OpenAI Codex Skills Guide: Reusable Agent Behaviors for Developer Workflows
OpenAI Codex Skills are reusable, self-contained packages that encode a developer workflow once and let Codex invoke that workflow on demand — without re-prompting. If you’ve ever corrected Codex on the same PR review pattern three times, a skill makes that correction permanent. What Are OpenAI Codex Skills? (The Agent Macro Model) A Codex Skill is a task-specific package of instructions, optional scripts, reference documents, and assets that Codex can invoke autonomously when it determines a skill is relevant. Launched as an experimental feature in December 2025 and reaching wide availability in early 2026, Skills solve a specific problem: AI coding agents are powerful but stateless — every new session forgets your team’s conventions. Skills make those conventions persistent and composable. ...