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* ♊ fix: Strip remaining unsupported JSON Schema keywords for Gemini MCP tools Gemini's FunctionDeclaration.parameters schema rejects more JSON Schema keywords than sanitizeGeminiSchema previously stripped. MCP tools shipping examples/readOnly/multipleOf/uniqueItems/prefixItems/etc. still 400 with `Unknown name "<key>"`, the same class as #13623 (exclusiveMinimum). Verified live against gemini-2.5-flash and gemini-3.5-flash: each added keyword is rejected through `parameters`, and @langchain/google-genai only removes additionalProperties/$schema, so they must be stripped here. * ♊ refactor: Make Gemini strip-list fully live-verified; preserve `default` Probed every candidate keyword against both the live Gemini API (gemini-2.5-flash, gemini-3.5-flash) and Vertex AI. Confirmed the inferred siblings (dependencies/dependentSchemas/contentSchema) are rejected, so they stay. Dropped `default`: it is part of Gemini's Schema and is accepted by both the Gemini API and Vertex (no documented reason for its removal in #13623), so it is now preserved instead of stripped. * ♊ fix: Preserve `default` data and synthesize array `items` (Codex P2s) Addresses two Codex findings on the strip-list rework: - `default` is now copied verbatim instead of recursed, so object/array default values (e.g. `{ id: 'abc', readOnly: true }`) keep ordinary data keys that the schema-recursion would otherwise strip. - `prefixItems` is dropped but its first member is synthesized into `items`, since Gemini's API requires `items` on every array (live: itemless array => 400; the synthesized `{type:array, items:{...}}` => 200 on Gemini 2.5/3.5 and Vertex). Third finding (patternProperties -> empty object) not actioned: live probing shows `{type:'object'}` with no properties is accepted by both the Gemini API and Vertex. * ♊ fix: Treat boolean/tuple array `items` as missing (Codex P2) The Draft 2020 tuple form `prefixItems: [...], items: false` slipped through: the `'items' in collapsed` check treated boolean `false` as a real item schema, so no fallback was synthesized and `items: false` was emitted — which Gemini rejects (live: `items: false`/`true` => 400 "Invalid value"). Now `items` is only kept when it is a schema object; boolean and tuple-array (`items: [...]`) forms are dropped, a `prefixItems` member is synthesized when present, and any array still missing `items` falls back to `{}` (verified accepted by the Gemini API and Vertex). Adds an `isObjectSchema` guard + tests. |
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