MCP server

Letterbox

io.github.dovahkiin-v/letterbox

Checked 26 Oct 2026, 08:31 UTC · Still published on its registry; checked against OSV.dev; never run by us

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

Runs on your computer

Source

At a glance

Type: MCP server
Publisher: Not verified
Status: Runs on your computer
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code
Last checked: 26 Oct 2026, 08:31 UTC

Connect it to your agent

Add to Cursor Add to VS Code VS Code Insiders

Opens the app, which shows the server and asks you to confirm. It then runs the package on your computer with your permissions. For other apps, copy the setup below.

Claude Code

claude mcp add letterbox --env LETTERBOX_CHANNEL=YOUR_VALUE --env LETTERBOX_SENDER=YOUR_VALUE --env LETTERBOX_INSTANCE_ID=YOUR_VALUE -- uvx letterbox@1.2.2

Claude Desktop

{"mcpServers":{"letterbox":{"command":"uvx","args":["letterbox@1.2.2"],"env":{"LETTERBOX_CHANNEL":"YOUR_VALUE","LETTERBOX_SENDER":"YOUR_VALUE","LETTERBOX_INSTANCE_ID":"YOUR_VALUE"}}}}

Codex (config.toml)

[mcp_servers.letterbox]
command = "uvx"
args = ["letterbox@1.2.2"]
env = { LETTERBOX_CHANNEL = "YOUR_VALUE", LETTERBOX_SENDER = "YOUR_VALUE", LETTERBOX_INSTANCE_ID = "YOUR_VALUE" }

Gemini CLI

{"mcpServers":{"letterbox":{"command":"uvx","args":["letterbox@1.2.2"],"env":{"LETTERBOX_CHANNEL":"YOUR_VALUE","LETTERBOX_SENDER":"YOUR_VALUE","LETTERBOX_INSTANCE_ID":"YOUR_VALUE"}}}}

Cursor

{"mcpServers":{"letterbox":{"command":"uvx","args":["letterbox@1.2.2"],"env":{"LETTERBOX_CHANNEL":"YOUR_VALUE","LETTERBOX_SENDER":"YOUR_VALUE","LETTERBOX_INSTANCE_ID":"YOUR_VALUE"}}}}

VS Code

{"servers":{"letterbox":{"type":"stdio","command":"uvx","args":["letterbox@1.2.2"],"env":{"LETTERBOX_CHANNEL":"YOUR_VALUE","LETTERBOX_SENDER":"YOUR_VALUE","LETTERBOX_INSTANCE_ID":"YOUR_VALUE"}}}}

Runs on your computer with your permissions: check the package and its source before installing. Replace YOUR_VALUE with your own LETTERBOX_CHANNEL, LETTERBOX_SENDER, LETTERBOX_INSTANCE_ID.

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