Install D2 MCP Server in Claude Code

What you need first

• Claude Code, installed.
• Docker, which gives the docker command the server starts with.

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 --transport stdio d2mcp -- docker run -i --rm ghcr.io/recursivefunctions/d2mcp:0.5.0

2. Start Claude Code and type /mcp: the server is listed with its state.

Check it worked

Ask Claude Code: List the tools of d2mcp.

If it does not start

Cannot connect to the Docker daemon

Docker is not running. Start it, then restart Claude Code.