HandoffProbe: Open-Source Security Testing for AI Agent Handoffs with 22 Test Cases
HeavisideSolutions · reddit · 2026-09-16
HandoffProbe is a new Apache-2.0, local-first open-source tool that turns agent handoff security failures into deterministic adversarial tests. Its 22 stable test cases cover authority widening, identity/context binding failures, replay, cross-translation mutation, and authorization continuity across A2A→MCP handoffs—cases where valid upstream authorization can become broader downstream while appearing schema-valid.
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