Fix build from breaking chat participant API change#8415
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Pull request overview
This PR fixes a breaking change in the VS Code chat participant API where the request.tools Map changed from using string keys (tool names) to using tool object keys (LanguageModelToolInformation). Additionally, it updates several VS Code proposed API type definitions to reflect upstream changes.
Changes:
- Fixed
request.toolsusage to use tool objects as Map keys instead of tool names - Updated type definitions for chat sessions, participants, and context providers
- Added new API surface for chat session items, workspace edits, and tool invocation streaming
- Deprecated old session ID properties in favor of session resource URIs
Reviewed changes
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Show a summary per file
| File | Description |
|---|---|
| src/lm/participants.ts | Fixed breaking API change by using tool objects as Map keys instead of tool.name strings |
| src/@types/vscode.proposed.chatSessionsProvider.d.ts | Updated chat session provider API definitions with new controllers, collections, and deprecated timing properties; contains a critical bug on line 408 |
| src/@types/vscode.proposed.chatParticipantPrivate.d.ts | Updated with deprecated sessionId, new sessionResource, and subagent properties; removed CustomAgentsProvider interface |
| src/@types/vscode.proposed.chatParticipantAdditions.d.ts | Added workspace edit support, tool invocation streaming, token usage reporting; replaced prepareToolInvocation with beginToolInvocation/updateToolInvocation |
| src/@types/vscode.proposed.chatContextProvider.d.ts | Updated documentation for chat context provider activation events and usage |
chrmarti
approved these changes
Jan 23, 2026
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