A useful internal agent can be built and deployed in a single Codex session starting from a prompt only a couple of sentences long.

The initial ask was a short prompt to build a GitHub bot that grades PRs and auto-approves low-risk ones; everything after was steering and refinement. ✦ AI generated

Claire · Lenny's Newsletter · 2026-08-10 · original ↗

A useful internal agent can now be built and deployed in a single Codex session, starting with a prompt that's only a couple of sentences long. In this case, the initial ask was essentially: build a GitHub bot that waits for checks to pass; grades each PR as low, medium, or high risk; and automatically approves the low-risk ones. Everything after that was steering and refinement, not a giant up-front specification.

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