Done Is a Function You Write: Eval-Driven Development for LLMs You Can Actually Trust

by Ravi Vale

142 pages, Kindle Edition

Published June 22, 2026

About the author

Ravi Vale writes practical, no-hype books about working with AI: when to trust it, how to build it, when to halt it, and who stays on the hook when it fails.

His catalog spans several connected shelves. The Verifier's Library teaches everyday readers and leaders how to judge an AI answer and know when to tell it to stop. The Agent Builder's Workshop and The AI-Native Builder Canon are for engineers and founders building agentic systems that act on their own, with the discipline to keep them observable and reversible. The Operator's AI Library is a set of field manuals for managers and business owners who must supervise AI agents that act, spend, and send, without a security team or a line of code. Stop Reason and The Locked Room bring the same discipline to narrative nonfiction.

One idea runs through all of it: trust is earned, then checked. No hype, no hand-waving. Real tool behavior, verified workflows, and the discipline of never accepting a green light you didn't check.