How do I install Letterbox?

Pick a client above and copy the generated config. Cursor and VS Code also have a deep link when the server can run locally or remotely.

Is Letterbox official?

No. Registry-listed is not the same as vendor-official. Read the methodology for the difference.

How is the trust score calculated?

This listing scores 50 (Fair). The formula is published on the methodology page.

MCPpedia

Letterbox MCP Server — Install for Claude, Cursor & VS Code | MCPpedia

Letterbox MCP Server

Name: Letterbox MCP Server
Author: dovahkiin-v

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

Tools Versions Alternatives

Registrydovahkiin-v

50Fair

Install

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

{
  "mcpServers": {
    "dovahkiin-v-letterbox": {
      "command": "uvx",
      "args": [
        "letterbox"
      ],
      "env": {
        "LETTERBOX_CHANNEL": "",
        "LETTERBOX_SENDER": "",
        "LETTERBOX_INSTANCE_ID": ""
      }
    }
  }
}

Install guide

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Environment

Name	Required	Notes
LETTERBOX_CHANNEL	Yes	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	Yes	This endpoint's identity on the channel — the name the peer agent sees on every message.
LETTERBOX_INSTANCE_ID	Yes	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.

Letterbox MCP Server

Install

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