[BUG FIX] Preserve model context across agent handoffs and background tasks #208
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Fixes #191 This commit addresses three critical issues with model selection: 1. **Background Agent Manager Model Preservation** - Updated BackgroundTask and LaunchInput types to include parentModel field - Modified manager.ts to capture and store parent model context - Updated notifyParentSession() to pass model field when resuming parent session - Background tasks now preserve the user's selected model across continuations 2. **Librarian Agent Factory Pattern** - Converted librarian agent from static config to factory function - Added createLibrarianAgent(model?: string) with configurable model parameter - Maintained backward compatibility with exported librarianAgent constant - Updated utils.ts to use the new factory function 3. **Background Task Tool Model Context Capture** - Updated background_task tool to capture current model context - Uses findNearestMessageWithFields() to get model info from parent session - Passes parentModel to manager.launch() for proper context preservation Changes: - src/features/background-agent/types.ts: Add parentModel field to BackgroundTask and LaunchInput - src/features/background-agent/manager.ts: Store and preserve parent model context - src/agents/librarian.ts: Convert to factory pattern with configurable model - src/agents/utils.ts: Use createLibrarianAgent factory - src/tools/background-task/tools.ts: Capture and pass model context - assets/oh-my-opencode.schema.json: Regenerated schema Impact: - Users with OAuth providers (Google, Anthropic) will now have their model selection preserved - Background agents no longer revert to hardcoded defaults - Agent model configuration is now more flexible and user-controllable Testing: - All existing tests pass (20/20) - Build succeeds with no errors - Backward compatibility maintained
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Summary
Fixes #191 - Resolves model selection reverting to hardcoded Anthropic models instead of preserving user's OAuth/configured model across agent handoffs and background task continuations.
Changes
1. Background Agent Manager Model Preservation
src/features/background-agent/types.ts: AddedparentModelfield toBackgroundTaskandLaunchInputinterfacessrc/features/background-agent/manager.ts:parentModelwith fallback tofindNearestMessageWithFields()for resilience2. Librarian Agent Factory Pattern
src/agents/librarian.ts:createLibrarianAgent(model?: string)DEFAULT_MODELconstantlibrarianAgentconstantsrc/agents/utils.ts: Uses newcreateLibrarianAgentfactory3. Background Task Tool Model Context Capture
src/tools/background-task/tools.ts:findNearestMessageWithFields()parentModeltomanager.launch()for proper context preservationImpact
✅ Fixes
🔧 Technical Improvements
🛡️ Backward Compatibility
Testing
Files Changed
src/features/background-agent/types.ts- Add model context fieldssrc/features/background-agent/manager.ts- Preserve and pass model contextsrc/agents/librarian.ts- Convert to factory with configurable modelsrc/agents/utils.ts- Use librarian factorysrc/tools/background-task/tools.ts- Capture and pass model contextassets/oh-my-opencode.schema.json- Regenerated JSON schemaRelated Issues
Closes #191
Additional Notes
This is a targeted fix addressing the core issue without over-engineering. The solution:
Future work could include making all agents use factory patterns and adding global model persistence configuration options, but this PR focuses on fixing the immediate bug.