OpenAI has introduced Skills in Codex, a feature enabling developers to customize the Codex coding agent with task-specific capabilities using pre-built packages or custom scripts created through natural-language prompts or manually written code.
The service allows developers to bundle instructions, resources, and optional scripts to enable Codex to execute specific workflows reliably. According to OpenAI’s developer documentation, these skills can be utilized to enhance the coding agent’s functionality. Pre-built skills are available through GitHub, and developers can install them globally in the ~/.codex/skills/ directory or scope them to individual repositories.
The feature employs progressive disclosure to manage context, loading essential information at startup and accessing full details on demand. This approach ensures efficient and effective use of the skills within the Codex environment. The launch of Skills in Codex follows OpenAI’s recent release of GPT-5.2-Codex, described as its “most advanced agentic coding model yet.”
OpenAI’s Skills in Codex is built on the Agent Skills standard, originally released by Anthropic on December 18. The specification is hosted at agentskills.io and has been adopted by several major companies, including Microsoft, GitHub, Cursor, Goose, Amp, and OpenCode. Mahesh Murag, a product manager at Anthropic, noted that the company is launching Agent Skills as an independent open standard with a specification and reference SDK available at https://agentskills.io.
Anthropic initially introduced Agent Skills in October 2023 as a developer feature for its Claude AI assistant. The company has partnered with various firms, including Atlassian, Figma, Canva, Stripe, Notion, and Zapier, to offer pre-built skills. The launch of Skills in Codex occurs amid increasing competition among AI developers to enhance coding agents.
Recently, Amazon Web Services revealed “powers” for its Kiro coding agent at the re:Invent conference. These powers provide expertise modules through Model Context Protocol servers and steering files, similar to the skills offered by OpenAI’s Codex. AWS described powers as “expertise modules that give the Kiro agent instant knowledge of specific technologies and frameworks.”
