git int-trailers compatibility is a nonsense phrase. You don’t care about compatibility with a helper tool. You care about the tools that use them... and git log uses them.

> The format is optimised for agent querying and human readability

Yours is key value pairs. Trailers are key value pairs. The git log can be read by humans and agents... what’s even the differentiator here?

Agents read English. But every little minutia of programming now needs something “for agents and humans”? Which is like colon-separated key value pairs... except they also have a scope in parens. Which makes all the difference to agents? tuts