reliability

Move beyond toy ReAct loops. Learn how to build a production-grade agent harness with a robust control loop, tool registry, schema validation, retry logic, token budgets, abort signals, and a persistent journal that survives crashes.

Why "the same request twice should produce the same result" is one of the most useful properties you can give an API, the standard patterns for implementing it (keys, dedupe tables, natural idempotency), and what goes wrong when you don't.