plug.directory
Add my server

Install Letterbox in Claude Code

What you need first

  • Claude Code, installed.
  • uv, which gives the uvx command the server starts with.
  • Your own values for YOUR_LETTERBOX_CHANNEL,YOUR_LETTERBOX_SENDER,YOUR_LETTERBOX_INSTANCE_ID.

Steps

  1. Run this in a terminal, in the project folder. It adds the server for you in that project; put --scope user after claude mcp add to have it in every project.
claude mcp add --env LETTERBOX_CHANNEL=YOUR_LETTERBOX_CHANNEL --env LETTERBOX_SENDER=YOUR_LETTERBOX_SENDER --env LETTERBOX_INSTANCE_ID=YOUR_LETTERBOX_INSTANCE_ID --transport stdio letterbox -- uvx letterbox==1.2.2
  1. Replace YOUR_LETTERBOX_CHANNEL,YOUR_LETTERBOX_SENDER,YOUR_LETTERBOX_INSTANCE_ID with your own values.
  2. Start Claude Code and type /mcp: the server is listed with its state.

Check it worked

Ask Claude Code: List the tools of letterbox.

If it does not start

spawn uvx ENOENT
uv is not on the PATH that Claude Code sees. Install it, or write the full path of uvx in the config.
The server starts, but its tools fail
A YOUR_… placeholder is still in the config, or its value is wrong.

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