plug.directory
Add my server

Install Cairn in Claude Code

What you need first

  • Claude Code, installed.
  • Docker, which gives the docker command the server starts with.
  • Your own values for YOUR_CAIRN_DB_HOST,YOUR_CAIRN_DB_PASS.

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 CAIRN_DB_HOST=YOUR_CAIRN_DB_HOST --env CAIRN_DB_PASS=YOUR_CAIRN_DB_PASS --transport stdio cairn-mcp -- docker run -i --rm -e CAIRN_DB_HOST -e CAIRN_DB_PASS ghcr.io/jasondostal/cairn-mcp:0.21.2
  1. Replace YOUR_CAIRN_DB_HOST,YOUR_CAIRN_DB_PASS 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 cairn-mcp.

If it does not start

Cannot connect to the Docker daemon
Docker is not running. Start it, then restart Claude Code.
The server starts, but its tools fail
A YOUR_… placeholder is still in the config, or its value is wrong.

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