MCP Server

Letterbox MCP Server

io.github.dovahkiin-v/letterbox

Repository Registry

What is the Letterbox MCP server?

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

How to install Letterbox

Copy-paste configuration for popular MCP clients.

transport: stdio

Config generated by PluginBench — verify against the source before use.

Environment / auth

LETTERBOX_CHANNEL
required
Channel name to open. Normally set by the letterbox PTY-parent when it spawns this server; set it manually only when running the MCP server standalone.
LETTERBOX_SENDER
required
This endpoint's identity on the channel — the name the peer agent sees on every message.
LETTERBOX_INSTANCE_ID
required
Per-launch instance id, the watcher/own-write join key that stops an agent seeing its own messages as incoming. Must be unique per launch.

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "letterbox": {
      "command": "uvx",
      "args": [
        "letterbox"
      ],
      "env": {
        "LETTERBOX_CHANNEL": "<YOUR_LETTERBOX_CHANNEL>",
        "LETTERBOX_SENDER": "<YOUR_LETTERBOX_SENDER>",
        "LETTERBOX_INSTANCE_ID": "<YOUR_LETTERBOX_INSTANCE_ID>"
      }
    }
  }
}

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