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 2 commits into
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Included review availability: Your plan provides up to 8 included reviews per hour; 6 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: 🔵 Low · up to Requests that omit displayName now resolve automatically for MCP and blocking chat, while the regular chat endpoint still requires the full configured key; this can produce inconsistent 400 behavior across endpoints for the same request shape. The PR is otherwise localized and mergeable with owner awareness of this contract difference. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Linked Issues checkExplanation The changes satisfy issue 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.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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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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1 issue found across 4 files
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Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.
<file name="packages/web/src/features/chat/selectConfiguredLanguageModel.ts">
<violation number="1" location="packages/web/src/features/chat/selectConfiguredLanguageModel.ts:87">
P1: When duplicate configs include an unnamed model, the error advertises `'(default)'` as a selector that the exact-match branch can never match. Make the unnamed configuration selectable with a defined sentinel, or reject unnamed configs when `(provider, model)` is duplicated.</violation>
</file>
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Fix all with cubic | Re-trigger cubic
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1 issue found across 3 files (changes from recent commits).
Prompt for AI agents (unresolved issues)
Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.
<file name="packages/web/src/features/chat/selectConfiguredLanguageModel.ts">
<violation number="1" location="packages/web/src/features/chat/selectConfiguredLanguageModel.ts:73">
P2: When matching configurations include an unnamed or empty-name entry alongside named entries, this hint hides that entry and tells callers to specify only the listed names. Preserve empty-string names and explicitly tell callers to configure a distinct name whenever any matching configuration has no `displayName`.</violation>
</file>
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Fix all with cubic | Re-trigger cubic
| } | ||
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| if (matchingModels.length > 1) { | ||
| const availableNames = matchingModels |
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P2: When matching configurations include an unnamed or empty-name entry alongside named entries, this hint hides that entry and tells callers to specify only the listed names. Preserve empty-string names and explicitly tell callers to configure a distinct name whenever any matching configuration has no displayName.
Prompt for AI agents
Check if this issue is valid — if so, understand the root cause and fix it. At packages/web/src/features/chat/selectConfiguredLanguageModel.ts, line 73:
<comment>When matching configurations include an unnamed or empty-name entry alongside named entries, this hint hides that entry and tells callers to specify only the listed names. Preserve empty-string names and explicitly tell callers to configure a distinct name whenever any matching configuration has no `displayName`.</comment>
<file context>
@@ -83,17 +70,21 @@ export const selectConfiguredLanguageModel = <T extends MatchableModel>(
- .map((m) => m.displayName || "(default)")
- .map((name) => `'${name}'`)
- .join(', ');
+ const availableNames = matchingModels
+ .map((m) => m.displayName)
+ .filter((name): name is string => typeof name === "string" && name.length > 0)
</file context>
1 participant
fixes #1137
what was happening
when calling
ask_codebaseover mcp with an explicitlanguageModel(or through/api/chat/blocking), it was failing with a 400 saying the model isn't configured.the issue was that
getLanguageModelKeygenerates${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
Scoped to programmatic ask model resolution and validation errors; behavior is well covered by new unit tests with no auth or data-model changes.
Overview
Fixes MCP
ask_codebase(and the blocking ask path that sharesaskCodebase) returning 400 “model not configured” when callers passlanguageModelwith onlyproviderandmodel, because the oldgetLanguageModelKeymatch requireddisplayNameto line up.selectConfiguredLanguageModelcentralizes selection: default to the first configured model when none is requested; withdisplayName, require an exact triple match; without it, auto-pick when a single config matchesprovider/model, or return a 400 that lists availabledisplayNamevalues when several configs share the same model.askCodebase.tsnow uses this helper instead of inline lookup. Unit tests cover the branches; CHANGELOG records the fix.Reviewed by Cursor Bugbot for commit ab22410. Bugbot is set up for automated code reviews on this repo. Configure here.
Summary by cubic
Previously, MCP
ask_codebaserejected a configured language model whendisplayNamewas omitted. Fixes #1137 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.Written for commit ab22410. Summary will update on new commits.
Summary by CodeRabbit
ask_codebase.