> **About this code.** These are **teaching samples**, not production-grade libraries. They are written for clarity over coverage: each sample demonstrates a single technique, with error handling, retry, observability, and configuration shown to a useful depth rather than exhaustively. Patterns covered -- prompt caching, resilience, evaluation, model routing, output guards, MCP transports -- are real and copy-pasteable, but hardening, threat-modeling, and cost-bounding them for your environment is your responsibility.
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