Zilong Liang / Hack Notes on Dec 20, 2025
OpenAI Codex now officially supports skills. After a few days of people finding OpenAI was quietly adopting skills1, the announcement came today. The thread on X goes through how skills work in Codex and shows examples on how to install third-party pre-built skills like Linear and Notion.
Two baked-in skills skill-creator and skill-installer are available in Codex, making bootstrapping and installing skills easier. See details in their official documentation.
Codex’s choice of skills location is .codex/skills, joining the war with .claude/skills, .github/skills, and .agents/skills. I really want to see a unification here.
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Simon Willison’s blog: OpenAI are quietly adopting skills, now available in ChatGPT and Codex CLI ↵
AI Transparency Statement1. More and more content on the internet is generated by AI these days, and there’s a new word slop to describe the wave of unwanted, unreviewed, and low-value AI-generated content. It’s so alarming that people are starting to be paranoid about the quality of the content they see online, even obviously handcrafted and curated ones.
One of the indicators is the em dashes (—). Since AI-generated content often includes em dashes, they become a signal, and a warning: you might be reading AI-generated content.
It’s usually not true. But the paranoia runs so deep that some writers like Armin Ronacher now publish statements to defend their work.
As for me, I guarantee that all content here is written by me, though I do use AI tools to help review and refine my writing (like this one), and it’s me who does the thinking and makes the final decision. That’s an appropriate way to use AI as an editing tool, in my opinion. Maybe I should write a similar statement for this website too — and maybe every content creator should do the same.