Building developer tools and SaaS at Heaviside Solutions. Creator of HandoffProbe.

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Christopher Heaviside • Peerlist

HandoffProbe is a local-first open-source security testing CLI for AI agent handoffs across protocol, tool and execution boundaries. It focuses on failures that can emerge when individually valid components are composed: permission widening, identity or tenant continuity problems, replay, malformed payloads, manipulated tool output and data being reinterpreted as instructions.HandoffProbe tests the handoff itself — the trust boundary between components — with deterministic, reproducible attack cases.v0.2.0 is now publicly available with exactly 22 stable security tests for the A2A 1.0 → MCP 2026-07-28 baseline. It can run locally, through npm, or as a reusable GitHub Action in CI.