MCP Agent Mail

A mail-like coordination layer for coding agents exposed as an HTTP-only FastMCP server. Provides memorable identities, inbox/outbox, file reservation leases, contact policies, searchable message history, and Human Overseer messaging. Backed by Git (human-auditable artifacts) and SQLite (fast queries with FTS5).

Why This Exists

Without coordination, multiple agents:

• Overwrite each other's edits or panic on unexpected diffs
• Miss critical context from parallel workstreams
• Require humans to relay messages between tools

Agent Mail solves this with:

• Memorable identities (adjective+noun names like "GreenCastle")
• Advisory file reservations to signal editing intent
• Threaded messaging with importance levels and acknowledgments
• Pre-commit guard to enforce reservations at commit time
• Human Overseer for direct human-to-agent communication

Starting the Server