plug.directory
Add my server

Install Substack MCP Server in Claude Code

What you need first

  • Claude Code, installed.
  • Node.js, which gives the npx command the server starts with.
  • Your own values for YOUR_SUBSTACK_PUBLICATION_URL,YOUR_SUBSTACK_SESSION_TOKEN,YOUR_SUBSTACK_USER_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 SUBSTACK_PUBLICATION_URL=YOUR_SUBSTACK_PUBLICATION_URL --env SUBSTACK_SESSION_TOKEN=YOUR_SUBSTACK_SESSION_TOKEN --env SUBSTACK_USER_ID=YOUR_SUBSTACK_USER_ID --transport stdio substack-mcp -- npx -y [email protected]
  1. Replace YOUR_SUBSTACK_PUBLICATION_URL,YOUR_SUBSTACK_SESSION_TOKEN,YOUR_SUBSTACK_USER_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 substack-mcp.

If it does not start

spawn npx ENOENT
Node.js is not on the PATH that Claude Code sees. Install it, or write the full path of npx 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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