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Getting the Source Right, Not Just the Fact: Source-Aware Verification for MCP Agents
A new verification method catches LLM agents that attribute facts to the wrong source.
Hugging Face and Multiverse Computing released a paper introducing ProvenanceGuard, a post-generation verification layer for MCP-based LLM agents that checks whether each claim is supported by the specific source the answer attributes it to, rather than by any source in a pooled evidence set.
In tests on 361 claims from a medical agent, it caught 138 of 139 claims that human experts said should not pass, while flagging 67 supported claims for review under a conservative setting.
From the source
The failure mode we care about is one we call cross-source conflation: a claim that is true somewhere in the evidence, but attributed to the wrong source. A source-blind verifier may pass it, because the fact does exist in the pool. A source-aware verifier should not.
huggingface.co