Demo agents usually work once. Production agents fail in boring, expensive ways: they loop on the same tool call, they retry forever against a flaky API, and they paste a 40KB JSON blob back into the next thought.

Solon AI already ships a small set of built-in ReAct interceptors for those failure modes. Pair them with stream() event chunks, and you get both guardrails and live UI feedback without inventing a custom agent runtime.

This article sticks to official Solon v4.0.3 APIs from the Agent docs.

What “production shape” means here

Not a bigger prompt. Not a fake harness wrapper. Three concrete controls: