Unvalidated JSON, not bad reasoning, is why AI agents crash in production

samuelcolvin · x · 2026-09-05

The biggest cause of AI agent crashes in production isn't poor reasoning — it's unvalidated JSON: a missing field or malformed schema breaks the agent loop.
Frameworks like Pydantic AI are surging because they enforce strict types at every tool boundary, automatically retry with validator error feedback, and eliminate runtime crashes from hallucinated keys.
Takeaway: prompt engineering makes demos look clever; strict schema validation makes systems reliable. If you can't type-check your agent's output, it isn't production software.

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