A draft discussed on Ethereum Magicians proposes a Know-Your-Agent framework for recording trust conclusions about software agents. The thread describes KYA as a registry for assertions about an agent, not as an identity system, a reputation score or an anonymity layer.
The proposal separates several questions that are often collapsed into one label. A relying party may need to know which scheme produced an assertion, which subject it binds to, whether it has expired or been revoked, and which verifier it trusts. The draft also describes a ZK-KYA profile that hides the attestor and underlying facts while leaving the subject identifier public.
The discussion links the framework to ERC-8004 agent identities and describes a bridge that can mirror a result into an ERC-8004 validation registry. Those are design choices in a draft and reference implementation. They are not an adopted Ethereum standard or evidence of broad production use.
When evaluating a KYA system, check the scheme semantics, subject binding, epoch rules, revocation path and verifier trust assumptions separately. A valid proof can show that a rule was followed without proving that the rule itself is sufficient for every application.
Sources: ERC-8419 draft discussion, ERC-8004.