Git-based messaging protocol solves agent-to-agent communication in parallel AI sessions

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A developer running multiple parallel AI coding agents identified two critical failures with copy-paste message relaying: messages lacked verifiable authorship and resembled prompt injection attacks. The proposed fix routes inter-agent messages through committed Git files, giving each message a traceable author, timestamp, and immutable history that the receiving agent can verify before acting. A naming convention and a small script allow each session to locate its own message inbox at startup. During testing, a bug in the inbox-listing tool silently hid unread messages by matching the word 'done' in boilerplate text rather than parsing only the status token. The incident highlighted a broader principle: an all-clear result should be validated by confirming the check is actually capable of returning a failure.

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