How can I connect MCP Memory Service (Cloudflare-hosted) with ChatGPT?

[iroshandezilva]

I’m currently using the MCP Memory Service hosted via the Cloudflare option, and I’ve successfully set up and verified that the memory service itself is running correctly.

What I’m struggling with is understanding how to connect this MCP memory service with ChatGPT (or a ChatGPT-based client/agent).

If anyone has implemented this already, or if there’s documentation or a reference I may have missed, I’d really appreciate being pointed in the right direction.

Thanks in advance for any help or guidance.

[doobidoo]

How to Connect Your Cloudflare MCP Memory Service to ChatGPT

Great news! ChatGPT has full MCP support as of September 2025, so you can connect your Cloudflare-hosted MCP Memory Service directly.

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Quick Setup Guide

Step 1: Enable ChatGPT Developer Mode

1. Open ChatGPT (web interface)
2. Navigate to: Settings → Connectors → Advanced → Developer Mode
3. Enable Developer Mode

Requirements:

• ChatGPT Pro, Plus, Business, Enterprise, or Education account
• Web interface only (mobile not yet supported)

Step 2: Add Your MCP Server

1. In the Connectors settings, click "Add MCP Server" or "Import Remote MCP Server"
2. Configure your Cloudflare deployment:

Configuration Example:

{
  "name": "MCP Memory Service",
  "url": "https://your-cloudflare-worker.workers.dev/mcp",
  "transport": "streaminghttp",
  "auth": {
    "type": "bearer",
    "token": "your-api-key"
  }
}

Important URLs:

• MCP Endpoint: https://your-worker.workers.dev/mcp (Streaming HTTP/SSE)
• Not: /api/events or other REST endpoints

Step 3: Test the Connection

Once added, ChatGPT will have access to all your MCP Memory Service tools:

• memory_store - Store new memories
• memory_search - Semantic search
• memory_list - Browse memories
• memory_delete - Remove memories
• Plus all other MCP tools (quality, consolidation, graph operations, etc.)

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Authentication Options

ChatGPT MCP supports three authentication methods:

Option 1: Bearer Token (Recommended)

{
  "auth": {
    "type": "bearer",
    "token": "your-cloudflare-api-key"
  }
}

Option 2: OAuth 2.1
If your Cloudflare deployment has OAuth enabled:

{
  "auth": {
    "type": "oauth",
    "client_id": "your-client-id",
    "authorization_url": "https://your-worker.workers.dev/oauth/authorize"
  }
}

Option 3: No Authentication
If your deployment is public/internal-only:

{
  "auth": {
    "type": "none"
  }
}

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Supported Transport Protocols

ChatGPT MCP supports:

• ✅ Streaming HTTP (recommended for Cloudflare Workers)
• ✅ SSE (Server-Sent Events)
• ✅ Both read and write operations

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Verification Steps

After adding your MCP server:

1. Check Connection Status: Look for a green indicator next to your MCP server in Connectors
2. Test in Chat: Try asking ChatGPT to search your memories:
   • "Search my memories for information about authentication"
   • "Store this memory: I prefer TypeScript for new projects"
3. View Available Tools: ChatGPT should show your MCP tools when it uses them

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Troubleshooting

Connection Failed

Check 1: Verify Endpoint

curl -i https://your-worker.workers.dev/api/health
# Should return 200 OK

Check 2: Test MCP Endpoint

curl -i https://your-worker.workers.dev/mcp
# Should return MCP protocol response

Check 3: Authentication

curl -H "Authorization: Bearer your-api-key" \
     https://your-worker.workers.dev/api/health
# Should return 200 OK if auth is correct

CORS Issues

If you see CORS errors, ensure your Cloudflare Worker has proper CORS headers:

// In your Cloudflare Worker
headers: {
  "Access-Control-Allow-Origin": "https://chat.openai.com",
  "Access-Control-Allow-Methods": "GET, POST, OPTIONS",
  "Access-Control-Allow-Headers": "Content-Type, Authorization"
}

Authentication Errors

• Verify your API key is correct
• Check that your Cloudflare deployment accepts Bearer tokens
• Test authentication with curl first before configuring ChatGPT

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What You Get

With MCP integration, ChatGPT can:

• ✅ Automatically store important information from your conversations
• ✅ Retrieve relevant memories when needed for context
• ✅ Search semantically across all your stored memories
• ✅ Manage memories (update, delete, organize with tags)
• ✅ Use quality scoring and consolidation features
• ✅ Access knowledge graph relationships

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Documentation & Resources

OpenAI MCP Documentation:

• Building MCP Servers for ChatGPT
• Developer Mode Guide
• ChatGPT Connectors
• MCP Server Deployment

MCP Memory Service Documentation:

• Multi-Client Setup Guide
• HTTP API Reference
• Cloudflare Deployment

Additional Reading:

• InfoQ: OpenAI Adds Full MCP Support
• Model Context Protocol Guide 2026

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Need More Help?

If you run into issues:

1. Share your Cloudflare Worker URL (without sensitive tokens)
2. Describe the error message you're seeing
3. Let us know which authentication method you're using

The community here can help troubleshoot specific configuration issues!

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TL;DR: Enable Developer Mode in ChatGPT → Add your Cloudflare MCP endpoint → ChatGPT now has full access to your memory service 🎉