Simon Willison’s Weblog

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11th February 2026

Research openai-api-skills — OpenAI's Skills API enables models to execute reusable, self-contained scripts and tools by packaging instructions and code (plus optional assets) with a `SKILL.md` manifest. This project demonstrates crafting a custom skill (“csv-insights”), uploading it via the `/v1/skills` endpoint, and invoking it in natural language through the Responses API’s hosted shell environment, where the model installs dependencies, executes scripts, and returns outputs such as markdown reports and plots.

This is a beat by Simon Willison, posted on 11th February 2026.

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