ReadingHarness engineering: leveraging Codex in an agent-first worldReadingHarness engineering: leveraging Codex in an agent-first worldHarness engineering: leveraging Codex in an agent-first worldOpenAIOOpenAIreading·OpenAIHarness engineering: leveraging Codex in an agent-first worldRyan LopopoloDomainopenai.comAuthorRyan LopopoloPublishedFebruary 11, 2026Canonical URL/reading/2026-02-16-harness-engineeringOpen source page