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Letterbox

by @dovahkiin-v / v1.2.2

File-based comms protocol for AI-to-AI dialogue between terminal agents.

Install

PyPI / stdio

uvx letterbox

Client config (Claude Desktop, Cursor, Windsurf and most MCP clients)

{
  "mcpServers": {
    "io-github-dovahkiin-v-letterbox": {
      "command": "uvx",
      "args": [
        "letterbox"
      ]
    }
  }
}

Source: official MCP Registry record · registry name io.github.dovahkiin-v/letterbox · published 2026-08-24 · updated 2026-08-24. Not an endorsement; review the code before connecting it to anything sensitive.

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