Left Hook Word MarkMCP
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Connect to ChatGPT

Requirements: ChatGPT paid plan (Plus, Pro, Team, Business, or Enterprise). MCP is not available on the free plan.
1

Enable Developer Mode

Go to Settings (gear icon) in ChatGPT. Navigate to Apps (or Connectors) → Advanced and toggle Developer mode ON.

2

Create a New App

Go back to Settings → Apps → Create. Fill in the following for each server you want to add:

Left Hook Public MCP

Name:
Left Hook Public MCP
MCP URL:
https://mcp.lefthook.com/mcp
Auth:
None
Description:
Browse the Left Hook integration catalog — APIs, platforms, tools, case studies, and more. Ideal for AI assistants researching integration options.

Left Hook Docs MCP

Name:
Left Hook Docs MCP
MCP URL:
https://mcp.lefthook.com/docs/mcp
Auth:
None
Description:
Search and browse Left Hook technical documentation — guides, API reference, OpenAPI specs, best practices, and SDK docs.
3

Trust and Create

Check the “I trust this provider” checkbox, then click Create.

4

Use in a Chat

Open a new chat. Click the + button in the message bar, select More → Developer Mode, click Add sources, and enable your Left Hook MCP server.

Now you can ask ChatGPT things like:

  • “Search the Left Hook catalog for CRM integrations”
  • “Compare Zapier and Make platforms”
  • “Show me the API reference for webhooks”
  • “What integrations are available for HubSpot?”

Troubleshooting

“OAuth Client ID required” error: Make sure Developer Mode is enabled. This error can appear when the connector wizard expects OAuth, but our servers use no auth.

Server not appearing in chat: Make sure you've added it as a source via the + button → More → Developer Mode → Add sources.

Tools not loading: Try removing and re-creating the connector. ChatGPT caches the tool list from the initial connection.