feat: add MCP and LSP tooling support

Add global MCP/LSP settings, per-session Activity toggles, sidecar runtime integration, tests, and documentation updates.

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

src/shared/contracts/channels.ts

@@ -8,6 +8,11 @@ export const ipcChannels = {
   savePattern: 'patterns:save',
   deletePattern: 'patterns:delete',
   setPatternFavorite: 'patterns:set-favorite',
+  saveMcpServer: 'tooling:mcp:save',
+  deleteMcpServer: 'tooling:mcp:delete',
+  saveLspProfile: 'tooling:lsp:save',
+  deleteLspProfile: 'tooling:lsp:delete',
+  updateSessionTooling: 'sessions:update-tooling',
   createSession: 'sessions:create',
   duplicateSession: 'sessions:duplicate',
   renameSession: 'sessions:rename',

src/shared/contracts/ipc.ts

@@ -3,6 +3,11 @@ import type { PatternDefinition, ReasoningEffort } from '@shared/domain/pattern'
 import type { ProjectRecord } from '@shared/domain/project';
 import type { QuerySessionsInput, SessionQueryResult } from '@shared/domain/sessionLibrary';
 import type { SessionEventRecord } from '@shared/domain/event';
+import type {
+  LspProfileDefinition,
+  McpServerDefinition,
+  SessionToolingSelection,
+} from '@shared/domain/tooling';
 import type { WorkspaceState } from '@shared/domain/workspace';
 
 export interface CreateSessionInput {
@@ -49,6 +54,18 @@ export interface SetPatternFavoriteInput {
   isFavorite: boolean;
 }
 
+export interface SaveMcpServerInput {
+  server: McpServerDefinition;
+}
+
+export interface SaveLspProfileInput {
+  profile: LspProfileDefinition;
+}
+
+export interface UpdateSessionToolingInput extends SessionToolingSelection {
+  sessionId: string;
+}
+
 export interface ElectronApi {
   describeSidecarCapabilities(): Promise<SidecarCapabilities>;
   refreshSidecarCapabilities(): Promise<SidecarCapabilities>;
@@ -58,6 +75,11 @@ export interface ElectronApi {
   refreshProjectGitContext(projectId?: string): Promise<WorkspaceState>;
   savePattern(input: SavePatternInput): Promise<WorkspaceState>;
   deletePattern(patternId: string): Promise<WorkspaceState>;
+  saveMcpServer(input: SaveMcpServerInput): Promise<WorkspaceState>;
+  deleteMcpServer(serverId: string): Promise<WorkspaceState>;
+  saveLspProfile(input: SaveLspProfileInput): Promise<WorkspaceState>;
+  deleteLspProfile(profileId: string): Promise<WorkspaceState>;
+  updateSessionTooling(input: UpdateSessionToolingInput): Promise<WorkspaceState>;
   createSession(input: CreateSessionInput): Promise<WorkspaceState>;
   duplicateSession(input: DuplicateSessionInput): Promise<WorkspaceState>;
   renameSession(input: RenameSessionInput): Promise<WorkspaceState>;

src/shared/contracts/sidecar.ts

@@ -73,10 +73,47 @@ export interface RunTurnCommand {
   workspaceKind?: 'project' | 'scratchpad';
   pattern: PatternDefinition;
   messages: ChatMessageRecord[];
+  tooling?: RunTurnToolingConfig;
 }
 
 export type SidecarCommand = DescribeCapabilitiesCommand | ValidatePatternCommand | RunTurnCommand;
 
+export interface RunTurnLocalMcpServerConfig {
+  id: string;
+  name: string;
+  transport: 'local';
+  tools: string[];
+  timeoutMs?: number;
+  command: string;
+  args: string[];
+  cwd?: string;
+}
+
+export interface RunTurnRemoteMcpServerConfig {
+  id: string;
+  name: string;
+  transport: 'http' | 'sse';
+  tools: string[];
+  timeoutMs?: number;
+  url: string;
+}
+
+export type RunTurnMcpServerConfig = RunTurnLocalMcpServerConfig | RunTurnRemoteMcpServerConfig;
+
+export interface RunTurnLspProfileConfig {
+  id: string;
+  name: string;
+  command: string;
+  args: string[];
+  languageId: string;
+  fileExtensions: string[];
+}
+
+export interface RunTurnToolingConfig {
+  mcpServers: RunTurnMcpServerConfig[];
+  lspProfiles: RunTurnLspProfileConfig[];
+}
+
 export interface CapabilitiesEvent {
   type: 'capabilities';
   requestId: string;