Human-in-the-loop authorization for AI agents

Airlock is a human-in-the-loop authorization system built on the HARP specification that intercepts sensitive AI agent commands, encrypts them with AES-256-GCM, and routes them to a mobile approver who signs a decision with Ed25519 that is verified locally before execution. It features a zero-knowledge gateway, replay protection via nonces and expiry timestamps, and enterprise deployment within an organization's own infrastructure. The HARP protocol is described as an open, tool-agnostic standard covering canonicalization, artifact hashing, decision signing, and replay protection.