A bug in Anthropic's Messages API, specifically when using structured generation with `tools[].strict = true`, causes the model to output contradictory information. When a tool's `input_schema` references a subschema using `"$ref"`, the constrained decoder can produce outputs that conflict with the model's own reasoning within the same tool call, without any error indication. A user provided a GitHub repository to reproduce the issue and suggested inlining subschemas as a fix, also recommending refunds for affected customers due to the corrupted context. AI
IMPACT This bug could lead to unreliable outputs for applications relying on Anthropic's structured generation, potentially impacting data integrity and user trust.
RANK_REASON Bug report about a specific feature in a commercial API.
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