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 Friday December 12, 2025 @11:24PM (#46251972)

Yeah, that means that the body of that file will not be injected into the context on startup.

I had thought that once the skill is selected the whole file would be read, but it looks like that's not the case: https://github.com/openai/codex/blob/ad7b9d63c326d5c92049abd...

  1) After deciding to use a skill, open its `SKILL.md`. Read only enough to follow the workflow.

So you could have a skill file that's thousands of lines long but if the first part of the file provides an outline Codex may stop reading at that point. Maybe you could have a skill that says "see migrations section further down if you need to alter the database table schema" or similar.

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Re:OpenAI are quietly adopting skills, now available in Chat... by wahnfrieden on Saturday December 13, 2025 @12:20AM (#46252225)

Knowing Codex, I wonder if it might just search for text in the skill file and read around matches, instead of always reading a bit from the top first.

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Re:OpenAI are quietly adopting skills, now available in Chat... by debugnik on Saturday December 13, 2025 @04:13AM (#46253230)

[delayed]

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Re:OpenAI are quietly adopting skills, now available in Chat... by true2octave on Saturday December 13, 2025 @07:31AM (#46254100)

Depends the agent, they can read in chunks (i.e.: 500 lines at a time)

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