• agent skill — A reusable instruction file that teaches an agent how to do one job well — the procedure, the tools, and what counts as done.
• AI agent — An AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.

OpenAI ships the Codex desktop agent with its own Python, Node, git, Poppler and LibreOffice binaries, so document conversion and office file handling run as local skills invoking bundled tools rather than a hosted tool API.

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