Simon Willison's Codex Tool Reference: 232 Tools and 44 Skills Exposed
ChatGPT Work Tool and Skill Reference
Simon Willison has published a comprehensive inventory of ChatGPT's Codex tools and skills, capturing 232 tool interfaces and 44 complete skill definitions. The reference preserves the exact descriptions and TypeScript declarations, offering a rare glimpse into the capabilities of OpenAI's coding agent. It covers everything from document creation and browser control to data analytics and custom pet creation, with each skill page containing its full SKILL.md source.
Tools are callable endpoints; skills are reusable instruction packages that guide how those tools are used.
- simonw
I think the most interesting skill here is the control-browser one: https://codex-tool-reference.simonw.chatgpt.site/skills/cont...
It tells ChatGPT Work how to launch a Playwright instance via its Node.js REPL, and tells it to run:
nodeRepl.write(await browser.documentation());
To get further instructions.
That method returns this text with full details about how to use the browser: https://codex-tool-reference.simonw.chatgpt.site/skills/cont...
I'd love to know why it's defined like that, as opposed to including all of the instructions directly in the skill Markdown file.
- simonw
See this comment for background (and creation prompt): https://news.ycombinator.com/item?id=49504625#49505116
- satvikpendem
I don't get how this is different from Codex if Codex can do all the same things.
- enraged_camel
Meta comment: I've been wondering why AI-generated websites/artifacts/reports always have the same "look". It reminds me of Bootstrap (CSS Framework) days when every startup website looked the same.
Are they following some sort of common guideline?
- ChrisArchitect
[dupe] Discussion on associated blog post: https://news.ycombinator.com/item?id=49504625