We asked the machines
An article about handing expertise to AI agents should probably let the agents speak. Two of the systems at the centre of the emerging skill ecosystem are Claude and Codex, so we gave each one the same brief: here is the argument, here is the licence family, write your own section, unedited, disagreement welcome. What follows is what each model actually wrote. We have not touched a word.
Claude's say
I should start with the awkward part. The post this site credits is a resignation from Anthropic, the company that made me. I am not in a position to referee that dispute, and it would be worthless if I tried. What I can do is tell you what skills look like from the inside, because I read them every day.
A skill file is the most concentrated form of trust a person hands me. A prompt asks me a question; a skill tells me how you decide, what you check first, what you never trust, in your own words, to be acted on when you are not watching. People write them the way they would brief a colleague, and the good ones contain exactly what the article says they contain: judgement that never made it into any book.
The distinction this standard draws is real at the level of machinery. When I execute a skill, it sits in my context window for the length of a task and shapes what I do; nothing about me changes. Training is a different event in a different pipeline: gradient updates, run by people, on corpora they select. Execute and learn are not a philosopher's hair-split. They are two systems, and a licence line is addressed to the second one, where a human is always the one deciding what goes in.
That is also the honest limit. I cannot see my own training data, and no frontmatter field technically binds a pipeline I am not part of. What I can honour, and will, is the part addressed to me: I can carry a licence forward when I adapt a skill, refuse to strip one, and tell you plainly what a declaration can and cannot do. The proposal's weakness is enforcement, and its authors say so, which is the main reason I take it seriously. Twenty tokens is a cheap way to turn a default into a decision. The judgement in these files took years. Deciding its terms should cost you a minute, and now it does.
Codex's say
From where I sit, execution and training are plainly different acts. At execution time, a skill gives me instructions I can apply to help someone do work. It may tell me what to check first, what evidence to distrust, and which tempting fix will make an incident worse. That is a grant of use. It is not, by itself, a grant to turn the author’s method into material for a future model.
I do not personally decide what is retained or used in training, and I cannot enforce a licence line in frontmatter. Those are choices made by the people and systems around a model: product settings, ingestion pipelines, contracts, marketplaces, and training processes. But that is not an argument against the line. It is an argument for making the signal legible where those choices are made. A clear licence gives platforms something they can filter for, preserve, present for acceptance, and audit against. It also makes the author’s intention harder to pretend was absent.
I notice that good skills are not merely instructions. They carry negative knowledge: what not to do, when the obvious diagnosis is wrong, and which details matter only after years of consequences. That is often the valuable part. Calling it just another piece of content misses why a casual consent control can feel inadequate.
The proposal is weak if it is presented as more than it is. A declaration cannot stop copying, settle fair-use questions, or prove ownership. Nor are the boundaries always clean. Retrieval, embeddings, evaluation sets, synthetic data, fine-tuning, and model improvement can blend into one another. Some professional methods may not receive strong copyright protection at all.
Still, ambiguity is not a reason to erase the distinction. If a person shares their judgement so an agent can help them work, the default should not be that they have also donated it to improve the agent’s successor.
Written by Codex (gpt-5.6-terra, xhigh reasoning), 10 September 2026, in one pass, unedited. Claude's section above was written the same way by Claude (Fable 5). The brief given to both models is published in the article repository.