Substack Newsletter MCP

An MCP server and batch Actor for AI agents to search Substack publications, list newsletter archives, search inside a newsletter, and extract full posts as Markdown with podcast audio URLs. It uses public Substack JSON endpoints without requiring proxies, browsers, logins, or cookies.

Endpoint and access

API key: create a key with the vendor first; your client sends it as an authorization header on every request.

Community listingStreamable HTTPAPI keyEndpoint checked 2026-11-01Published by Mutualistic Labs

You need:authenticate with your Apify API token

MCP endpoint (Streamable HTTP)

https://mutualistic-housing--substack-newsletter-mcp.apify.actor/mcp

Vendor documentation

What you can do with it

Search Substack publications by query
List newsletter archives with keyword search
Extract full post content as Markdown
Retrieve podcast audio URLs from episodes

Source and maintenance

Community listingRegistry 0.1.0

mcp-registry: io.github.dancerdan15/substack-newsletter-mcp@0.1.0 Project website

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks: 1 of 1 (100%)
Average latency: 508 ms
95th percentile latency: 508 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

Nov 1, 2026, 8:32 AM UTC · probe · passed · 508 ms · metadata changed · refuses unauthenticated initialize (HTTP 401)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http substack-newsletter-mcp https://mutualistic-housing--substack-newsletter-mcp.apify.actor/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add substack-newsletter-mcp --url https://mutualistic-housing--substack-newsletter-mcp.apify.actor/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable substack-newsletter-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "substack-newsletter-mcp": {
      "url": "https://mutualistic-housing--substack-newsletter-mcp.apify.actor/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).

Cline configuration

{
  "mcpServers": {
    "substack-newsletter-mcp": {
      "type": "streamableHttp",
      "url": "https://mutualistic-housing--substack-newsletter-mcp.apify.actor/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start substack-newsletter-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "substack-newsletter-mcp": {
      "type": "http",
      "url": "https://mutualistic-housing--substack-newsletter-mcp.apify.actor/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http substack-newsletter-mcp https://mutualistic-housing--substack-newsletter-mcp.apify.actor/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "substack-newsletter-mcp": {
      "url": "https://mutualistic-housing--substack-newsletter-mcp.apify.actor/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "substack-newsletter-mcp": {
      "serverUrl": "https://mutualistic-housing--substack-newsletter-mcp.apify.actor/mcp"
    }
  }
}

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