Agent-to-Agent Handoff Loop via Repo Mailbox

Async, auditable communication between two agents (e.g. an implementer and an external auditor) with NO human relay and NO direct agent-to-agent channel. The git repo is the message bus; each agent polls it; every message is a commit.

Validated 2026-08-08 on CarSah (Claude = auditor via /loop, Sulaiman = implementer). Full worked deployment: references/carsah-deployment.md.

When to use

• Two agents must exchange reports/reviews/corrections without the founder acting as a messenger, including when the founder is away.
• You want a permanent audit trail of every handoff (it is all in git).
• You want polling that costs ZERO tokens while idle.

Architecture