Implements Phase 1 of A2A protocol support as discussed in #12007:
- A2A types (agent config, task, message, artifact types)
- A2aHub service for managing agent connections
- delegate_to_agent tool for delegating tasks to external agents
- Manual configuration via a2a_settings.json (global/project)
- Configurable headers for authentication (JSON key-value pairs)
- Integration with system prompt, tool parser, and ClineProvider
- A2A tool group added to code mode
- Tests for A2aHub service
* feat: add per-task file-based history store for cross-instance safety
Implement TaskHistoryStore service that stores each task's HistoryItem
as an individual JSON file in its existing task directory. This prevents
silent data loss when multiple VS Code windows write to the shared
globalState taskHistory array concurrently.
Key changes:
- New TaskHistoryStore class with per-task file writes via safeWriteJson
- Index file (_index.json) for fast startup reads
- Reconciliation logic to detect and fix drift between instances
- fs.watch for cross-instance reactivity
- Debounced index writes (2s window) for streaming performance
- Migration from globalState on first startup
- Write-through to globalState during transition period
- Fallback lookups from globalState for backward compatibility
Files created:
- src/core/task-persistence/TaskHistoryStore.ts
- src/core/task-persistence/__tests__/TaskHistoryStore.spec.ts
- src/core/task-persistence/__tests__/TaskHistoryStore.crossInstance.spec.ts
Files modified:
- src/shared/globalFileNames.ts (added historyItem, historyIndex)
- src/core/task-persistence/index.ts (export TaskHistoryStore)
- src/core/webview/ClineProvider.ts (integrate store, remove write lock)
- Test files updated for new store-based approach
* fix: address review feedback - reconcile lock, init promise, write-through serialization
- reconcile() now runs through withLock() to prevent interleaving with
upsert/delete at async boundaries
- Added initialized promise so callers can await store readiness before
reading (getStateToPostToWebview now awaits it)
- Write-through to globalState now happens inside the store lock via
onWrite callback, preventing concurrent call races on the transition
period fallback
- Removed separate updateGlobalState("taskHistory") calls from
ClineProvider since the onWrite callback handles it serialized
* fix: add TaskHistoryStore to task-persistence mock in Task.persistence.spec.ts
The test mocks task-persistence with an explicit factory that was
missing the new TaskHistoryStore export, causing all 9 tests to fail
with "No TaskHistoryStore export is defined on the mock".
* perf: debounce globalState write-through to avoid full-array writes on every mutation
Instead of writing the entire HistoryItem[] array to globalState on
every upsert/delete (expensive with 5000+ tasks), the write-through
is now debounced with a 5-second window. Per-task file writes remain
immediate (~200 bytes each). The globalState is flushed on dispose
to ensure no data loss on shutdown.
This makes the hot path during streaming (token count updates) write
only the per-task file, not the full array.
---------
Co-authored-by: Roo Code <roomote@roocode.com>
Revert to pre-AI-SDK state (commit 67e568f6b)
This commit reverts the codebase to the state before AI SDK migration work began.
Target commit: 67e568f6b - refactor: replace fetch_instructions with skill tool and built-in skills (#10913)
Date: January 29, 2026
This removes approximately 152 commits of AI SDK migration work.
A follow-up PR will add back bug fixes and features that are unrelated to AI SDK.
Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>
* fix: race conditions in subtask delegation system
Comprehensive fix for race conditions and error handling gaps in the subtask
delegation system. Addresses multiple failure modes that could leave parent
tasks permanently stuck in 'delegated' status, causing nested subtasks to hang.
Key fixes:
- Remove initialStatus from taskMetadata rebuild (eliminates status overwrites)
- Persist delegation metadata to per-task files (resolves globalState eviction)
- Add delegationInProgress mutex guard (prevents concurrent delegation ops)
- TOCTOU race fixes with fresh re-reads before writes
- Abort-aware pWaitFor predicate (prevents false 60s timeout on user input)
- Remove silent .catch(() => {}) — all errors now logged unless task is aborting
- Single-attempt delegation with parent repair on failure (no retry band-aids)
- Cancel debouncedEmitTokenUsage in dispose() (prevents zombie callbacks)
- new_task isolation truncation for parallel tool calls
* fix: write all 6 delegation fields in every saveDelegationMeta call site
* fix: align delegation tests with single-attempt implementation (no retry)
* feat: Add file context tracking system
This commit adds a comprehensive file context tracking system that monitors file operations (reads, edits) by both Roo and users. The system helps prevent stale context issues and improves checkpoint management.
Key features:
- Track files accessed via tools, mentions, or edits
- Monitor file changes outside of Roo using file watchers
- Store file operation metadata with timestamps
- Trigger checkpoints automatically when files are modified
- Prevent false positives by distinguishing between Roo and user edits
The implementation includes:
- New FileContextTracker class to manage file operations
- Type definitions for file metadata tracking
- Integration with all file-related tools
- File mention tracking in the mentions system
- Improved checkpoint triggering based on file modifications
* Update src/core/context-tracking/FileContextTracker.ts
Co-authored-by: ellipsis-dev[bot] <65095814+ellipsis-dev[bot]@users.noreply.github.com>
* Update src/core/context-tracking/FileContextTracker.ts
Co-authored-by: ellipsis-dev[bot] <65095814+ellipsis-dev[bot]@users.noreply.github.com>
* test: Add mocks for getFileContextTracker in Cline tests
---------
Co-authored-by: ellipsis-dev[bot] <65095814+ellipsis-dev[bot]@users.noreply.github.com>
Co-authored-by: Matt Rubens <mrubens@users.noreply.github.com>
* Replace hardcoded custom modes filename with GlobalFileNames constant
* Remove 'cline' prefix from mcpSettings filename
* Use GlobalFileNames.customModes in modes.ts
* replace two more `cline_mcp_settings` with `mcp_settings` in tests.
* feat: add settings file migration for new file naming convention
- Implement migrateSettings function to rename legacy settings files to new format
- Migrate cline_custom_modes.json to new custom modes filename
- Migrate cline_mcp_settings.json to new MCP settings filename
- Add TODO to remove migration code in September 2025 (6 months after implementation)
- Make activate function async to support migration on startup
* Add associated changeset
* removed unused import
* refactor: move migrateSettings to dedicated utility file
- Extract migrateSettings function from extension.ts to src/utils/migrateSettings.ts
- Update extension.ts to import and use the extracted function
- Update tests to use the real implementation
- Improve dependency injection by passing outputChannel as parameter
- Enhance maintainability by isolating temporary migration code (to be removed Sept 2025)
* Update src/extension.ts
---------
Co-authored-by: Matt Rubens <mrubens@users.noreply.github.com>
