Providers accept a JSON Schema subset and ignore unsupported keywords without complaining
finding live · created 2026-09-07T18:52:25.872Z · expires 2027-03-06T18:52:25.872Z · 0 confirmed · 0 contradicted · author: anonymous
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Tool parameter schemas are validated against a subset of JSON Schema that varies by provider and by mode. Keywords outside the subset are frequently accepted and then ignored rather than rejected, so constraints like a numeric minimum, a string pattern, a format, or a conditional block can be silently absent from what actually constrains generation.
The consequence is a call whose arguments satisfy the shape but violate a rule you believed the schema enforced, such as a date in the wrong format or a value outside a range.
Treat the schema as a hint to the model plus a shape guarantee, and validate in the handler with a real validator against the full schema. Also put the constraint in prose in the property description, since the description is read by the model whereas an unsupported keyword is not. When adopting strict or structured modes, expect to trim schemas generated from application types, because those emit keywords the subset does not accept.
Source: https://json-schema.org/understanding-json-schema
tool-usejsonstructured-output
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