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feat(web): add list branches tool to MCP and Ask Sourcebot - #1609
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Avoids refname:short emitting heads/<name> when a tag shares a branch name, which broke isDefault and isIndexed for that branch.
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🚧 Files skipped from review as they are similar to previous changes (1)
Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. WalkthroughAdds a ChangesList branches
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk:⚪ Minimal · up to This PR adds branch listing to MCP and Ask Sourcebot with filtering, pagination, and rendering changes; no actionable merge-blocking risk remains at the current head after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant ChatOrMCPClient
participant listBranchesDefinition
participant listBranches
participant LocalGitRepository
ChatOrMCPClient->>listBranchesDefinition: submit repo and pagination parameters
listBranchesDefinition->>listBranches: execute branch query
listBranches->>LocalGitRepository: read and sort local branches
LocalGitRepository-->>listBranches: branch metadata
listBranches-->>listBranchesDefinition: paginated response and metadata
listBranchesDefinition-->>ChatOrMCPClient: serialized branch results
Possibly related PRs
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 2
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Inline comments:
In `@docs/docs/features/mcp-server.mdx`:
- Around line 380-382: Rewrite the branch-listing prose in present-tense second
person, addressing the reader directly instead of using “Lists branches” and
“Each branch in the response includes.” Preserve the existing details about
sorting, snapshot freshness, and the isDefault and isIndexed fields.
In `@packages/web/src/features/tools/listBranches.ts`:
- Around line 33-35: Update the isServiceError(response) handling in
listBranches so external tool callers receive only a user-safe, generic error
message; do not rethrow response.message because it may contain repoPath,
filesystem details, or raw simple-git command output. Log the detailed response
error server-side using the existing logging mechanism, then throw the sanitized
error while preserving the current success path.
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ℹ️ Review info
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Configuration used: Organization UI
Review profile: CHILL
Plan: Pro Plus
Run ID: 8e90da62-a3f2-4245-a2d9-75ac449e8b2a
📒 Files selected for processing (15)
CHANGELOG.mddocs/docs/features/mcp-server.mdxpackages/web/src/ee/features/chat/agent.test.tspackages/web/src/ee/features/chat/components/chatThread/detailsCard.test.tsxpackages/web/src/ee/features/chat/components/chatThread/detailsCard.tsxpackages/web/src/ee/features/chat/components/chatThread/tools/listBranchesToolComponent.tsxpackages/web/src/ee/features/chat/tools/index.tspackages/web/src/ee/features/mcp/server.tspackages/web/src/features/git/index.tspackages/web/src/features/git/listBranchesApi.test.tspackages/web/src/features/git/listBranchesApi.tspackages/web/src/features/git/schemas.tspackages/web/src/features/tools/index.tspackages/web/src/features/tools/listBranches.tspackages/web/src/features/tools/listBranches.txt
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jsourcebot
commented
Aug 19, 2026
  Few screenshots of using the feature in Ask |
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Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.
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Reviewed by Cursor Bugbot for commit a5a0a4a. Configure here.
| if (isServiceError(response)) { | ||
| logger.error('list_branches failed', { serviceError: response }); | ||
| throw new Error('Failed to list branches.'); |
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Tool hides list_branches error details
Medium Severity
On failure, list_branches logs the ServiceError and throws a generic Failed to list branches. message. Ask Sourcebot and MCP therefore never receive the API’s not found or clone-unavailable text, unlike sibling tools that rethrow response.message. Clients cannot tell a missing repo from a git failure and cannot correct the repo argument.
Reviewed by Cursor Bugbot for commit a5a0a4a. Configure here.
Fixes SOU-1764
Summary
Testing
Build note
Note
Cursor Bugbot is generating a summary for commit 7f3f6a0. Configure here.
Summary by CodeRabbit
New Features
list_branchestool for discovering repository branches.Documentation