WriteStack MCP

WriteStack MCP allows AI agents to automate Substack Notes workflows, including drafting notes in the user's voice, scheduling them for optimal times, analyzing performance statistics, and triaging activity notifications. It integrates with connected social channels via Buffer for cross-posting.

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Endpoint and access

OAuth sign-in: the first time you connect, your client opens the vendor's own authorization prompt in a browser.

Vendor evidenceStreamable HTTPOAuth sign-inEndpoint checked 2026-11-01Operated by WriteStack

You need:Connect an MCP client (Claude Desktop or Claude Web, ChatGPT Desktop, or Notion AI) to the MCP endpoint with OAuth, or with a bearer API key from Settings → MCP.

MCP endpoint (Streamable HTTP)

https://www.writestack.io/api/mcp/mcp

Vendor documentation

What you can do with it

Draft and schedule Substack Notes in the creator's voice
Analyze Note performance and subscriber conversion stats
Triage Substack comments, mentions, and replies
Cross-post Notes to LinkedIn, X, or Threads via Buffer

Source and maintenance

Vendor evidenceRegistry 1.0.0

mcp-registry: io.writestack/mcp@1.0.0 Source repository Project website

Maintenance checked: Nov 1, 2026, 4:44 PM UTC

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: 286 ms
95th percentile latency: 286 ms

Maintenance history

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

Nov 1, 2026, 5:00 PM UTC · probe · passed · 286 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 writestack-mcp https://www.writestack.io/api/mcp/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 writestack-mcp --url https://www.writestack.io/api/mcp/mcp

Cursor

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

Cursor configuration

{
  "mcpServers": {
    "writestack-mcp": {
      "url": "https://www.writestack.io/api/mcp/mcp"
    }
  }
}

Cline

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

Cline configuration

{
  "mcpServers": {
    "writestack-mcp": {
      "type": "streamableHttp",
      "url": "https://www.writestack.io/api/mcp/mcp",
      "disabled": false
    }
  }
}

VS Code

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

VS Code configuration

{
  "servers": {
    "writestack-mcp": {
      "type": "http",
      "url": "https://www.writestack.io/api/mcp/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 writestack-mcp https://www.writestack.io/api/mcp/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": {
    "writestack-mcp": {
      "url": "https://www.writestack.io/api/mcp/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": {
    "writestack-mcp": {
      "serverUrl": "https://www.writestack.io/api/mcp/mcp"
    }
  }
}

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