Query Monitor

FinHarness: Inline Lifecycle Safety Harness for Finance LLM Agents

FinHarness is a safety harness for finance LLM agents that wraps agent execution end-to-end with three components: a Query Monitor for intent and drift detection, a Tool Monitor for per-call risk evaluation, and a Cascade module that adaptively routes verification between lightweight and advanced LLM judges. Unlike post-hoc auditing, it injects risk signals back into the agent input as ex-ante evidence, enabling real-time refusal or replanning. On the FinVault benchmark, it reduces attack success rate from 38.3% to 15.0% while preserving benign approval rates and using 4.7× fewer expensive judge calls than an always-advanced baseline.