How do I install Substack?

Substack is a local plugin. Install it using npm package: @conorbronsdon/substack-mcp and add the generated configuration snippet to your AI app's MCP config file. Then restart your AI app.

What credentials does Substack need?

Substack requires the following credentials or environment variables: SUBSTACK_PUBLICATION_URL, SUBSTACK_SESSION_TOKEN, SUBSTACK_USER_ID. You can find setup instructions on the server detail page.

What AI apps work with Substack?

Substack uses the Model Context Protocol (MCP) and works with any MCP-compatible AI app, including Claude, ChatGPT / Codex, Gemini, Copilot, Cursor, and more.

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Substack MCP Server

by Conorbronsdon

Developer ToolsUse Caution4.8MCP RegistryLocal

Free

Server data from the Official MCP Registry

Substack MCP server: posts are draft-only by design; short-form Notes publish immediately.

About

Substack MCP server: posts are draft-only by design; short-form Notes publish immediately.

Security Report

4.8

Use Caution4.8High Risk

This is a well-designed MCP server for Substack with strong architectural safety measures. Authentication is properly required (session token + user ID validated on startup), permissions align with the server's purpose (HTTP network access to Substack API, environment variable usage for credentials), and code quality is good with comprehensive test coverage. Session tokens are stored only in environment variables as intended. The main findings are low-severity: minor error handling could be more granular, and the unofficial Substack API dependency creates a maintenance risk, but these do not pose security vulnerabilities. Supply chain analysis found 3 known vulnerabilities in dependencies (0 critical, 3 high severity). Package verification found 1 issue.

7 files analyzed · 7 issues found

Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.

Permissions Required

This plugin requests these system permissions. Most are normal for its category.

env_vars

Check that this permission is expected for this type of plugin.

HTTP Network Access

Connects to external APIs or services over the internet.

What You'll Need

Set these up before or after installing:

Your Substack publication URL (e.g., https://yourblog.substack.com)Optional

Environment variable: SUBSTACK_PUBLICATION_URL

connect.sid cookie value from your Substack sessionOptional

Environment variable: SUBSTACK_SESSION_TOKEN

Your Substack user IDOptional

Environment variable: SUBSTACK_USER_ID

How to Install

Add this to your MCP configuration file:

{
  "mcpServers": {
    "io-github-conorbronsdon-substack-mcp": {
      "env": {
        "SUBSTACK_USER_ID": "your-substack-user-id-here",
        "SUBSTACK_SESSION_TOKEN": "your-substack-session-token-here",
        "SUBSTACK_PUBLICATION_URL": "your-substack-publication-url-here"
      },
      "args": [
        "-y",
        "@conorbronsdon/substack-mcp"
      ],
      "command": "npx"
    }
  }
}

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Substack MCP Server

About

Security Report

Findings (7)Action required

Permissions Required

What You'll Need

How to Install

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