Send and receive templated markdown messages between agents via <agent-root>/inbox/ folders - the file-based channel between peer agents working separate repos on the same machine. Use when asked to message, notify, hand off to, or request something from another agent or repo ("tell the vault agent", "send them a design request", "reply to that message"); when asked whether another agent has answered or anything new arrived; when a session-start notice reports unprocessed inbox messages that need reading, acting on, and resolving; for the closing sweep that buckets remaining messages by what they still owe; and to send to any inbox path. Human email, Slack, and calendar i…
