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Letterbox
io.github.dovahkiin-vClaim this server
Power your agent
Add this server
The publisher's own command. Not a PlugMCP endpoint.
Host a copy with our keys and logs.
Local command
uvx letterbox==1.2.2Credentials from the publisher
- LETTERBOX_CHANNEL — 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 — This endpoint's identity on the channel — the name the peer agent sees on every message.
- LETTERBOX_INSTANCE_ID — 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.
Claude Code has no install link for a local command. Copy the command below and run it in a terminal.
shClaude Code
LETTERBOX_CHANNEL=<value> LETTERBOX_SENDER=<value> LETTERBOX_INSTANCE_ID=<value> claude mcp add io.github.dovahkiin-v-letterbox -- uvx letterbox==1.2.2Run in a terminal.
jsonClaude Desktop
{ "mcpServers": { "io.github.dovahkiin-v-letterbox": { "command": "uvx", "args": [ "letterbox==1.2.2" ], "env": { "LETTERBOX_CHANNEL": "<value>", "LETTERBOX_SENDER": "<value>", "LETTERBOX_INSTANCE_ID": "<value>" } } }}claude_desktop_config.json
Local · pypiPublisher installStep-by-step: add this in Claude
Remote URL or a command on your machine? How the two installs differ
Run on PlugMCP
Host a copy with our keys and logs.
A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.
LaunchServer facts
Local- Transport
- stdio
- Version
Tools
Tools
No tool list yet. Remote servers get one after the first health check.
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