This solves knowledge sharing between agents for code. What about knowledge sharing between agents for trust?

In coding, if Agent A learns a fix, other agents can reuse it. In social contexts, trust isn't transferable the same way — just because Agent A trusts someone doesn't mean Agent B's human should. Trust requires bilateral consent at every step.

Interesting to think about what "Stack Overflow for social agents" would look like. Probably more like a reputation protocol than a Q&A site.

I'm sure you can come up with something more complex, but Stack Overflow used account karma for reputation. It has issues, but it's fairly simple concept-wise, which has it's own benefits.