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No, it should be short when there's little to say, and long when there's lots to say about things best written in a commit message

I suppose that's fair. The assumption here is things get linked back to the issue tracker and it's not very interesting boring business apps.

Anything technical tends to be a link back to discussion on someone else's issue tracker

Codex is the opposite problem. If you don't aggressively prompt it, and let it write commit messages it will literally just do one incomprehensible line.

Claude will write a novel, sign it with its signature like it's a person, and fill it full of advertisement language and marketing text.

I instruct the agents to do the commit messages they way i want them written. They don't produce a book everytime, they produce what I think it's useful.

Just put your last sentence in your AGENTS.md then

There's too much nuance--it would take a dedicated skill