OpenAI has quietly implemented support for skills in ChatGPT and their Codex CLI tool, following Anthropic's approach from October. Skills are simple folders containing Markdown files and optional resources that LLM tools can read and execute. ChatGPT's Code Interpreter now includes a /home/oai/skills folder with skills for handling spreadsheets, docx, and PDFs. The Codex CLI added experimental skills support two weeks ago, allowing users to place custom skills in ~/.codex/skills. The author successfully tested both implementations, creating a PDF with ChatGPT and building a Datasette plugin with Codex CLI using a custom skill. The rapid adoption by OpenAI suggests skills may become a standard pattern for extending LLM capabilities.
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