fix: block tools for handoff triage\n\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

sidecar/src/Eryx.AgentHost/Services/CopilotAgentBundle.cs

@@ -56,7 +56,7 @@ internal sealed class CopilotAgentBundle : IAsyncDisposable
                 Streaming = true,
             };
 
-            if (isScratchpad)
+            if (ShouldDisableSessionTools(command.Pattern, definition, command.WorkspaceKind))
             {
                 sessionConfig.AvailableTools = [];
             }
@@ -90,6 +90,25 @@ internal sealed class CopilotAgentBundle : IAsyncDisposable
         return bundle;
     }
 
+    internal static bool ShouldDisableSessionTools(
+        PatternDefinitionDto pattern,
+        PatternAgentDefinitionDto definition,
+        string workspaceKind)
+    {
+        if (string.Equals(workspaceKind, "scratchpad", StringComparison.OrdinalIgnoreCase))
+        {
+            return true;
+        }
+
+        if (!string.Equals(pattern.Mode, "handoff", StringComparison.OrdinalIgnoreCase))
+        {
+            return false;
+        }
+
+        PatternHandoffTopology topology = PatternGraphResolver.ResolveHandoff(pattern);
+        return string.Equals(definition.Id, topology.EntryAgentId, StringComparison.OrdinalIgnoreCase);
+    }
+
     public Workflow BuildWorkflow(PatternDefinitionDto pattern)
     {
         return pattern.Mode switch