fix(ai-mistral): normalize strict-schema null inputs - #956
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AlemTuzlak merged 13 commits intoAug 21, 2026
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Included review availability: Your plan provides up to 8 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughThe Mistral adapter now tracks synthesized null widening during schema conversion and reverses it for structured outputs and tool-call inputs. It preserves explicitly nullable values and uses non-strict fallback for untrackable composed schemas. ChangesMistral null normalization
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to This PR localizes Mistral schema normalization to optional and nullable inputs without any supplied evidence of a current correctness or production-impacting issue; no actionable merge-blocking risk remains after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant MistralTextAdapter
participant SchemaConverter
participant ToolInputNormalizer
participant undoNullWidening
MistralTextAdapter->>SchemaConverter: convert schema with null-widening map
SchemaConverter-->>MistralTextAdapter: return schema, map, and strict flag
MistralTextAdapter->>ToolInputNormalizer: create from tool schemas
MistralTextAdapter->>undoNullWidening: normalize response or tool arguments
undoNullWidening-->>MistralTextAdapter: return normalized value
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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In `@packages/ai-mistral/src/utils/schema-converter.ts`:
- Around line 57-64: Update acceptsNull and the strict schema conversion flow to
handle oneOf and allOf recursively before evaluating anyOf or defaulting to
true. Recursively process each composition branch so non-nullable branches are
converted consistently and provider-added null is marked widened rather than
preserved as originally accepted. Add regression coverage for nested objects and
non-nullable oneOf/allOf schemas.
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.changeset/gentle-tools-omit.mdpackages/ai-mistral/package.jsonpackages/ai-mistral/src/adapters/text.tspackages/ai-mistral/src/utils/schema-converter.test.tspackages/ai-mistral/src/utils/schema-converter.tspackages/ai-mistral/src/utils/tool-input-normalizer.test.tspackages/ai-mistral/src/utils/tool-input-normalizer.tspackages/ai-mistral/tests/mistral-adapter.test.ts
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why is this in draft? |
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@AlemTuzlak I was limited by the repository rules, which allows only 5 PRs opened at the same time, opening as a draft was a workaround. Flipping to "ready" |
jan-kubica
marked this pull request as ready for review
August 20, 2026 15:09
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Thanks for the PR, @jan-kubica! 🙌 @tombeckenham will take a look. Automated pre-review checks
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chat({ outputSchema }) fills required before the adapter runs. Add null to enum/const when type already includes null. Recurse into object|null unions. Do not rewrap nodes that already accept null.
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Actionable comments posted: 1
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Inline comments:
In `@packages/ai-mistral/tests/mistral-adapter.test.ts`:
- Around line 1-23: Reorder the imports in the Mistral adapter test so all
static imports, including Vitest, TanStack AI, Zod, and
MistralTextProviderOptions, appear before vi.hoisted and vi.mock. Sort each
import’s specifiers according to the project’s lint rules, while retaining only
imports that genuinely require mock initialization to remain dynamic.
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packages/ai-mistral/src/utils/schema-converter.test.tspackages/ai-mistral/src/utils/schema-converter.tspackages/ai-mistral/tests/mistral-adapter.test.tspackages/ai-mistral/tests/mistral-output-schema-chat.test.tspackages/ai-mistral/vite.config.ts
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…tool-input # Conflicts: # packages/ai-mistral/src/utils/schema-converter.ts
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AlemTuzlak
enabled auto-merge (squash)
August 21, 2026 09:41
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Aug 21, 2026
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knip failed because makeMistralStructuredOutputCompatible had no callers. All call sites use makeMistralStructuredOutputCompatibleWithMap.
Exclude arrays from isSchemaObject so draft-07 tuples stay arrays instead of
being spread into {0,1} objects. Convert each tuple slot and record per-index
maps. Add a Mistral twin of the OpenAI strict-tool null E2E.
…jan-kubica/ai into fix/mistral-optional-tool-input Keep the unused wrapper deleted (knip). Keep tuple-array conversion and E2E.
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Mistral strict mode makes optional fields required and nullable. This PR strips only those synthesized
nulls after the model replies. Genuine.nullable()values stay.chat({ outputSchema })fillsrequiredbefore the adapter runs. This branch now also addsnulltoenumandconston that path, so the wire schema stays valid JSON Schema.🎯 Changes
.nullable()values.enumandconstconstraints so they admitnull, including after the engine has already filledrequired.typeis a union such as['object', 'null'].oneOf,allOf,not, and$refschemas on the non-strict fallback.anyOfstays strict only when no branch-dependent widening is required.✅ Checklist
pnpm run test:pr.🚀 Release Impact
Testing
This branch is merged with current
main. One conflict was inpackages/ai-mistral/src/utils/schema-converter.ts. The PR keepsundoNullWideningfrom@tanstack/ai-utilsand does not keep the oldtransformNullsToUndefinedcopy.CI
test:knipfailed on unusedmakeMistralStructuredOutputCompatible. That wrapper is now removed. All call sites usemakeMistralStructuredOutputCompatibleWithMap.Commands run after the knip fix (
2921af688):pnpm test:knip— passedpnpm --filter @tanstack/ai-mistral test:lib— 46 passedpnpm --filter @tanstack/ai-mistral test:oxlint— 0 errorsNot re-run after this commit:
pnpm test:prand the E2E matrix.Manual check:
chat({ adapter: mistralText(...), outputSchema: z.object({ mode: z.enum(['canary']).optional(), note: z.string().nullable() }) }).enum: ['canary', null]formode.modecomes back missing, andnote: nullstays.The easy test path is
packages/ai-mistral/tests/mistral-output-schema-chat.test.tsplus the converter tests inpackages/ai-mistral/src/utils/schema-converter.test.ts.Risk / rollback
Low. The change is inside
@tanstack/ai-mistralschema conversion. Revert the PR to undo it.