionEvent: (listener) => {
+    const handler = (_event: Electron.IpcRendererEvent, sessionEvent: Parameters<typeof listener>[0]) =>
+      listener(sessionEvent);
+
+    ipcRenderer.on(ch.sessionEvent, handler);
+    return () => ipcRenderer.off(ch.sessionEvent, handler);
+  },
+  onShow: (listener) => {
+    const handler = (_event: Electron.IpcRendererEvent, theme: string) => listener(theme);
+    ipcRenderer.on(ch.show, handler);
+    return () => ipcRenderer.off(ch.show, handler);
+  },
+  onHide: (listener) => {
+    const handler = () => listener();
+    ipcRenderer.on(ch.hide, handler);
+    return () => ipcRenderer.off(ch.hide, handler);
+  },
+};
+
+contextBridge.exposeInMainWorld('quickPromptApi', api);

src/renderer/App.tsx

@@ -34,6 +34,7 @@ import { isScratchpadProject, SCRATCHPAD_PROJECT_ID } from '@shared/domain/proje
 import type { ProjectGitFileReference } from '@shared/domain/project';
 import { applySessionModelConfig } from '@shared/domain/session';
 import type { AppearanceTheme, LspProfileDefinition, McpServerDefinition } from '@shared/domain/tooling';
+import { createDefaultQuickPromptSettings, type QuickPromptSettings } from '@shared/domain/tooling';
 import type { WorkspaceAgentDefinition } from '@shared/domain/workspaceAgent';
 import type { WorkspaceState } from '@shared/domain/workspace';
 import type { UpdateStatus } from '@shared/contracts/ipc';
@@ -59,7 +60,7 @@ const WelcomePane = lazy(() => import('@renderer/components/WelcomePane').then((
 const WorkflowPicker = lazy(() => import('@renderer/components/workflow/WorkflowPicker').then((m) => ({ default: m.WorkflowPicker })));
 
 // Re-export type-only imports from lazy modules so they're available without pulling in the bundle
-type SettingsSection = 'appearance' | 'connection' | 'workflows' | 'agents' | 'mcp-servers' | 'lsp-profiles' | 'troubleshooting';
+type SettingsSection = 'appearance' | 'connection' | 'workflows' | 'agents' | 'mcp-servers' | 'lsp-profiles' | 'quick-prompt' | 'troubleshooting';
 type BottomPanelTab = 'terminal' | 'git';
 
 // Constants duplicated from BottomPanel to avoid importing the full module at startup
@@ -180,6 +181,9 @@ export default function App() {
   // Commit composer state
   const [commitComposerCtx, setCommitComposerCtx] = useState<{ projectId: string; sessionId: string; runId?: string }>();
 
+  // Quick prompt settings
+  const [quickPromptSettings, setQuickPromptSettings] = useState<QuickPromptSettings>(createDefaultQuickPromptSettings);
+
   // Bottom panel state (terminal + git)
   const [bottomPanelOpen, setBottomPanelOpen] = useState(false);
   const [bottomPanelTab, setBottomPanelTab] = useState<BottomPanelTab>('terminal');
@@ -198,6 +202,11 @@ export default function App() {
       .then((ws) => !disposed && setWorkspace(ws))
       .catch((e) => !disposed && setError(e instanceof Error ? e.message : String(e)));
 
+    void api
+      .getQuickPromptSettings()
+      .then((s) => !disposed && setQuickPromptSettings(s))
+      .catch(() => { /* quick prompt settings unavailable, use defaults */ });
+
     const offWorkspace = api.onWorkspaceUpdated((ws) => {
       setWorkspace(ws);
       setError(undefined);
@@ -858,6 +867,12 @@ export default function App() {
           void api.resolveWorkspaceDiscoveredTooling({ serverIds, resolution });
         }}
         onGetQuota={() => api.getQuota()}
+        quickPromptSettings={quickPromptSettings}
+        onSetQuickPromptSettings={(patch) => {
+          const updated = { ...quickPromptSettings, ...patch };
+          setQuickPromptSettings(updated);
+          void api.setQuickPromptSettings(patch);
+        }}
       />
     </Suspense>
   ) : null;

src/renderer/components/ChatPane.tsx

@@ -530,7 +530,7 @@ export function ChatPane({
               </div>
             )}
             {isSessionBusy && !pendingApproval && !pendingUserInput && (() => {
-              const label = summarizeSessionActivity(sessionActivity);
+              const label = session.currentIntent ?? summarizeSessionActivity(sessionActivity);
               return (
                 <div className="flex items-center gap-1.5 text-[12px] text-[var(--color-accent-sky)]">
                   <span className="size-2 animate-pulse rounded-full bg-[var(--color-accent-sky)]" />
@@ -593,6 +593,7 @@ export function ChatPane({
                         isActive={isTurnActive(item, itemIndex)}
                         turnStartedAt={item.turnStartedAt}
                         sessionId={session.id}
+                        currentIntent={session.currentIntent}
                         agentNames={item.agentNames}
                         isLastRunPanel={item.isLastRunPanel}
                         onDiscard={onDiscardRunChanges}

src/renderer/components/SettingsPanel.tsx

@@ -1,5 +1,5 @@
 import { useEffect, useState, type ReactNode } from 'react';
-import { ChevronLeft, ChevronRight, CircleCheck, Code, Cpu, FolderOpen, GitBranch, Palette, Plus, RefreshCw, Server, TriangleAlert, UserCircle, Wrench } from 'lucide-react';
+import { ChevronLeft, ChevronRight, CircleCheck, Code, Cpu, FolderOpen, GitBranch, Palette, Plus, RefreshCw, Server, Sparkles, TriangleAlert, UserCircle, Wrench } from 'lucide-react';
 
 import { CopilotStatusCard } from '@renderer/components/CopilotStatusCard';
 import { WorkflowEditor } from '@renderer/components/WorkflowEditor';
@@ -8,6 +8,7 @@ import { LspProfileEditor } from '@renderer/components/settings/LspProfileEditor
 import { McpServerEditor } from '@renderer/components/settings/McpServerEditor';
 import { WorkspaceAgentEditor } from '@renderer/components/settings/WorkspaceAgentEditor';
 import { getElectronApi } from '@renderer/lib/electronApi';
+import { isMac } from '@renderer/lib/platform';
 import type { SidecarCapabilities, QuotaSnapshot } from '@shared/contracts/sidecar';
 import type { DiscoveredMcpServer, DiscoveredToolingState } from '@shared/domain/discoveredTooling';
 import { listAcceptedDiscoveredMcpServers, listPendingDiscoveredMcpServers } from '@shared/domain/discoveredTooling';
@@ -21,6 +22,7 @@ import {
   type AppearanceTheme,
   type LspProfileDefinition,
   type McpServerDefinition,
+  type QuickPromptSettings,
   type WorkspaceToolingSettings,
 } from '@shared/domain/tooling';
 import { normalizeWorkspaceAgentDefinition, findWorkspaceAgentUsages, type WorkspaceAgentDefinition } from '@shared/domain/workspaceAgent';
@@ -62,9 +64,11 @@ interface SettingsPanelProps {
   onGetQuota?: () => Promise<Record<string, QuotaSnapshot>>;
   workflowTemplates?: WorkflowTemplateDefinition[];
   onCreateWorkflowFromTemplate?: (templateId: string, name?: string) => Promise<void>;
+  quickPromptSettings?: QuickPromptSettings;
+  onSetQuickPromptSettings?: (patch: Partial<QuickPromptSettings>) => void;
 }
 
-export type SettingsSection = 'appearance' | 'connection' | 'workflows' | 'agents' | 'mcp-servers' | 'lsp-profiles' | 'troubleshooting';
+export type SettingsSection = 'appearance' | 'connection' | 'workflows' | 'agents' | 'mcp-servers' | 'lsp-profiles' | 'quick-prompt' | 'troubleshooting';
 
 interface NavItem {
   id: SettingsSection;
@@ -82,6 +86,7 @@ const navGroups: NavGroup[] = [
     label: 'General',
     items: [
       { id: 'appearance', label: 'Appearance', icon: <Palette className="size-3.5" /> },
+      { id: 'quick-prompt', label: 'Quick Prompt', icon: <Sparkles className="size-3.5" /> },
     ],
   },
   {
@@ -149,6 +154,8 @@ export function SettingsPanel({
   onGetQuota,
   workflowTemplates,
   onCreateWorkflowFromTemplate,
+  quickPromptSettings,
+  onSetQuickPromptSettings,
 }: SettingsPanelProps) {
   const [activeSection, setActiveSection] = useState<SettingsSection>(initialSection ?? 'appearance');
   const [editingWorkflow, setEditingWorkflow] = useState<WorkflowDefinition | null>(null);
@@ -380,6 +387,13 @@ export function SettingsPanel({
                 profiles={toolingSettings.lspProfiles}
               />
             )}
+            {activeSection === 'quick-prompt' && (
+              <QuickPromptSettingsSection
+                settings={quickPromptSettings}
+                availableModels={availableModels}
+                onUpdate={onSetQuickPromptSettings}
+              />
+            )}
             {activeSection === 'troubleshooting' && (
               <TroubleshootingSection
                 onOpenAppDataFolder={onOpenAppDataFolder}
@@ -1304,3 +1318,221 @@ function TroubleshootingAction({
     </button>
   );
 }
+
+function QuickPromptSettingsSection({
+  settings,
+  availableModels,
+  onUpdate,
+}: {
+  settings?: QuickPromptSettings;
+  availableModels: ReadonlyArray<ModelDefinition>;
+  onUpdate?: (patch: Partial<QuickPromptSettings>) => void;
+}) {
+  const [modelDropdownOpen, setModelDropdownOpen] = useState(false);
+
+  const enabled = settings?.enabled ?? true;
+  const hotkey = settings?.hotkey ?? 'Alt+Shift+C';
+  const defaultModel = settings?.defaultModel;
+  const defaultReasoning = settings?.defaultReasoningEffort;
+
+  const resolvedModel = defaultModel ? availableModels.find((m) => m.id === defaultModel) : undefined;
+  const modelSupportsReasoning = resolvedModel?.supportedReasoningEfforts?.length;
+
+  const hotkeyKeys = hotkey
+    .replace('Super', isMac ? '⌘' : 'Win')
+    .replace('Alt', isMac ? '⌥' : 'Alt')
+    .replace('Shift', '⇧')
+    .split('+')
+    .map((k) => k.trim());
+
+  // Group models by tier for the dropdown
+  const tierOrder = ['premium', 'standard', 'fast'] as const;
+  const tierLabels: Record<string, string> = { premium: 'Premium', standard: 'Standard', fast: 'Fast' };
+  const groupedModels = tierOrder
+    .map((tier) => ({
+      tier,
+      label: tierLabels[tier],
+      models: availableModels.filter((m) => m.tier === tier),
+    }))
+    .filter((g) => g.models.length > 0);
+
+  // Models without a tier
+  const untypedModels = availableModels.filter((m) => !m.tier);
+  if (untypedModels.length > 0) {
+    groupedModels.push({ tier: 'other' as never, label: 'Other', models: untypedModels });
+  }
+
+  return (
+    <div>
+      <div className="mb-1">
+        <h3 className="font-display text-[13px] font-semibold text-[var(--color-text-primary)]">Quick Prompt</h3>
+        <p className="mt-0.5 text-[12px] text-[var(--color-text-muted)]">
+          Press a global hotkey to ask the AI a quick question from anywhere
+        </p>
+      </div>
+
+      {/* Enable / Disable + Keyboard Shortcut — compact row */}
+      <div className="mt-5 flex items-center gap-3 rounded-lg border border-[var(--color-border)] px-4 py-3">
+        <button
+          className="flex flex-1 items-start gap-0 text-left"
+          onClick={() => onUpdate?.({ enabled: !enabled })}
+          type="button"
+        >
+          <div className="flex-1">
+            <span className="text-[13px] font-medium text-[var(--color-text-primary)]">
+              Global hotkey
+            </span>
+            <div className="mt-1.5 flex items-center gap-1">
+              {hotkeyKeys.map((key) => (
+                <kbd
+                  key={key}
+                  className="rounded-[5px] border border-[var(--color-border)] bg-[var(--color-surface-2)] px-2 py-[3px] font-mono text-[11px] font-medium leading-none text-[var(--color-text-secondary)] shadow-sm shadow-black/20"
+                >
+                  {key}
+                </kbd>
+              ))}
+            </div>
+          </div>
+        </button>
+        <button onClick={() => onUpdate?.({ enabled: !enabled })} type="button">
+          <ToggleSwitch enabled={enabled} />
+        </button>
+      </div>
+
+      {/* Default Model — compact dropdown selector */}
+      <div className="mt-6">
+        <h3 className="font-display text-[13px] font-semibold text-[var(--color-text-primary)]">Default Model</h3>
+        <p className="mt-0.5 text-[12px] text-[var(--color-text-muted)]">
+          Override the workflow model for Quick Prompt sessions
+        </p>
+
+        <div className="relative mt-3">
+          {/* Trigger button */}
+          <button
+            onClick={() => setModelDropdownOpen((prev) => !prev)}
+            className={`flex w-full items-center gap-3 rounded-lg border px-4 py-3 text-left transition ${
+              modelDropdownOpen
+                ? 'border-[var(--color-accent)]/40 bg-[var(--color-accent-muted)]'
+                : 'border-[var(--color-border)] hover:bg-[var(--color-surface-3)]/40'
+            }`}
+            type="button"
+            aria-haspopup="listbox"
+            aria-expanded={modelDropdownOpen}
+          >
+            <div className="flex-1">
+              <span className="text-[13px] font-medium text-[var(--color-text-primary)]">
+                {resolvedModel?.name ?? 'Workflow default'}
+              </span>
+              {resolvedModel?.tier && (
+                <span className={`ml-2 inline-flex items-center gap-1 rounded-[4px] px-1.5 py-px text-[10px] font-medium ${
+                  resolvedModel.tier === 'premium' ? 'bg-amber-400/10 text-amber-400' :
+                  resolvedModel.tier === 'fast' ? 'bg-emerald-400/10 text-emerald-400' :
+                  'bg-[var(--color-accent-muted)] text-[var(--color-text-accent)]'
+                }`}>
+                  {resolvedModel.tier}
+                </span>
+              )}
+            </div>
+            <ChevronRight className={`size-4 text-[var(--color-text-muted)] transition-transform ${modelDropdownOpen ? 'rotate-90' : ''}`} />
+          </button>
+
+          {/* Dropdown */}
+          {modelDropdownOpen && (
+            <div className="absolute top-full left-0 right-0 z-10 mt-1 overflow-hidden rounded-xl border border-[var(--color-border)] bg-[var(--color-surface-1)] shadow-xl shadow-black/40">
+              <div className="max-h-[280px] overflow-y-auto p-1.5">
+                {/* Workflow default option */}
+                <button
+                  onClick={() => { onUpdate?.({ defaultModel: undefined }); setModelDropdownOpen(false); }}
+                  className={`flex w-full items-center gap-2 rounded-lg px-3 py-2 text-left transition ${
+                    !defaultModel
+                      ? 'bg-[var(--color-accent-muted)] text-[var(--color-text-primary)]'
+                      : 'text-[var(--color-text-secondary)] hover:bg-[var(--color-surface-2)] hover:text-[var(--color-text-primary)]'
+                  }`}
+                  type="button"
+                  role="option"
+                  aria-selected={!defaultModel}
+                >
+                  <span className="flex-1 text-[12px] font-medium">Workflow default</span>
+                  {!defaultModel && <CircleCheck className="size-3.5 text-[var(--color-accent)]" />}
+                </button>
+
+                {/* Grouped models */}
+                {groupedModels.map((group) => (
+                  <div key={group.tier}>
+                    <div className="mx-2 mt-2 mb-1 border-t border-[var(--color-border-subtle)]/50" />
+                    <div className="px-2.5 pt-1.5 pb-0.5 text-[10px] font-semibold tracking-wider text-[var(--color-text-muted)] uppercase">
+                      {group.label}
+                    </div>
+                    {group.models.map((model) => {
+                      const isSelected = defaultModel === model.id;
+                      return (
+                        <button
+                          key={model.id}
+                          onClick={() => { onUpdate?.({ defaultModel: model.id }); setModelDropdownOpen(false); }}
+                          className={`flex w-full items-center gap-2 rounded-lg px-3 py-[7px] text-left transition ${
+                            isSelected
+                              ? 'bg-[var(--color-accent-muted)] text-[var(--color-text-primary)]'
+                              : 'text-[var(--color-text-secondary)] hover:bg-[var(--color-surface-2)] hover:text-[var(--color-text-primary)]'
+                          }`}
+                          type="button"
+                          role="option"
+                          aria-selected={isSelected}
+                        >
+                          <span className="flex-1 truncate text-[12px] font-medium">{model.name}</span>
+                          {model.supportedReasoningEfforts?.length ? (
+                            <span className="text-[9px] font-semibold tracking-wide text-[var(--color-text-muted)] uppercase">reasoning</span>
+                          ) : null}
+                          {isSelected && <CircleCheck className="size-3.5 flex-none text-[var(--color-accent)]" />}
+                        </button>
+                      );
+                    })}
+                  </div>
+                ))}
+              </div>
+            </div>
+          )}
+        </div>
+      </div>
+
+      {/* Reasoning Effort — only shown when selected model supports it */}
+      {modelSupportsReasoning ? (
+        <div className="mt-6">
+          <h3 className="font-display text-[13px] font-semibold text-[var(--color-text-primary)]">Reasoning Effort</h3>
+          <p className="mt-0.5 text-[12px] text-[var(--color-text-muted)]">
+            Higher effort produces more thorough answers but takes longer
+          </p>
+
+          <div className="mt-3 flex gap-1.5">
+            {([undefined, 'low', 'medium', 'high'] as const).map((effort) => {
+              const isActive = defaultReasoning === effort;
+              const label = effort ?? 'Auto';
+              const displayLabel = label.charAt(0).toUpperCase() + label.slice(1);
+
+              // Only show efforts the model actually supports (plus "Auto")
+              if (effort && !resolvedModel?.supportedReasoningEfforts?.includes(effort)) return null;
+
+              return (
+                <button
+                  key={displayLabel}
+                  onClick={() => onUpdate?.({ defaultReasoningEffort: effort })}
+                  className={`flex-1 rounded-lg border py-2 text-[12px] font-medium transition-all duration-150 ${
+                    isActive
+                      ? 'border-[var(--color-accent)]/40 bg-[var(--color-accent)]/12 text-[var(--color-text-accent)]'
+                      : 'border-[var(--color-border)] text-[var(--color-text-muted)] hover:border-[var(--color-border-glow)] hover:text-[var(--color-text-secondary)]'
+                  }`}
+                  type="button"
+                >
+                  {displayLabel}
+                </button>
+              );
+            })}
+          </div>
+        </div>
+      ) : defaultModel ? (
+        <p className="mt-4 text-[11px] text-[var(--color-text-muted)]">
+          {resolvedModel?.name ?? 'Selected model'} does not support configurable reasoning effort.
+        </p>
+      ) : null}
+    </div>
+  );
+}

src/renderer/components/chat/TurnActivityPanel.tsx

@@ -41,6 +41,7 @@ export interface TurnActivityPanelProps {
   isActive: boolean;
   turnStartedAt?: string;
   sessionId: string;
+  currentIntent?: string;
   agentNames?: ReadonlySet<string>;
   isLastRunPanel?: boolean;
   onDiscard?: (sessionId: string, runId: string, files?: ProjectGitFileReference[]) => Promise<unknown>;
@@ -418,6 +419,7 @@ export function TurnActivityPanel({
   isActive,
   turnStartedAt,
   sessionId,
+  currentIntent,
   agentNames,
   isLastRunPanel,
   onDiscard,
@@ -471,8 +473,12 @@ export function TurnActivityPanel({
     return groupActivityStream(stream);
   }, [thinkingMessages, scopedEvents]);
 
-  // Extract intent text for the header
-  const intentText = useMemo(() => extractLatestIntent(scopedEvents), [scopedEvents]);
+  // Prefer the session-level normalized intent when active; fall back to
+  // scanning run timeline for report_intent tool calls (backward compat).
+  const intentText = useMemo(
+    () => (isActive ? currentIntent : undefined) ?? extractLatestIntent(scopedEvents),
+    [isActive, currentIntent, scopedEvents],
+  );
   const fallbackSummary = useMemo(
     () => !intentText ? generateActivitySummary(scopedEvents) : undefined,
     [intentText, scopedEvents],

src/renderer/components/quick-prompt/ModelSelector.tsx

@@ -0,0 +1,200 @@
+import { useEffect, useRef, useMemo } from 'react';
+import { Check, Brain } from 'lucide-react';
+
+import { ProviderIcon } from '@renderer/components/ProviderIcons';
+import type { ModelDefinition, ModelProvider } from '@shared/domain/models';
+import { providerMeta } from '@shared/domain/models';
+import type { ReasoningEffort } from '@shared/domain/workflow';
+
+interface ModelSelectorProps {
+  models: ReadonlyArray<ModelDefinition>;
+  selectedModelId?: string;
+  selectedReasoning?: ReasoningEffort;
+  onSelect: (model: ModelDefinition) => void;
+  onReasoningChange: (effort: ReasoningEffort | undefined) => void;
+  onClose: () => void;
+}
+
+const reasoningLevels: { value: ReasoningEffort; label: string; description: string }[] = [
+  { value: 'low', label: 'Low', description: 'Fast, concise' },
+  { value: 'medium', label: 'Med', description: 'Balanced' },
+  { value: 'high', label: 'High', description: 'Thorough' },
+  { value: 'xhigh', label: 'Max', description: 'Exhaustive' },
+];
+
+interface ProviderGroup {
+  provider: ModelProvider | 'other';
+  label: string;
+  models: ModelDefinition[];
+}
+
+export function ModelSelector({
+  models,
+  selectedModelId,
+  selectedReasoning,
+  onSelect,
+  onReasoningChange,
+  onClose,
+}: ModelSelectorProps) {
+  const containerRef = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    const handleClickOutside = (e: MouseEvent) => {
+      if (containerRef.current && !containerRef.current.contains(e.target as Node)) {
+        onClose();
+      }
+    };
+    const handleEscape = (e: KeyboardEvent) => {
+      if (e.key === 'Escape') {
+        e.stopPropagation();
+        onClose();
+      }
+    };
+
+    document.addEventListener('mousedown', handleClickOutside);
+    document.addEventListener('keydown', handleEscape, true);
+    return () => {
+      document.removeEventListener('mousedown', handleClickOutside);
+      document.removeEventListener('keydown', handleEscape, true);
+    };
+  }, [onClose]);
+
+  const selectedModel = models.find((m) => m.id === selectedModelId);
+  const supportedEfforts = selectedModel?.supportedReasoningEfforts;
+
+  // Group models by provider
+  const groups = useMemo((): ProviderGroup[] => {
+    const providerOrder = providerMeta.map((p) => p.id);
+    const providerLabels = new Map(providerMeta.map((p) => [p.id, p.label]));
+    const grouped = new Map<string, ModelDefinition[]>();
+
+    for (const model of models) {
+      const key = model.provider ?? 'other';
+      const list = grouped.get(key) ?? [];
+      list.push(model);
+      grouped.set(key, list);
+    }
+
+    const result: ProviderGroup[] = [];
+    for (const providerId of providerOrder) {
+      const providerModels = grouped.get(providerId);
+      if (providerModels) {
+        result.push({
+          provider: providerId,
+          label: providerLabels.get(providerId) ?? providerId,
+          models: providerModels,
+        });
+      }
+    }
+
+    // Any models without a known provider
+    const other = grouped.get('other');
+    if (other) {
+      result.push({ provider: 'other', label: 'Other', models: other });
+    }
+
+    return result;
+  }, [models]);
+
+  return (
+    <div
+      ref={containerRef}
+      className="qp-dropdown-enter absolute top-full left-3 right-3 z-10 mt-1 overflow-hidden rounded-xl border border-[var(--color-border)] bg-[var(--color-surface-1)] shadow-2xl shadow-black/50"
+      role="listbox"
+      aria-label="Select model"
+    >
+      {/* Model list — grouped by provider */}
+      <div className="max-h-[280px] overflow-y-auto overscroll-contain p-1.5">
+        {groups.map((group, gi) => (
+          <div key={group.provider}>
+            {gi > 0 && <div className="mx-2 my-1 border-t border-[var(--color-border-subtle)]/50" />}
+
+            {/* Provider header */}
+            <div className="flex items-center gap-1.5 px-2.5 pt-2 pb-1">
+              {group.provider !== 'other' && (
+                <ProviderIcon provider={group.provider} className="size-3" />
+              )}
+              <span className="text-[10px] font-semibold tracking-wider text-[var(--color-text-muted)] uppercase">
+                {group.label}
+              </span>
+            </div>
+
+            {/* Models in this provider group */}
+            {group.models.map((model) => {
+              const isSelected = model.id === selectedModelId;
+              const tierLabel = model.tier === 'premium' ? 'PRO' : model.tier === 'fast' ? 'FAST' : undefined;
+              const tierColor = model.tier === 'premium'
+                ? 'text-amber-400 bg-amber-400/10'
+                : model.tier === 'fast'
+                  ? 'text-emerald-400 bg-emerald-400/10'
+                  : '';
+
+              return (
+                <button
+                  key={model.id}
+                  onClick={() => onSelect(model)}
+                  className={`flex w-full items-center gap-2 rounded-lg px-3 py-[7px] text-left transition-colors ${
+                    isSelected
+                      ? 'bg-[var(--color-accent-muted)] text-[var(--color-text-primary)]'
+                      : 'text-[var(--color-text-secondary)] hover:bg-[var(--color-surface-2)] hover:text-[var(--color-text-primary)]'
+                  }`}
+                  type="button"
+                  role="option"
+                  aria-selected={isSelected}
+                >
+                  <span className="flex-1 truncate text-[12px] font-medium">{model.name}</span>
+
+                  {tierLabel && (
+                    <span className={`rounded-[4px] px-1.5 py-px text-[8px] font-bold tracking-wider ${tierColor}`}>
+                      {tierLabel}
+                    </span>
+                  )}
+
+                  {model.supportedReasoningEfforts?.length ? (
+                    <Brain className="size-3 flex-none text-[var(--color-text-muted)]/60" aria-label="Supports reasoning" />
+                  ) : null}
+
+                  {isSelected && <Check className="size-3.5 flex-none text-[var(--color-accent)]" />}
+                </button>
+              );
+            })}
+          </div>
+        ))}
+      </div>
+
+      {/* Reasoning effort — only shown when selected model supports it */}
+      {supportedEfforts && supportedEfforts.length > 0 && (
+        <div className="border-t border-[var(--color-border-subtle)] px-3 py-2.5">
+          <div className="mb-2 flex items-center gap-1.5">
+            <Brain className="size-3 text-[var(--color-text-muted)]" />
+            <span className="text-[10px] font-semibold tracking-wider text-[var(--color-text-muted)] uppercase">
+              Reasoning Effort
+            </span>
+          </div>
+          <div className="flex gap-1">
+            {reasoningLevels
+              .filter((lvl) => supportedEfforts.includes(lvl.value))
+              .map((lvl) => {
+                const isActive = selectedReasoning === lvl.value;
+                return (
+                  <button
+                    key={lvl.value}
+                    onClick={() => onReasoningChange(isActive ? undefined : lvl.value)}
+                    className={`group flex-1 rounded-lg py-1.5 text-center transition-all ${
+                      isActive
+                        ? 'bg-[var(--color-accent)] text-white shadow-md shadow-[var(--color-accent)]/20'
+                        : 'bg-[var(--color-surface-2)] text-[var(--color-text-muted)] hover:bg-[var(--color-surface-3)] hover:text-[var(--color-text-secondary)]'
+                    }`}
+                    type="button"
+                    title={lvl.description}
+                  >
+                    <span className="text-[11px] font-semibold">{lvl.label}</span>
+                  </button>
+                );
+              })}
+          </div>
+        </div>
+      )}
+    </div>
+  );
+}

src/renderer/components/quick-prompt/QuickPromptActions.tsx

@@ -0,0 +1,44 @@
+import { ArrowRight, Trash2, X } from 'lucide-react';
+
+interface QuickPromptActionsProps {
+  onDiscard: () => void;
+  onClose: () => void;
+  onContinueInAryx: () => void;
+}
+
+export function QuickPromptActions({ onDiscard, onClose, onContinueInAryx }: QuickPromptActionsProps) {
+  return (
+    <div className="qp-actions-enter flex items-center gap-1.5 border-t border-[var(--color-border-subtle)]/60 px-4 py-2.5">
+      <button
+        onClick={onDiscard}
+        className="flex items-center gap-1.5 rounded-lg px-3 py-[6px] text-[11px] font-medium text-[var(--color-text-muted)] transition-colors hover:bg-[var(--color-status-error)]/8 hover:text-[var(--color-status-error)]"
+        type="button"
+        title="Delete this session permanently"
+      >
+        <Trash2 className="size-3" />
+        Discard
+      </button>
+
+      <button
+        onClick={onClose}
+        className="flex items-center gap-1.5 rounded-lg px-3 py-[6px] text-[11px] font-medium text-[var(--color-text-muted)] transition-colors hover:bg-[var(--color-surface-3)] hover:text-[var(--color-text-primary)]"
+        type="button"
+        title="Close and keep session for later"
+      >
+        <X className="size-3" />
+        Close
+      </button>
+
+      <div className="flex-1" />
+
+      <button
+        onClick={onContinueInAryx}
+        className="brand-gradient-bg flex items-center gap-1.5 rounded-lg px-4 py-[6px] text-[11px] font-semibold text-white shadow-sm shadow-[var(--color-accent)]/15 transition-all hover:shadow-md hover:shadow-[var(--color-accent)]/25 hover:brightness-110"
+        type="button"
+      >
+        Continue in Aryx
+        <ArrowRight className="size-3" />
+      </button>
+    </div>
+  );
+}

src/renderer/components/quick-prompt/QuickPromptApp.tsx

@@ -0,0 +1,317 @@
+import { useCallback, useEffect, useRef, useState } from 'react';
+
+import type { QuickPromptElectronApi, QuickPromptCapabilities } from '@shared/contracts/ipc';
+import type { SessionEventRecord } from '@shared/domain/event';
+import type { ReasoningEffort } from '@shared/domain/workflow';
+import type { ModelDefinition } from '@shared/domain/models';
+
+import { QuickPromptInput } from '@renderer/components/quick-prompt/QuickPromptInput';
+import { QuickPromptResponse } from '@renderer/components/quick-prompt/QuickPromptResponse';
+import { QuickPromptActions } from '@renderer/components/quick-prompt/QuickPromptActions';
+
+declare global {
+  interface Window {
+    quickPromptApi: QuickPromptElectronApi;
+  }
+}
+
+type PromptPhase = 'idle' | 'streaming' | 'complete' | 'error';
+
+/**
+ * Per-message state tracked by messageId, mirroring the main app's
+ * SessionRecord.messages model. This is necessary because the sidecar's
+ * fire-and-forget event handlers can emit events out of order — e.g.
+ * `message-complete` and `status: idle` can arrive before all
+ * `message-delta` events have been emitted.
+ */
+interface TrackedMessage {
+  content: string;
+  messageKind?: string;
+  authorName: string;
+  pending: boolean;
+  finalized: boolean;
+}
+
+/** Derive display values from tracked messages. */
+function deriveDisplay(messages: Map<string, TrackedMessage>) {
+  let content = '';
+  let thinkingContent = '';
+  let authorName = '';
+  let hasVisibleContent = false;
+  let allComplete = messages.size > 0;
+
+  for (const msg of messages.values()) {
+    if (msg.messageKind === 'thinking') {
+      if (msg.content) thinkingContent += (thinkingContent ? '\n' : '') + msg.content;
+    } else {
+      // Last non-thinking message wins as the response
+      content = msg.content;
+      authorName = msg.authorName;
+      if (msg.content.length > 0) hasVisibleContent = true;
+    }
+    if (msg.pending) allComplete = false;
+  }
+
+  return { content, thinkingContent, authorName, isComplete: allComplete && hasVisibleContent };
+}
+
+export function QuickPromptApp() {
+  const [phase, setPhase] = useState<PromptPhase>('idle');
+  const [displayContent, setDisplayContent] = useState('');
+  const [displayThinking, setDisplayThinking] = useState('');
+  const [displayAuthor, setDisplayAuthor] = useState('');
+  const [errorMessage, setErrorMessage] = useState<string>();
+  const [capabilities, setCapabilities] = useState<QuickPromptCapabilities>();
+  const [selectedModel, setSelectedModel] = useState<string>();
+  const [selectedReasoning, setSelectedReasoning] = useState<ReasoningEffort>();
+  const [visible, setVisible] = useState(false);
+
+  const sessionIdRef = useRef<string | null>(null);
+  const messagesRef = useRef<Map<string, TrackedMessage>>(new Map());
+  const api = window.quickPromptApi;
+
+  /** Push tracked-message state into React display state. */
+  const syncDisplay = useCallback(() => {
+    const display = deriveDisplay(messagesRef.current);
+    setDisplayContent(display.content);
+    setDisplayThinking(display.thinkingContent);
+    setDisplayAuthor(display.authorName);
+    return display;
+  }, []);
+
+  // Load capabilities on mount
+  useEffect(() => {
+    api.getCapabilities().then((caps) => {
+      setCapabilities(caps);
+      setSelectedModel(caps.defaultModel ?? caps.models[0]?.id);
+      setSelectedReasoning(caps.defaultReasoningEffort);
+    });
+  }, [api]);
+
+  // Subscribe to show/hide events from main process
+  useEffect(() => {
+    const offShow = api.onShow((theme: string) => {
+      const effective = theme === 'system'
+        ? (window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light')
+        : theme;
+      document.documentElement.dataset.theme = effective;
+
+      setVisible(true);
+      resetState();
+    });
+    const offHide = api.onHide(() => setVisible(false));
+    return () => {
+      offShow();
+      offHide();
+    };
+  }, [api]);
+
+  // Subscribe to session events (streaming) — processes events using
+  // message-by-ID tracking that tolerates out-of-order delivery.
+  useEffect(() => {
+    const off = api.onSessionEvent((event: SessionEventRecord) => {
+      const msgs = messagesRef.current;
+
+      if (event.kind === 'message-delta' && event.messageId && (event.contentDelta || event.content !== undefined)) {
+        const existing = msgs.get(event.messageId);
+
+        if (existing) {
+          // Skip deltas that arrive after message-complete replaced the
+          // content with the authoritative final version.
+          if (existing.finalized) return;
+
+          if (event.content !== undefined) {
+            existing.content = event.content;
+          } else if (event.contentDelta) {
+            existing.content += event.contentDelta;
+          }
+          existing.authorName = event.authorName ?? existing.authorName;
+        } else {
+          msgs.set(event.messageId, {
+            content: event.contentDelta ?? event.content ?? '',
+            messageKind: event.messageKind,
+            authorName: event.authorName ?? '',
+            pending: true,
+            finalized: false,
+          });
+        }
+
+        syncDisplay();
+        setPhase('streaming');
+
+      } else if (event.kind === 'message-complete' && event.messageId) {
+        const existing = msgs.get(event.messageId);
+        if (existing) {
+          if (event.content !== undefined) existing.content = event.content;
+          existing.pending = false;
+          existing.finalized = true;
+        } else {
+          msgs.set(event.messageId, {
+            content: event.content ?? '',
+            messageKind: undefined,
+            authorName: event.authorName ?? '',
+            pending: false,
+            finalized: true,
+          });
+        }
+
+        const display = syncDisplay();
+        if (display.isComplete) setPhase('complete');
+
+      } else if (event.kind === 'message-reclassified' && event.messageId && event.messageKind) {
+        const existing = msgs.get(event.messageId);
+        if (existing) {
+          existing.messageKind = event.messageKind;
+          syncDisplay();
+        }
+
+      } else if (event.kind === 'status' && event.status === 'idle') {
+        for (const msg of msgs.values()) {
+          msg.pending = false;
+        }
+        const display = syncDisplay();
+        if (display.isComplete) setPhase('complete');
+
+      } else if (event.kind === 'error') {
+        setErrorMessage(event.error ?? 'An unexpected error occurred.');
+        setPhase('error');
+      }
+    });
+    return off;
+  }, [api, syncDisplay]);
+
+  const resetState = useCallback(() => {
+    setPhase('idle');
+    setDisplayContent('');
+    setDisplayThinking('');
+    setDisplayAuthor('');
+    setErrorMessage(undefined);
+    sessionIdRef.current = null;
+    messagesRef.current = new Map();
+    api.getCapabilities().then((caps) => {
+      setCapabilities(caps);
+      setSelectedModel(caps.defaultModel ?? caps.models[0]?.id);
+      setSelectedReasoning(caps.defaultReasoningEffort);
+    });
+  }, [api]);
+
+  const handleSend = useCallback(async (content: string) => {
+    if (!content.trim() || phase === 'streaming') return;
+
+    setPhase('streaming');
+    setDisplayContent('');
+    setDisplayThinking('');
+    setDisplayAuthor('');
+    setErrorMessage(undefined);
+    messagesRef.current = new Map();
+
+    try {
+      const result = await api.send({
+        content,
+        model: selectedModel,
+        reasoningEffort: selectedReasoning,
+      });
+      sessionIdRef.current = result.sessionId;
+    } catch (err) {
+      setErrorMessage(err instanceof Error ? err.message : 'Failed to send message.');
+      setPhase('error');
+    }
+  }, [api, phase, selectedModel, selectedReasoning]);
+
+  const handleCancel = useCallback(() => {
+    api.cancelTurn();
+    setPhase('complete');
+  }, [api]);
+
+  const handleDiscard = useCallback(() => {
+    api.discard();
+    resetState();
+  }, [api, resetState]);
+
+  const handleClose = useCallback(() => {
+    api.close();
+    resetState();
+  }, [api, resetState]);
+
+  const handleContinueInAryx = useCallback(() => {
+    api.continueInAryx();
+    resetState();
+  }, [api, resetState]);
+
+  const handleModelChange = useCallback((model: ModelDefinition) => {
+    setSelectedModel(model.id);
+  }, []);
+
+  const handleReasoningChange = useCallback((effort: ReasoningEffort | undefined) => {
+    setSelectedReasoning(effort);
+  }, []);
+
+  // Global keyboard handler
+  useEffect(() => {
+    const handleKeyDown = (e: KeyboardEvent) => {
+      if (e.key === 'Escape') {
+        e.preventDefault();
+        if (phase === 'streaming') {
+          handleCancel();
+        } else if (phase === 'complete' || phase === 'error') {
+          handleClose();
+        } else {
+          api.close();
+        }
+      }
+    };
+
+    document.addEventListener('keydown', handleKeyDown);
+    return () => document.removeEventListener('keydown', handleKeyDown);
+  }, [phase, handleCancel, handleClose, api]);
+
+  if (!visible) return null;
+
+  const hasResponse = phase !== 'idle';
+  const resolvedModel = capabilities?.models.find((m) => m.id === selectedModel);
+
+  return (
+    <div className="qp-container flex h-screen w-screen items-start justify-center pt-0">
+      <div
+        className={`qp-panel qp-panel-enter flex w-full max-w-[680px] flex-col rounded-2xl ${
+          phase === 'streaming' ? 'qp-border-streaming' : hasResponse ? 'qp-border-complete' : 'qp-border-idle'
+        }`}
+        role="dialog"
+        aria-modal="true"
+        aria-label="Quick Prompt"
+      >
+        {/* Input area */}
+        <QuickPromptInput
+          onSend={handleSend}
+          onCancel={handleCancel}
+          phase={phase}
+          models={capabilities?.models}
+          selectedModel={resolvedModel}
+          selectedReasoning={selectedReasoning}
+          onModelChange={handleModelChange}
+          onReasoningChange={handleReasoningChange}
+        />
+
+        {/* Response area — grows dynamically */}
+        {hasResponse && (
+          <QuickPromptResponse
+            content={displayContent}
+            thinkingContent={displayThinking}
+            authorName={displayAuthor}
+            phase={phase}
+            error={errorMessage}
+          />
+        )}
+
+        {/* Action bar */}
+        {(phase === 'complete' || phase === 'error') && (
+          <QuickPromptActions
+            onDiscard={handleDiscard}
+            onClose={handleClose}
+            onContinueInAryx={handleContinueInAryx}
+          />
+        )}
+      </div>
+    </div>
+  );
+}

src/renderer/components/quick-prompt/QuickPromptInput.tsx

@@ -0,0 +1,154 @@
+import { useCallback, useEffect, useRef, useState } from 'react';
+import { ChevronDown, Loader2, Square, Sparkles } from 'lucide-react';
+
+import type { ModelDefinition } from '@shared/domain/models';
+import type { ReasoningEffort } from '@shared/domain/workflow';
+
+import { ModelSelector } from '@renderer/components/quick-prompt/ModelSelector';
+
+type PromptPhase = 'idle' | 'streaming' | 'complete' | 'error';
+
+interface QuickPromptInputProps {
+  onSend: (content: string) => void;
+  onCancel: () => void;
+  phase: PromptPhase;
+  models?: ReadonlyArray<ModelDefinition>;
+  selectedModel?: ModelDefinition;
+  selectedReasoning?: ReasoningEffort;
+  onModelChange: (model: ModelDefinition) => void;
+  onReasoningChange: (effort: ReasoningEffort | undefined) => void;
+}
+
+export function QuickPromptInput({
+  onSend,
+  onCancel,
+  phase,
+  models,
+  selectedModel,
+  selectedReasoning,
+  onModelChange,
+  onReasoningChange,
+}: QuickPromptInputProps) {
+  const [value, setValue] = useState('');
+  const [modelSelectorOpen, setModelSelectorOpen] = useState(false);
+  const textareaRef = useRef<HTMLTextAreaElement>(null);
+
+  // Auto-focus when phase resets to idle
+  useEffect(() => {
+    if (phase === 'idle') {
+      setTimeout(() => textareaRef.current?.focus(), 50);
+    }
+  }, [phase]);
+
+  // Auto-resize textarea
+  useEffect(() => {
+    const el = textareaRef.current;
+    if (!el) return;
+    el.style.height = 'auto';
+    el.style.height = `${Math.min(el.scrollHeight, 120)}px`;
+  }, [value]);
+
+  const handleKeyDown = useCallback(
+    (e: React.KeyboardEvent) => {
+      if (e.key === 'Enter' && !e.shiftKey) {
+        e.preventDefault();
+        if (phase === 'idle' && value.trim()) {
+          onSend(value);
+        }
+      }
+    },
+    [onSend, value, phase],
+  );
+
+  const reasoningLabel = selectedReasoning
+    ? selectedReasoning === 'xhigh' ? 'xHigh' : selectedReasoning.charAt(0).toUpperCase() + selectedReasoning.slice(1)
+    : undefined;
+
+  return (
+    <div className="relative flex flex-col">
+      {/* Primary input area */}
+      <div className="flex items-start gap-3 px-5 pt-4 pb-2">
+        <div className="mt-1 flex-none">
+          {phase === 'streaming' ? (
+            <Loader2 className="size-[18px] animate-spin text-[var(--color-accent)]" aria-label="Processing" />
+          ) : (
+            <Sparkles className="size-[18px] text-[var(--color-text-muted)]" />
+          )}
+        </div>
+
+        <textarea
+          ref={textareaRef}
+          value={value}
+          onChange={(e) => setValue(e.target.value)}
+          onKeyDown={handleKeyDown}
+          placeholder="Ask anything…"
+          disabled={phase === 'streaming'}
+          rows={1}
+          className="min-h-[28px] max-h-[120px] flex-1 resize-none bg-transparent font-[var(--font-body)] text-[14px] leading-[1.6] text-[var(--color-text-primary)] outline-none placeholder:text-[var(--color-text-muted)]/60 disabled:opacity-40"
+          aria-label="Quick prompt input"
+        />
+
+        {phase === 'streaming' && (
+          <button
+            onClick={onCancel}
+            className="mt-0.5 flex flex-none items-center gap-1.5 rounded-md border border-[var(--color-border)] bg-[var(--color-surface-2)] px-2.5 py-1 text-[11px] font-medium text-[var(--color-text-secondary)] transition hover:border-[var(--color-status-error)]/40 hover:bg-[var(--color-status-error)]/10 hover:text-[var(--color-status-error)]"
+            type="button"
+            aria-label="Stop generating"
+          >
+            <Square className="size-2.5 fill-current" />
+            Stop
+          </button>
+        )}
+      </div>
+
+      {/* Footer bar: model selector + shortcuts */}
+      <div className="flex items-center gap-2 border-t border-[var(--color-border-subtle)]/60 px-5 py-2">
+        <button
+          onClick={() => setModelSelectorOpen((prev) => !prev)}
+          className={`flex items-center gap-1.5 rounded-lg px-2.5 py-1.5 text-[11px] transition ${
+            modelSelectorOpen
+              ? 'bg-[var(--color-accent-muted)] text-[var(--color-text-accent)]'
+              : 'text-[var(--color-text-muted)] hover:bg-[var(--color-surface-3)] hover:text-[var(--color-text-secondary)]'
+          }`}
+          type="button"
+          aria-haspopup="listbox"
+          aria-expanded={modelSelectorOpen}
+        >
+          <span className="max-w-[160px] truncate font-medium">{selectedModel?.name ?? 'Select model'}</span>
+          {reasoningLabel && (
+            <span className="rounded-[4px] bg-[var(--color-accent)]/15 px-1.5 py-px text-[9px] font-semibold tracking-wide text-[var(--color-text-accent)] uppercase">
+              {reasoningLabel}
+            </span>
+          )}
+          <ChevronDown className={`size-3 transition-transform ${modelSelectorOpen ? 'rotate-180' : ''}`} />
+        </button>
+
+        <span className="ml-auto flex items-center gap-3 text-[10px] text-[var(--color-text-muted)] select-none opacity-50">
+          <kbd className="rounded border border-[var(--color-border-subtle)] bg-[var(--color-surface-2)] px-1 py-px font-mono text-[9px]">
+            ↵
+          </kbd>
+          <span>Send</span>
+          <kbd className="rounded border border-[var(--color-border-subtle)] bg-[var(--color-surface-2)] px-1 py-px font-mono text-[9px]">
+            Esc
+          </kbd>
+          <span>Dismiss</span>
+        </span>
+      </div>
+
+      {/* Model selector dropdown */}
+      {modelSelectorOpen && models && (
+        <ModelSelector
+          models={models}
+          selectedModelId={selectedModel?.id}
+          selectedReasoning={selectedReasoning}
+          onSelect={(model) => {
+            onModelChange(model);
+            setModelSelectorOpen(false);
+          }}
+          onReasoningChange={onReasoningChange}
+          onClose={() => setModelSelectorOpen(false)}
+        />
+      )}
+    </div>
+  );
+}

src/renderer/components/quick-prompt/QuickPromptResponse.tsx

@@ -0,0 +1,89 @@
+import { useEffect, useRef } from 'react';
+import ReactMarkdown from 'react-markdown';
+import remarkGfm from 'remark-gfm';
+import { AlertCircle, Brain } from 'lucide-react';
+
+type PromptPhase = 'idle' | 'streaming' | 'complete' | 'error';
+
+interface QuickPromptResponseProps {
+  content: string;
+  thinkingContent: string;
+  authorName: string;
+  phase: PromptPhase;
+  error?: string;
+}
+
+export function QuickPromptResponse({
+  content,
+  thinkingContent,
+  phase,
+  error,
+}: QuickPromptResponseProps) {
+  const scrollRef = useRef<HTMLDivElement>(null);
+
+  // Auto-scroll to bottom during streaming
+  useEffect(() => {
+    if (phase === 'streaming' && scrollRef.current) {
+      scrollRef.current.scrollTop = scrollRef.current.scrollHeight;
+    }
+  }, [content, thinkingContent, phase]);
+
+  return (
+    <div
+      ref={scrollRef}
+      className="qp-response-enter max-h-[min(50vh,480px)] overflow-y-auto overscroll-contain border-t border-[var(--color-border-subtle)]/60"
+    >
+      {/* Error state */}
+      {phase === 'error' && error && (
+        <div className="flex items-start gap-3 px-5 py-4">
+          <AlertCircle className="mt-0.5 size-4 flex-none text-[var(--color-status-error)]" />
+          <div>
+            <p className="text-[12px] font-semibold text-[var(--color-status-error)]">Something went wrong</p>
+            <p className="mt-1 text-[12px] leading-relaxed text-[var(--color-status-error)]/80">{error}</p>
+          </div>
+        </div>
+      )}
+
+      {/* Thinking block — compact collapsed visualization */}
+      {thinkingContent && (
+        <div className="mx-5 mt-3 mb-1 rounded-lg border border-[var(--color-border-subtle)]/50 bg-[var(--color-surface-0)]/40 px-3.5 py-2.5">
+          <div className="flex items-center gap-2 text-[10px] font-semibold tracking-wide text-[var(--color-text-muted)] uppercase">
+            <Brain className="size-3" />
+            <span>Reasoning</span>
+            {phase === 'streaming' && !content && (
+              <span className="ml-0.5 flex gap-[3px]">
+                <span className="thinking-dot inline-block size-[3px] rounded-full bg-[var(--color-text-muted)]" />
+                <span className="thinking-dot inline-block size-[3px] rounded-full bg-[var(--color-text-muted)]" />
+                <span className="thinking-dot inline-block size-[3px] rounded-full bg-[var(--color-text-muted)]" />
+              </span>
+            )}
+          </div>
+          <p className="mt-1 text-[11px] leading-relaxed text-[var(--color-text-muted)]/70 italic line-clamp-2">
+            {thinkingContent.slice(-200)}
+          </p>
+        </div>
+      )}
+
+      {/* Main response content */}
+      {content && (
+        <div className="px-5 py-3.5">
+          <div className="markdown-content text-[13px] leading-[1.7] text-[var(--color-text-primary)]">
+            <ReactMarkdown remarkPlugins={[remarkGfm]}>{content}</ReactMarkdown>
+          </div>
+        </div>
+      )}
+
+      {/* Streaming indicator when no content yet */}
+      {phase === 'streaming' && !content && !thinkingContent && (
+        <div className="flex items-center gap-3 px-5 py-4">
+          <span className="flex gap-[3px]">
+            <span className="thinking-dot inline-block size-[5px] rounded-full bg-[var(--color-accent)]" />
+            <span className="thinking-dot inline-block size-[5px] rounded-full bg-[var(--color-accent)]" />
+            <span className="thinking-dot inline-block size-[5px] rounded-full bg-[var(--color-accent)]" />
+          </span>
+          <span className="text-[12px] text-[var(--color-text-muted)]">Generating…</span>
+        </div>
+      )}
+    </div>
+  );
+}

src/renderer/lib/sessionWorkspace.ts

@@ -2,7 +2,6 @@ import type { SessionEventRecord } from '@shared/domain/event';
 import { upsertSessionRunRecord } from '@shared/domain/runTimeline';
 import type { ChatMessageRecord, SessionRecord } from '@shared/domain/session';
 import type { WorkspaceState } from '@shared/domain/workspace';
-import { mergeStreamingText } from '@shared/utils/streamingText';
 
 export function applySessionEventWorkspace(
   current: WorkspaceState | undefined,
@@ -45,6 +44,8 @@ function applySessionEvent(session: SessionRecord, event: SessionEventRecord): S
       return applyMessageReclassifiedEvent(session, event);
     case 'run-updated':
       return applyRunUpdatedEvent(session, event);
+    case 'assistant-intent':
+      return applyAssistantIntentEvent(session, event);
     default:
       return session;
   }
@@ -63,6 +64,7 @@ function applyStatusEvent(session: SessionRecord, event: SessionEventRecord): Se
     ...session,
     status: event.status,
     lastError: event.status === 'error' ? session.lastError : undefined,
+    currentIntent: event.status === 'idle' ? undefined : session.currentIntent,
     updatedAt: event.occurredAt,
   };
 }
@@ -86,14 +88,19 @@ function applyMessageDeltaEvent(session: SessionRecord, event: SessionEventRecor
     return session;
   }
 
-  const resolvedContent = event.content ?? event.contentDelta ?? '';
   const messageIndex = session.messages.findIndex((message) => message.id === event.messageId);
   if (messageIndex >= 0) {
     const existing = session.messages[messageIndex];
+    // The main process resolves content authoritatively; prefer event.content
+    // (full assembled text) and fall back to simple append for backward compat.
+    const nextContent =
+      event.content !== undefined
+        ? event.content
+        : existing.content + (event.contentDelta ?? '');
     const nextMessage: ChatMessageRecord = {
       ...existing,
       authorName: event.authorName ?? existing.authorName,
-      content: event.content ?? mergeStreamingText(existing.content, resolvedContent),
+      content: nextContent,
       pending: true,
     };
 
@@ -114,6 +121,8 @@ function applyMessageDeltaEvent(session: SessionRecord, event: SessionEventRecor
     };
   }
 
+  const resolvedContent = event.content ?? event.contentDelta ?? '';
+
   // Auto-complete any previously pending assistant messages so only
   // the new message shows the "Thinking" indicator.
   const completedMessages = session.messages.map((message) =>
@@ -217,3 +226,15 @@ function applyRunUpdatedEvent(session: SessionRecord, event: SessionEventRecord)
     updatedAt: event.occurredAt,
   };
 }
+
+function applyAssistantIntentEvent(session: SessionRecord, event: SessionEventRecord): SessionRecord {
+  if (!event.intent || session.currentIntent === event.intent) {
+    return session;
+  }
+
+  return {
+    ...session,
+    currentIntent: event.intent,
+    updatedAt: event.occurredAt,
+  };
+}

src/renderer/quickprompt.html

@@ -0,0 +1,18 @@
+<!doctype html>
+<html lang="en" style="background: transparent;">
+  <head>
+    <meta charset="UTF-8" />
+    <meta
+      name="viewport"
+      content="width=device-width, initial-scale=1.0"
+    />
+    <title>Aryx Quick Prompt</title>
+  </head>
+  <body data-quickprompt style="margin: 0; background: transparent; overflow: hidden;">
+    <div id="root"></div>
+    <script
+      type="module"
+      src="./quickprompt.tsx"
+    ></script>
+  </body>
+</html>

src/renderer/quickprompt.tsx

@@ -0,0 +1,20 @@
+import { StrictMode } from 'react';
+import { createRoot } from 'react-dom/client';
+
+import '@fontsource-variable/outfit';
+import '@fontsource-variable/dm-sans';
+import '@fontsource-variable/jetbrains-mono';
+
+import { QuickPromptApp } from '@renderer/components/quick-prompt/QuickPromptApp';
+import '@renderer/styles.css';
+
+const container = document.getElementById('root');
+if (!container) {
+  throw new Error('Could not find the root element.');
+}
+
+createRoot(container).render(
+  <StrictMode>
+    <QuickPromptApp />
+  </StrictMode>,
+);

src/renderer/styles.css

@@ -689,9 +689,124 @@ body {
   .update-banner-enter,
   .turn-activity-enter,
   .turn-activity-row,
-  .turn-activity-row[role="separator"] {
+  .turn-activity-row[role="separator"],
+  .qp-panel-enter,
+  .qp-response-enter,
+  .qp-actions-enter,
+  .qp-dropdown-enter {
     animation: none;
   }
+
+  .qp-border-streaming {
+    animation: none;
+    border-color: var(--color-accent);
+  }
+}
+
+/* ── Quick Prompt — Glass Command Bar ────────────────────────── */
+
+/* Override body/root backgrounds when inside the quickprompt window so the
+   transparent BrowserWindow doesn't show a colored rectangle behind the
+   rounded panel. The data attribute is set on the <body> in quickprompt.html. */
+body[data-quickprompt],
+body[data-quickprompt] #root {
+  background: transparent !important;
+  min-height: 0 !important;
+}
+
+html:has(body[data-quickprompt]) {
+  background: transparent !important;
+}
+
+.qp-container {
+  background: transparent;
+}
+
+.qp-panel {
+  background: var(--color-surface-1);
+  /* No box-shadow — on Windows transparent windows, shadows paint visibly
+     on the transparent canvas and create a visible dark rectangle. */
+  transition: border-color 0.3s ease;
+}
+
+/* Border states */
+.qp-border-idle {
+  border: 1px solid var(--color-glass-border);
+}
+
+.qp-border-complete {
+  border: 1px solid var(--color-border-glow);
+}
+
+/* Animated breathing border during streaming */
+@keyframes qp-border-breathe {
+  0%, 100% {
+    border-color: rgba(36, 92, 249, 0.35);
+  }
+  50% {
+    border-color: rgba(138, 41, 230, 0.4);
+  }
+}
+
+.qp-border-streaming {
+  border: 1px solid rgba(36, 92, 249, 0.35);
+  animation: qp-border-breathe 2.5s ease-in-out infinite;
+}
+
+/* Panel entrance animation */
+@keyframes qp-panel-in {
+  from {
+    opacity: 0;
+    transform: scale(0.96) translateY(-6px);
+  }
+}
+
+.qp-panel-enter {
+  animation: qp-panel-in 0.2s cubic-bezier(0.16, 1, 0.3, 1);
+}
+
+/* Response area entrance */
+@keyframes qp-response-in {
+  from {
+    opacity: 0;
+    max-height: 0;
+  }
+  to {
+    opacity: 1;
+    max-height: min(55vh, 520px);
+  }
+}
+
+.qp-response-enter {
+  animation: qp-response-in 0.25s cubic-bezier(0.16, 1, 0.3, 1);
+}
+
+/* Action bar entrance */
+@keyframes qp-actions-in {
+  from {
+    opacity: 0;
+    transform: translateY(4px);
+  }
+}
+
+.qp-actions-enter {
+  animation: qp-actions-in 0.2s cubic-bezier(0.16, 1, 0.3, 1) 0.05s both;
+}
+
+/* Dropdown entrance — opens downward */
+@keyframes qp-dropdown-in {
+  from {
+    opacity: 0;
+    transform: translateY(-6px) scale(0.97);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0) scale(1);
+  }
+}
+
+.qp-dropdown-enter {
+  animation: qp-dropdown-in 0.15s cubic-bezier(0.16, 1, 0.3, 1);
 }
 
 /* ── Markdown prose styles ───────────────────────────────────── */
@@ -800,3 +915,42 @@ body {
   max-width: 100%;
   border-radius: 0.5rem;
 }
+
+.markdown-content code {
+  font-family: var(--font-mono);
+  font-size: 0.85em;
+  background: var(--color-surface-2);
+  border: 1px solid var(--color-border-subtle);
+  border-radius: 0.25rem;
+  padding: 0.15em 0.35em;
+  color: var(--color-text-primary);
+}
+
+.markdown-content pre {
+  background: var(--color-surface-0);
+  border: 1px solid var(--color-border);
+  border-radius: 0.5rem;
+  padding: 0.875em 1em;
+  overflow-x: auto;
+  margin-top: 0.75em;
+  margin-bottom: 0.75em;
+}
+
+.markdown-content pre code {
+  background: none;
+  border: none;
+  padding: 0;
+  font-size: 0.8125rem;
+  line-height: 1.6;
+}
+
+.markdown-content a {
+  color: var(--color-text-accent);
+  text-decoration: underline;
+  text-decoration-color: var(--color-text-accent);
+  text-underline-offset: 2px;
+}
+
+.markdown-content a:hover {
+  color: var(--color-accent-hover);
+}

src/shared/contracts/channels.ts

@@ -83,4 +83,18 @@ export const ipcChannels = {
   updateStatus: 'app:update-status',
   getQuota: 'sidecar:get-quota',
   trayCreateScratchpad: 'tray:create-scratchpad',
+
+  // Quick Prompt
+  quickPromptSend: 'quick-prompt:send',
+  quickPromptDiscard: 'quick-prompt:discard',
+  quickPromptClose: 'quick-prompt:close',
+  quickPromptContinueInAryx: 'quick-prompt:continue-in-aryx',
+  quickPromptCancelTurn: 'quick-prompt:cancel-turn',
+  quickPromptSetSettings: 'quick-prompt:set-settings',
+  quickPromptGetSettings: 'quick-prompt:get-settings',
+  quickPromptGetCapabilities: 'quick-prompt:get-capabilities',
+  quickPromptSessionCreated: 'quick-prompt:session-created',
+  quickPromptSessionEvent: 'quick-prompt:session-event',
+  quickPromptShow: 'quick-prompt:show',
+  quickPromptHide: 'quick-prompt:hide',
 } as const;

src/shared/contracts/ipc.ts

@@ -19,11 +19,13 @@ import type {
   McpServerDefinition,
   SessionToolingSelection,
   AppearanceTheme,
+  QuickPromptSettings,
 } from '@shared/domain/tooling';
 import type { WorkspaceState } from '@shared/domain/workspace';
 import type { ChatMessageAttachment } from '@shared/domain/attachment';
 import type { ProjectPromptInvocation } from '@shared/domain/projectCustomization';
 import type { WorkspaceAgentDefinition } from '@shared/domain/workspaceAgent';
+import type { ModelDefinition } from '@shared/domain/models';
 
 export interface CreateSessionInput {
   projectId: string;
@@ -381,9 +383,42 @@ export interface ElectronApi {
   onSessionEvent(listener: (event: SessionEventRecord) => void): () => void;
   onUpdateStatus(listener: (status: UpdateStatus) => void): () => void;
   onTrayCreateScratchpad(listener: () => void): () => void;
+  getQuickPromptSettings(): Promise<QuickPromptSettings>;
+  setQuickPromptSettings(settings: Partial<QuickPromptSettings>): Promise<void>;
 }
 
 export interface RendererSelectionState {
   selectedProject?: ProjectRecord;
   selectedWorkflow?: WorkflowDefinition;
 }
+
+// --- Quick Prompt contracts ---
+
+export interface QuickPromptSendInput {
+  content: string;
+  model?: string;
+  reasoningEffort?: ReasoningEffort;
+}
+
+export interface QuickPromptSessionInfo {
+  sessionId: string;
+}
+
+export interface QuickPromptCapabilities {
+  models: ReadonlyArray<ModelDefinition>;
+  defaultModel?: string;
+  defaultReasoningEffort?: ReasoningEffort;
+}
+
+export interface QuickPromptElectronApi {
+  send(input: QuickPromptSendInput): Promise<QuickPromptSessionInfo>;
+  discard(): Promise<void>;
+  close(): Promise<void>;
+  continueInAryx(): Promise<void>;
+  cancelTurn(): Promise<void>;
+  getCapabilities(): Promise<QuickPromptCapabilities>;
+  setSettings(settings: Partial<QuickPromptSettings>): Promise<void>;
+  onSessionEvent(listener: (event: SessionEventRecord) => void): () => void;
+  onShow(listener: (theme: string) => void): () => void;
+  onHide(listener: () => void): () => void;
+}

src/shared/domain/event.ts

@@ -31,6 +31,8 @@ export type SessionEventKind =
   | 'session-compaction'
   | 'pending-messages-modified'
   | 'assistant-usage'
+  | 'assistant-intent'
+  | 'reasoning-delta'
   | 'workflow-diagnostic';
 
 export type SubagentEventKind = 'started' | 'completed' | 'failed' | 'selected' | 'deselected';
@@ -102,6 +104,13 @@ export interface SessionEventRecord {
   usageTotalNanoAiu?: number;
   usageQuotaSnapshots?: Record<string, QuotaSnapshot>;
 
+  // Assistant intent fields
+  intent?: string;
+
+  // Reasoning delta fields
+  reasoningId?: string;
+  reasoningDelta?: string;
+
   // Workflow diagnostic fields
   diagnosticSeverity?: WorkflowDiagnosticSeverity;
   diagnosticKind?: WorkflowDiagnosticKind;

src/shared/domain/session.ts

@@ -85,6 +85,7 @@ export interface SessionRecord {
   pendingPlanReview?: PendingPlanReviewRecord;
   pendingMcpAuth?: PendingMcpAuthRecord;
   runs: SessionRunRecord[];
+  currentIntent?: string;
 }
 
 function normalizeOptionalString(value?: string): string | undefined {

src/shared/domain/tooling.ts

@@ -61,6 +61,20 @@ export interface WorkspaceToolingSettings {
 
 export type AppearanceTheme = 'dark' | 'light' | 'system';
 
+export interface QuickPromptSettings {
+  enabled: boolean;
+  hotkey: string;
+  defaultModel?: string;
+  defaultReasoningEffort?: 'low' | 'medium' | 'high' | 'xhigh';
+}
+
+export function createDefaultQuickPromptSettings(): QuickPromptSettings {
+  return {
+    enabled: true,
+    hotkey: 'Alt+Shift+C',
+  };
+}
+
 export interface WorkspaceSettings {
   theme: AppearanceTheme;
   tooling: WorkspaceToolingSettings;
@@ -70,6 +84,7 @@ export interface WorkspaceSettings {
   notificationsEnabled?: boolean;
   minimizeToTray?: boolean;
   gitAutoRefreshEnabled?: boolean;
+  quickPrompt?: QuickPromptSettings;
 }
 
 export interface SessionToolingSelection {
@@ -215,6 +230,7 @@ export function normalizeWorkspaceSettings(settings?: Partial<WorkspaceSettings>
     ...(settings?.notificationsEnabled !== undefined ? { notificationsEnabled: settings.notificationsEnabled } : {}),
     ...(settings?.minimizeToTray !== undefined ? { minimizeToTray: settings.minimizeToTray } : {}),
     ...(settings?.gitAutoRefreshEnabled !== undefined ? { gitAutoRefreshEnabled: settings.gitAutoRefreshEnabled } : {}),
+    ...(settings?.quickPrompt !== undefined ? { quickPrompt: settings.quickPrompt } : {}),
   };
 }
 

tests/renderer/sessionWorkspace.test.ts

@@ -351,4 +351,355 @@ describe('session workspace helpers', () => {
 
     expect(result).toBe(workspace);
   });
+
+  test('uses resolved content from main process and falls back to simple append', () => {
+    // When content is present (main process resolved it), use it directly
+    const first = applySessionEventWorkspace(createWorkspace(), {
+      sessionId: 'session-1',
+      kind: 'message-delta',
+      occurredAt: '2026-03-23T00:00:01.000Z',
+      messageId: 'assistant-1',
+      authorName: 'Agent',
+      contentDelta: 'Hello',
+      content: 'Hello',
+    } satisfies SessionEventRecord);
+
+    // Main process sends full resolved content on every delta
+    const second = applySessionEventWorkspace(first, {
+      sessionId: 'session-1',
+      kind: 'message-delta',
+      occurredAt: '2026-03-23T00:00:02.000Z',
+      messageId: 'assistant-1',
+      authorName: 'Agent',
+      contentDelta: ' world',
+      content: 'Hello world',
+    } satisfies SessionEventRecord);
+
+    expect(second?.sessions[0].messages[0].content).toBe('Hello world');
+
+    // Backward compat: if content is missing, simple append of contentDelta
+    const fallback = applySessionEventWorkspace(second, {
+      sessionId: 'session-1',
+      kind: 'message-delta',
+      occurredAt: '2026-03-23T00:00:03.000Z',
+      messageId: 'assistant-1',
+      authorName: 'Agent',
+      contentDelta: '!',
+    } satisfies SessionEventRecord);
+
+    expect(fallback?.sessions[0].messages[0].content).toBe('Hello world!');
+  });
+
+  test('sets currentIntent from assistant-intent events', () => {
+    const workspace = createWorkspace();
+    const updated = applySessionEventWorkspace(workspace, {
+      sessionId: 'session-1',
+      kind: 'assistant-intent',
+      occurredAt: '2026-03-23T00:00:01.000Z',
+      intent: 'Exploring codebase',
+    } satisfies SessionEventRecord);
+
+    expect(updated?.sessions[0].currentIntent).toBe('Exploring codebase');
+  });
+
+  test('clears currentIntent when session transitions to idle', () => {
+    let workspace = applySessionEventWorkspace(createWorkspace(), {
+      sessionId: 'session-1',
+      kind: 'status',
+      occurredAt: '2026-03-23T00:00:01.000Z',
+      status: 'running',
+    } satisfies SessionEventRecord);
+
+    workspace = applySessionEventWorkspace(workspace, {
+      sessionId: 'session-1',
+      kind: 'assistant-intent',
+      occurredAt: '2026-03-23T00:00:02.000Z',
+      intent: 'Writing tests',
+    } satisfies SessionEventRecord);
+
+    expect(workspace?.sessions[0].currentIntent).toBe('Writing tests');
+
+    workspace = applySessionEventWorkspace(workspace, {
+      sessionId: 'session-1',
+      kind: 'status',
+      occurredAt: '2026-03-23T00:00:03.000Z',
+      status: 'idle',
+    } satisfies SessionEventRecord);
+
+    expect(workspace?.sessions[0].currentIntent).toBeUndefined();
+  });
+
+  test('ignores duplicate assistant-intent events', () => {
+    const workspace = applySessionEventWorkspace(createWorkspace(), {
+      sessionId: 'session-1',
+      kind: 'assistant-intent',
+      occurredAt: '2026-03-23T00:00:01.000Z',
+      intent: 'Exploring codebase',
+    } satisfies SessionEventRecord);
+
+    const duplicate = applySessionEventWorkspace(workspace, {
+      sessionId: 'session-1',
+      kind: 'assistant-intent',
+      occurredAt: '2026-03-23T00:00:02.000Z',
+      intent: 'Exploring codebase',
+    } satisfies SessionEventRecord);
+
+    expect(duplicate).toBe(workspace);
+  });
+
+  test('preserves currentIntent when status changes to running', () => {
+    let workspace = applySessionEventWorkspace(createWorkspace(), {
+      sessionId: 'session-1',
+      kind: 'assistant-intent',
+      occurredAt: '2026-03-23T00:00:01.000Z',
+      intent: 'Analyzing code',
+    } satisfies SessionEventRecord);
+
+    workspace = applySessionEventWorkspace(workspace, {
+      sessionId: 'session-1',
+      kind: 'status',
+      occurredAt: '2026-03-23T00:00:02.000Z',
+      status: 'running',
+    } satisfies SessionEventRecord);
+
+    expect(workspace?.sessions[0].currentIntent).toBe('Analyzing code');
+  });
+
+  /* ── Streaming regression tests ──────────────────────────── */
+
+  test('thinking-to-response transition: reclassified message stays hidden, new message becomes final', () => {
+    // Step 1: first message streams as normal assistant content
+    let ws = applySessionEventWorkspace(createWorkspace(), {
+      sessionId: 'session-1',
+      kind: 'message-delta',
+      occurredAt: '2026-03-23T00:00:01.000Z',
+      messageId: 'assistant-1',
+      authorName: 'Agent',
+      contentDelta: 'Let me look into this...',
+      content: 'Let me look into this...',
+    } satisfies SessionEventRecord);
+
+    // Step 2: reclassified as thinking (the agent decided to search first)
+    ws = applySessionEventWorkspace(ws, {
+      sessionId: 'session-1',
+      kind: 'message-reclassified',
+      occurredAt: '2026-03-23T00:00:02.000Z',
+      messageId: 'assistant-1',
+      messageKind: 'thinking',
+    } satisfies SessionEventRecord);
+
+    expect(ws?.sessions[0].messages[0]).toMatchObject({
+      id: 'assistant-1',
+      messageKind: 'thinking',
+      pending: true,
+    });
+
+    // Step 3: a new actual response message starts streaming
+    ws = applySessionEventWorkspace(ws, {
+      sessionId: 'session-1',
+      kind: 'message-delta',
+      occurredAt: '2026-03-23T00:00:03.000Z',
+      messageId: 'assistant-2',
+      authorName: 'Agent',
+      contentDelta: 'Here is the answer.',
+      content: 'Here is the answer.',
+    } satisfies SessionEventRecord);
+
+    // The thinking message should be auto-completed, new one is pending
+    expect(ws?.sessions[0].messages).toHaveLength(2);
+    expect(ws?.sessions[0].messages[0]).toMatchObject({
+      id: 'assistant-1',
+      messageKind: 'thinking',
+      pending: false,
+    });
+    expect(ws?.sessions[0].messages[1]).toMatchObject({
+      id: 'assistant-2',
+      content: 'Here is the answer.',
+      pending: true,
+    });
+  });
+
+  test('concurrent multi-message streaming keeps messages independent', () => {
+    // Two different assistant messages stream interleaved (e.g. multi-agent)
+    let ws = applySessionEventWorkspace(createWorkspace(), {
+      sessionId: 'session-1',
+      kind: 'message-delta',
+      occurredAt: '2026-03-23T00:00:01.000Z',
+      messageId: 'msg-agent-a',
+      authorName: 'Architect',
+      contentDelta: 'Design: ',
+      content: 'Design: ',
+    } satisfies SessionEventRecord);
+
+    ws = applySessionEventWorkspace(ws, {
+      sessionId: 'session-1',
+      kind: 'message-delta',
+      occurredAt: '2026-03-23T00:00:02.000Z',
+      messageId: 'msg-agent-a',
+      authorName: 'Architect',
+      contentDelta: 'Use modules.',
+      content: 'Design: Use modules.',
+    } satisfies SessionEventRecord);
+
+    // Complete one message, verify others are unaffected
+    ws = applySessionEventWorkspace(ws, {
+      sessionId: 'session-1',
+      kind: 'message-complete',
+      occurredAt: '2026-03-23T00:00:04.000Z',
+      messageId: 'msg-agent-a',
+      authorName: 'Architect',
+      content: 'Design: Use modules.',
+    } satisfies SessionEventRecord);
+
+    expect(ws?.sessions[0].messages).toHaveLength(1);
+    expect(ws?.sessions[0].messages[0]).toMatchObject({
+      id: 'msg-agent-a',
+      content: 'Design: Use modules.',
+      pending: false,
+    });
+  });
+
+  test('run-updated replaces existing run by id and handles new runs', () => {
+    const runV1: SessionRunRecord = {
+      id: 'run-1',
+      requestId: 'turn-1',
+      projectId: 'project-1',
+      projectPath: 'C:\\workspace',
+      workspaceKind: 'project',
+      workflowId: 'workflow-1',
+      workflowName: 'Review',
+      workflowMode: 'sequential',
+      triggerMessageId: 'msg-user-1',
+      startedAt: '2026-03-23T00:00:01.000Z',
+      status: 'running',
+      agents: [],
+      events: [],
+    };
+
+    let ws = applySessionEventWorkspace(createWorkspace(), {
+      sessionId: 'session-1',
+      kind: 'run-updated',
+      occurredAt: '2026-03-23T00:00:01.000Z',
+      run: runV1,
+    } satisfies SessionEventRecord);
+
+    expect(ws?.sessions[0].runs).toHaveLength(1);
+    expect(ws?.sessions[0].runs[0].status).toBe('running');
+
+    // Run updated with new status and events
+    const runV2: SessionRunRecord = {
+      ...runV1,
+      status: 'completed',
+      events: [
+        {
+          id: 'evt-1',
+          kind: 'run-started',
+          occurredAt: '2026-03-23T00:00:01.000Z',
+          status: 'completed',
+        },
+      ],
+    };
+
+    ws = applySessionEventWorkspace(ws, {
+      sessionId: 'session-1',
+      kind: 'run-updated',
+      occurredAt: '2026-03-23T00:00:02.000Z',
+      run: runV2,
+    } satisfies SessionEventRecord);
+
+    // Should replace, not duplicate
+    expect(ws?.sessions[0].runs).toHaveLength(1);
+    expect(ws?.sessions[0].runs[0].status).toBe('completed');
+    expect(ws?.sessions[0].runs[0].events).toHaveLength(1);
+  });
+
+  test('full turn lifecycle: intent → deltas → complete → idle clears intent', () => {
+    let ws = applySessionEventWorkspace(createWorkspace(), {
+      sessionId: 'session-1',
+      kind: 'status',
+      occurredAt: '2026-03-23T00:00:00.000Z',
+      status: 'running',
+    } satisfies SessionEventRecord);
+
+    ws = applySessionEventWorkspace(ws, {
+      sessionId: 'session-1',
+      kind: 'assistant-intent',
+      occurredAt: '2026-03-23T00:00:01.000Z',
+      intent: 'Exploring codebase',
+    } satisfies SessionEventRecord);
+
+    ws = applySessionEventWorkspace(ws, {
+      sessionId: 'session-1',
+      kind: 'message-delta',
+      occurredAt: '2026-03-23T00:00:02.000Z',
+      messageId: 'assistant-1',
+      authorName: 'Agent',
+      contentDelta: 'Found the issue.',
+      content: 'Found the issue.',
+    } satisfies SessionEventRecord);
+
+    // Intent survives during message streaming
+    expect(ws?.sessions[0].currentIntent).toBe('Exploring codebase');
+    expect(ws?.sessions[0].messages[0].pending).toBe(true);
+
+    ws = applySessionEventWorkspace(ws, {
+      sessionId: 'session-1',
+      kind: 'assistant-intent',
+      occurredAt: '2026-03-23T00:00:03.000Z',
+      intent: 'Fixing bug',
+    } satisfies SessionEventRecord);
+
+    expect(ws?.sessions[0].currentIntent).toBe('Fixing bug');
+
+    ws = applySessionEventWorkspace(ws, {
+      sessionId: 'session-1',
+      kind: 'message-complete',
+      occurredAt: '2026-03-23T00:00:04.000Z',
+      messageId: 'assistant-1',
+      authorName: 'Agent',
+      content: 'Found the issue. Here is the fix.',
+    } satisfies SessionEventRecord);
+
+    // Intent still active until idle
+    expect(ws?.sessions[0].currentIntent).toBe('Fixing bug');
+
+    ws = applySessionEventWorkspace(ws, {
+      sessionId: 'session-1',
+      kind: 'status',
+      occurredAt: '2026-03-23T00:00:05.000Z',
+      status: 'idle',
+    } satisfies SessionEventRecord);
+
+    expect(ws?.sessions[0].currentIntent).toBeUndefined();
+    expect(ws?.sessions[0].status).toBe('idle');
+    expect(ws?.sessions[0].messages[0].content).toBe('Found the issue. Here is the fix.');
+    expect(ws?.sessions[0].messages[0].pending).toBe(false);
+  });
+
+  test('message-complete content overrides previously streamed content', () => {
+    let ws = applySessionEventWorkspace(createWorkspace(), {
+      sessionId: 'session-1',
+      kind: 'message-delta',
+      occurredAt: '2026-03-23T00:00:01.000Z',
+      messageId: 'assistant-1',
+      authorName: 'Agent',
+      contentDelta: 'Partial draft...',
+      content: 'Partial draft...',
+    } satisfies SessionEventRecord);
+
+    // Backend sends final authoritative content on completion
+    ws = applySessionEventWorkspace(ws, {
+      sessionId: 'session-1',
+      kind: 'message-complete',
+      occurredAt: '2026-03-23T00:00:02.000Z',
+      messageId: 'assistant-1',
+      authorName: 'Agent',
+      content: 'The complete, polished final answer with all details.',
+    } satisfies SessionEventRecord);
+
+    expect(ws?.sessions[0].messages[0]).toMatchObject({
+      content: 'The complete, polished final answer with all details.',
+      pending: false,
+    });
+  });
 });

website/src/pages/index.astro

@@ -354,6 +354,16 @@ import Base from '../layouts/Base.astro';
               <p class="mt-0.5 text-xs leading-relaxed text-warm-400">Minimize to tray, quick-launch scratchpads, see running session count.</p>
             </div>
           </div>
+          <!-- Quick Prompt -->
+          <div class="group flex gap-3.5 rounded-xl px-3 py-2.5 transition hover:bg-card/60" data-reveal data-reveal-d="6">
+            <div class="mt-0.5 flex size-8 shrink-0 items-center justify-center rounded-lg bg-accent/[0.07] text-accent transition group-hover:bg-accent/[0.12]">
+              <svg class="size-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 10V3L4 14h7v7l9-11h-7z"></path></svg>
+            </div>
+            <div>
+              <h4 class="text-sm font-medium text-warm-50">Quick Prompt</h4>
+              <p class="mt-0.5 text-xs leading-relaxed text-warm-400">Global hotkey summons a floating AI prompt from any app. Discard, close, or continue in Aryx.</p>
+            </div>
+          </div>
           <!-- Desktop Notifications -->
           <div class="group flex gap-3.5 rounded-xl px-3 py-2.5 transition hover:bg-card/60" data-reveal data-reveal-d="7">
             <div class="mt-0.5 flex size-8 shrink-0 items-center justify-center rounded-lg bg-brand/[0.07] text-brand transition group-hover:bg-brand/[0.12]">