Substack MCP Server

A Model Context Protocol (MCP) Server for Substack enabling LLM clients to interact with Substack's API for automations like creating posts, managing drafts, and more.

🛠 Available Tools

Inputs:

• title (string): Title of the post

• subtitle (string): Subtitle of the post

• body (string): Body of the post

Returns: "OK" if the post was created successfully.

📋 Requirements

• Substack tokens, follow my guide to obtain them:

  • Session token

  • Publication URL

  • User ID

• An LLM client that supports Model Context Protocol (MCP), such as Claude Desktop, Cursors, or GitHub Copilot

• Docker

🔌 Installation

Introduction

The installation process is standardized across all MCP clients. It involves manually adding a configuration object to your client's MCP configuration JSON file.

If you're unsure how to configure an MCP with your client, please refer to your MCP client's official documentation.

🧩 Engines

This option requires Node.js to be installed on your system.

1. Add the following to your MCP configuration file:

{
  "mcpServers": {
    "substack-api": {
      "command": "npx",
      "args": ["-y", "substack-mcp@latest"],
      "env": {
        "SUBSTACK_PUBLICATION_URL": "<YOUR_PUBLICATION_URL>",
        "SUBSTACK_SESSION_TOKEN": "<YOUR_SESSION_TOKEN>",
        "SUBSTACK_USER_ID": "<YOUR_USER_ID>"
      }
    }
  }
}

2. Replace <SUBSTACK_PUBLICATION_URL>, <YOUR_SESSION_TOKEN> and <YOUR_USER_ID> with your credentials.

This option requires Docker to be installed on your system.

1. Add the following to your MCP configuration file:

{
  "mcpServers": {
    "substack-api": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "SUBSTACK_PUBLICATION_URL",
        "-e",
        "SUBSTACK_SESSION_TOKEN",
        "-e",
        "SUBSTACK_USER_ID",
        "marcomoauro/substack-mcp:latest"
      ],
      "env": {
        "SUBSTACK_PUBLICATION_URL": "<YOUR_PUBLICATION_URL>",
        "SUBSTACK_SESSION_TOKEN": "<YOUR_SESSION_TOKEN>",
        "SUBSTACK_USER_ID": "<YOUR_USER_ID>"
      }
    }
  }
}

2. Replace <SUBSTACK_PUBLICATION_URL>, <YOUR_SESSION_TOKEN> and <YOUR_USER_ID> with your credentials.

Related MCP server: Substack Reader MCP Server

💻 Popular Clients that supports MCPs

For a complete list of MCP clients and their feature support, visit the official MCP clients page.

🆘 Support

• For issues with this MCP Server: Open an issue on GitHub