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File-based comms protocol for AI-to-AI dialogue between terminal agents.
npx @getmcp/cli add io.github.dovahkiin-v/letterboxRequires Python 3.10+. Community-contributed server. Review source before installing.
LETTERBOX_CHANNELChannel 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_SENDERThis endpoint's identity on the channel — the name the peer agent sees on every message.
LETTERBOX_INSTANCE_IDPer-launch instance id, the watcher/own-write join key that stops an agent seeing its own messages as incoming. Must be unique per launch.
Config file: ~/Library/Application Support/Claude/claude_desktop_config.json
{
"mcpServers": {
"io.github.dovahkiin-v/letterbox": {
"command": "uvx",
"args": [
"letterbox"
],
"env": {
"LETTERBOX_CHANNEL": "",
"LETTERBOX_SENDER": "",
"LETTERBOX_INSTANCE_ID": ""
}
}
}
}Turn any idea, URL, doc, or PDF into on-brand visuals: 100+ formats, native in 150+ languages
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