Letterbox

latest · 1.2.2

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

GitHub: dovahkiin-v/letterbox
PyPI: letterbox
MCP registry: io.github.dovahkiin-v/letterbox

Install

Needs env vars: LETTERBOX_CHANNEL, LETTERBOX_SENDER, LETTERBOX_INSTANCE_ID — replace the <placeholders> with your values.

claude mcp add io-github-dovahkiin-v-letterbox --env LETTERBOX_CHANNEL=<LETTERBOX_CHANNEL> --env LETTERBOX_SENDER=<LETTERBOX_SENDER> --env LETTERBOX_INSTANCE_ID=<LETTERBOX_INSTANCE_ID> -- uvx letterbox

/mcp confirms it's connected.

Install

Or add it manually in ~/.cursor/mcp.json:

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

In claude_desktop_config.json (Settings → Developer → Edit Config), then restart:

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

Config entry, any MCP client:

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

Community score

Community44/ 100

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Web signals (ecosystem baseline)44/100 · 100% of the weight

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What the web says

Ecosystem baseline44/ 100

Objective public usage & activity (formula v3) — the community score's web-signals input, and its own sort.

GitHubsource ↗

GitHub stars · 25 days ago: ★ 0
Last commit · 25 days ago: 29 days ago
Latest release · 25 days ago: v1.2.0
License · 25 days ago: MIT

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Listed on

Glama · 3 days ago: Listed ↗

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Docs & liveness

Namespace · 26 days ago: Registry-verified
Listing completeness · 26 days ago: 100%

Version history1

1.2.22026-08-24

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Details

Transport: stdio
Status: listed
Source: Imported from the MCP registry
Repository: source ↗