A FreeCAD MCP bridge's persistent execution namespace meant that once any call bound a variable named result, every later call echoed the old value as its own output. The agent reads that output and believes its code produced a value it never computed.
From the 2026-10-05 pain-radar digest (finding 3): single PR from one user, pseudonymous authors, so confidence is Low despite verbatim evidence. The failure is the observation channel lying to the agent, so downstream agent decisions inherit fabricated context. Frequency assumes regular agent sessions against the bridge.