MCP Agent Mail

Agent Mail is the asynchronous coordination layer (FastMCP server) that provides coding agents with identities, inboxes, and advisory file-claim 'leases' to prevent conflicts.

This open-source FastMCP server acts as 'Gmail for your coding agents,' facilitating seamless, token-efficient coordination across multi-agent workflows. It assigns agents, like Claude Code or Gemini CLI, unique identities and a structured inbox/outbox system. The core feature is advisory file-claim 'leases,' which prevents agents from overwriting each other's work (a common issue in parallel development). All communication is stored with dual persistence: Git for human-auditable artifacts and SQLite for fast, searchable message history, ensuring clean, collaborative development and reducing human liaison overhead.

https://mcpagentmail.com/