fix(web): disambiguate MCP language model selection for ask_codebase (#1137) - #1622
fix(web): disambiguate MCP language model selection for ask_codebase (#1137)#1622pranav718 wants to merge 3 commits into
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Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. WalkthroughAdded a reusable helper for configured language-model selection. Updated MCP ChangesLanguage-model selection
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This PR fixes valid MCP model selections without a display name while rejecting ambiguous or unconfigured choices with clear errors; no actionable merge-blocking risk remains after normal checks and review. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Linked Issues checkExplanation The implementation addresses issue Full details: Out of Scope Changes checkExplanation The changelog includes an entry for live repository indexing runtime in the syncing badge, but no related objective or code change appears in the linked issue or pull request scope. The MCP model-selection changes are in scope. Full details: Docstring CoverageExplanation No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 3 files. (1 skipped: 1 unsupported.)
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Inline comments:
In `@CHANGELOG.md`:
- Line 11: Update the changelog entry’s trailing GitHub reference to use the
actual pull-request ID and /pull/<id> URL instead of the current /issues/1137
link, preserving the existing description.
In `@packages/web/src/features/chat/selectConfiguredLanguageModel.ts`:
- Line 51: Update the displayName branch in selectConfiguredLanguageModel to
check displayName !== undefined rather than truthiness, so an explicitly
supplied empty string selects the exact matching configuration instead of
triggering ambiguity; add coverage for the empty-name case.
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CHANGELOG.mdpackages/web/src/ee/features/mcp/askCodebase.tspackages/web/src/features/chat/selectConfiguredLanguageModel.test.tspackages/web/src/features/chat/selectConfiguredLanguageModel.ts
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fixes #1137
what was happening
when calling
ask_codebaseover mcp with an explicitlanguageModel(or through/api/chat/blocking), it was failing with a 400 saying the model isn't configured.the issue was that
getLanguageModelKeygenerates${provider}-${model}-${displayName}. since mcp clients often don't passdisplayName(or only send{ provider, model }), the lookup ended up comparing againstundefinedand failed even if the model was inconfig.json.how this fixes previous attempts (#1408, #1414)
i saw the earlier discussion on #1408 where just dropping
displayNamebroke setups having multiple configs for the same model (like different personas / reasoning efforts).to properly handle brendan's feedback from earlier:
displayNameis provided: matches exact(provider, model, displayName).displayNameis omitted:(provider, model): picks it automatically (fixes the mcp bug).(provider, model): throws a clean 400 listing the availabledisplayNames so the caller knows what to pass to disambiguate.(paired with an ai assistant to help write out the tests and verify the edge cases).
tests
selectConfiguredLanguageModel.test.tscovering all branches (single candidate, exact match with display name, multiple candidate disambiguation error, unconfigured model, default fallback) -> 9/9 passedyarn workspace @sourcebot/web test) -> 139 test files passed (1,446 tests)yarn workspace @sourcebot/web lint) -> clean, 0 errorsNote
Low Risk
Localized validation change on the programmatic ask path with explicit error handling and unit tests; interactive chat routing is unchanged.
Overview
Fixes MCP
ask_codebase(and the sharedaskCodebasepath) rejecting valid{ provider, model }requests because selection usedgetLanguageModelKey, which requireddisplayNameto line up.selectConfiguredLanguageModelcentralizes that logic: default to the first configured model when none is requested; withdisplayName, require an exact triple match; without it, auto-pick whenprovider/modelis unique and return a 400 listing availabledisplayNamevalues when multiple configs share the same model.askCodebasenow calls this helper instead of inline matching. Unit tests cover the branches; the changelog records the fix.Reviewed by Cursor Bugbot for commit 687fee1. Bugbot is set up for automated code reviews on this repo. Configure here.
Summary by cubic
Fixes MCP
ask_codebaserejecting explicit language model selection whendisplayNameis omitted, by matching uniquely on provider and model, returning a 400 with available names when configurations are ambiguous, and preserving the first-model fallback when no model is requested.Bug Fixes
provider/model/displayNamematches remain supported, and empty-stringdisplayNameis preserved in disambiguation messages.Written for commit 687fee1. Summary will update on new commits.
Summary by CodeRabbit
ask_codebase.