Hugging Face released ProvenanceGuard, a post‑generation checker for Model Context Protocol (MCP) agents. It keeps the IDs of tool outputs alive, matches each claim to its true source, and blocks answers that attribute facts to the wrong source. In a medical test on 281 agent traces, human reviewers flagged 139 claims as wrong; ProvenanceGuard caught 138 of them and correctly identified the source 86% of the time.
Why it matters
Ensuring the right source backs each claim helps prevent misleading information in sensitive fields like healthcare and finance.
