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Pull request overview
This PR adds support for a new SessionStart hook that allows hooks to provide additional context when a chat session begins. The implementation mirrors the existing SubagentStart hook pattern, executing on the first turn of regular chat sessions while SubagentStart continues to execute for subagent requests.
Changes:
- Added
SessionStartHookInputandSessionStartHookOutputinterface definitions for the new hook type - Implemented
executeSessionStartHookmethod following the same pattern asexecuteSubagentStartHook - Added
runStartHooksmethod to execute start hooks (SessionStart or SubagentStart) before the main request loop - Integrated start hook execution in
defaultIntentRequestHandlerto run before user prompt submission
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.
| File | Description |
|---|---|
| src/platform/chat/common/chatHookService.ts | Adds TypeScript interface definitions for SessionStart hook input/output |
| src/extension/intents/node/toolCallingLoop.ts | Implements SessionStart hook execution logic and adds runStartHooks method |
| src/extension/prompt/node/defaultIntentRequestHandler.ts | Integrates start hook execution before the main tool calling loop |
TylerLeonhardt
approved these changes
Feb 6, 2026
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