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Pydantic AI Updates: July 28, 2026

pydantic-ai agents open-source python error-handling

1. Pydantic AI v2.19.0 Adds Header And Retry Metadata To Model Errors

Pydantic AI. Pydantic AI released v2.19.0, adding headers and retry_after fields to ModelHTTPError so applications can read rate-limit and retry hints returned by providers, with the change applied across the supported provider SDKs. The release also fixes cancellation handling by re-asserting external cancellation signals at run step boundaries, and widens the FastMCP dependency range to accept versions below 4.0. Source