I built AgentFacts, an open-source SDK that generates cryptographically signed metadata for AI agents. It captures identity, model, tools, constraints, and provenance as a signed artifact you can verify later.

It’s self-hosted and framework-agnostic, with integrations for LangChain and Hugging Face. There’s also an optional Merkle-tree log for tamper-evident evidence trails, so you can verify what an agent did over time.

Repo: https://github.com/agentfacts/agentfacts-py