A Contract for Driving Agent Harnesses

Field notes

The protocol organizes interaction around a task handled by a complete harness rather than a single model turn. Its documented surface includes streaming progress, persistent sessions, cancellation, file retrieval, and structured errors, with machine-readable artifacts published alongside the prose specification. The page describes a 52-check conformance suite and gives a local Docker deployment for HarnessRouter Community Edition, while distinguishing that implementation from a separate hosted cloud offering.