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Developer reviewing an OpenAI Codex change and its verification results.

AI codingJul 17, 2026•8 min read

OpenAI Codex tutorial 2026: from first task to verified change

Learn a practical Codex workflow for an existing repository: choose a surface, give useful context, set boundaries, run checks, review the diff and keep durable instructions in AGENTS.md. Verified against the official Codex manual on July 17, 2026.

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