fix(openai): strip pattern keyword from Responses API schemas (zod v4 compat)#16521
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FrancoKaddour wants to merge 3 commits into
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fix(openai): strip pattern keyword from Responses API schemas (zod v4 compat)#16521FrancoKaddour wants to merge 3 commits into
FrancoKaddour wants to merge 3 commits into
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…d server_error with zod v4
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Recurse only through known JSON Schema structural keywords (properties, patternProperties, \, allOf, anyOf, etc.) instead of every object key. Prevents deletion of user-defined tool or response parameters whose name happens to be 'pattern'.
…types The function returned unknown, causing a tsc error when assigned to the strongly-typed parameters: JSONSchema7 field of OpenAIResponsesFunctionTool. Using a generic <T> preserves the input type through the return value.
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Fixes #16021
zod v4's toJSONSchema() emits pattern for string validators like z.email(), z.uuid(), and z.iso.date(). These patterns contain regex features (e.g. lookaheads) that OpenAI's structured outputs API does not support, causing a server_error response.
This strips the pattern keyword recursively from schemas sent to the Responses API — both in response format text.format.schema) and in tool parameters — before the request is made.