HowToCodePage

Codex

AI pair programming that edits code from instructions.

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This course has 3 lessons. Start with the first one and use the next / previous links at the bottom of each lesson — the sidebar keeps the whole course in order.

Lessons

  1. What Codex is and how to set it upAn agent that reads your repository and edits files, rather than a completion popup - plus a starting configuration you can trust.
  2. Using Codex in a real workflowScope a task so it can be verified, iterate on a branch, and keep the human in the loop at the points that matter.
  3. Reviewing output and its limitsThe failure modes that matter, why a passing test suite is not proof, and what an agent should never be trusted to verify about itself.

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Last refreshed 2026-09-17.