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MCP article

Connecting AI Clients to MCP

DoubleScale generates ready-to-paste connection snippets for popular MCP clients. All snippets point at your site’s MCP endpoint and include the Authorization header your client needs.

General rules

  • One key per client — Create separate API keys for Claude Code, Cursor, etc. Revoke one without breaking the others.
  • Treat snippets like passwords — They contain your API key. Do not commit them to Git, paste them in public chats, or share screenshots.
  • Use a reachable URL — A localhost endpoint only works on the same machine. Remote clients need your public site URL.
  • Restart clients after changes — Many MCP clients cache the tool list at connect time. Fully quit and reopen the app after enabling MCP or changing keys.

Claude Code

Run the snippet in your terminal:

claude mcp add 
  --transport http 
  doublescale https://yoursite.com/wp-json/doublescale/mcp 
  --header "Authorization: Bearer YOUR_API_KEY"

Claude Code connects directly over HTTP — no Node helper required.

Cursor

Add to Cursor’s MCP config (Settings → Tools & MCP):

{
  "mcpServers": {
    "doublescale": {
      "url": "https://yoursite.com/wp-json/doublescale/mcp",
      "headers": {
        "Authorization": "Bearer YOUR_API_KEY"
      }
    }
  }
}

Claude Desktop

Add to claude_desktop_config.json:

  • macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
  • Windows: %APPDATA%Claudeclaude_desktop_config.json

Claude Desktop uses the mcp-remote Node helper. You need Node.js installed (node -v should work in a terminal).

On Windows, DoubleScale’s snippet routes through cmd /c and passes the auth header via an environment variable — both are required because Windows splits paths and headers at spaces.

OpenAI Codex

Add to ~/.codex/config.toml. Codex also uses the mcp-remote helper and requires Node.js.

Other MCP clients

Any client that supports HTTP transport with custom headers can connect:

  • Endpoint: https://yoursite.com/wp-json/doublescale/mcp
  • Transport: HTTP (JSON-RPC 2.0)
  • Header: Authorization: Bearer YOUR_API_KEY (or Basic for Application Passwords)

Emailing setup instructions

After creating a key, you can email setup steps to the key owner from the MCP settings page. By default the email contains configuration instructions only — not the key itself. Check “Include the key itself in the email” only if you accept the security trade-off (keys in inboxes persist in backups and mail providers).

Quill Forms integration

DoubleScale and Quill Forms share the same integration path: form submissions flow into DoubleScale contacts and can trigger automations. MCP does not replace the Quill Forms connector — it gives AI agents access to CRM data after submissions are already in DoubleScale. Install DoubleScale, connect Quill Forms under DoubleScale → Integrations, then use MCP to query or act on the contacts those forms create.