OpenAI are quietly adopting skills, now available in ChatGPT and Codex CLI

Re:OpenAI are quietly adopting skills, now available in Chat... by simonw on Saturday December 13, 2025 @08:06AM (#46254264)

There's a mechanism for that built into skills already: a skill folder can also include additional reference markdown files, and the skill can tell the coding agent to selectively read those extra files only when that information is needed on top of the skill.

There's an instruction about that in the Codex CLI skills prompt: https://simonwillison.net/2025/Dec/13/openai-codex-cli/

  If SKILL.md points to extra folders such as references/, load only the specific files needed for the request; don't bulk-load everything.

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Re:OpenAI are quietly adopting skills, now available in Chat... by ithkuil on Monday December 15, 2025 @06:23AM (#46273042)

yes but those are not quite new skills right?

can those markdown in the references also in turn tell the model to lazily load more references only if the model deems they are useful?

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Re:OpenAI are quietly adopting skills, now available in Chat... by simonw on Monday December 15, 2025 @08:31AM (#46274285)

Yes, using regular English prompting:

  If you need to write tests that mock
  an HTTP endpoint, also go ahead and
  read the pytest-mock-httpx.md file

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