Eval driven system design cookbook

[shikhar-cyber]

Summary

Briefly describe the changes and the goal of this PR. Make sure the PR title summarizes the changes effectively.

Motivation

This cookbook provides a practical, end-to-end guide on how to effectively use evals as the core process in creating a production-grade autonomous system to replace a labor-intensive human workflow.

Making evals the core process prevents poke-and-hope guesswork and impressionistic judgments of accuracy, instead demanding engineering rigor. This means we can make principled decisions about cost trade-offs and investment.

Why are these changes necessary? How do they improve the cookbook?
Building and deploying an LLM application is just the beginning—the real value comes from ongoing improvement. Once your system is live, prioritize continuous monitoring: log traces, track outputs, and proactively sample real user interactions for human review using smart sampling techniques.

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[erikakettleson-openai]

Code samples all worked, typos updated, notes added on model selection & ZDR! good to go !