MCP_TROUBLESHOOTING.md•5.96 kB
# 🔧 ChatGPT MCP Connector Troubleshooting
## The Problem
ChatGPT's MCP connector doesn't recognize your MCP tools, even though your server is working correctly.
## ✅ What We've Verified
Your server IS working:
- ✅ **ngrok URL accessible**: `https://subhorizontal-ortho-vada.ngrok-free.dev`
- ✅ **MCP tools endpoint works**: `/mcp/tools/list` returns tools
- ✅ **Tool execution works**: `/mcp/tools/call` executes successfully
- ✅ **Real data returned**: Live stock market data from Alpha Vantage
## 🎯 Possible Solutions
### **Solution 1: Try Different MCP Discovery URLs**
ChatGPT might expect different discovery endpoints. Try these URLs in your connector:
#### Option A: Base URL (Most Common)
```
https://subhorizontal-ortho-vada.ngrok-free.dev
```
#### Option B: MCP Discovery Endpoint
```
https://subhorizontal-ortho-vada.ngrok-free.dev/mcp
```
#### Option C: MCP Protocol Endpoint
```
https://subhorizontal-ortho-vada.ngrok-free.dev/mcp/protocol
```
#### Option D: Tools List Endpoint
```
https://subhorizontal-ortho-vada.ngrok-free.dev/mcp/tools/list
```
---
### **Solution 2: Check ChatGPT MCP Requirements**
ChatGPT's MCP connector might expect:
1. **Specific MCP Protocol Version**
2. **JSON-RPC 2.0 Format**
3. **Specific Capabilities Declaration**
4. **Server Info Format**
---
### **Solution 3: Add MCP Protocol Compliance**
Let me enhance your server to be more MCP-compliant:
```typescript
// Enhanced MCP Discovery
app.get('/mcp', (req, res) => {
res.json({
jsonrpc: "2.0",
result: {
protocolVersion: "2024-11-05",
capabilities: {
tools: {},
resources: {},
prompts: {}
},
serverInfo: {
name: APP_NAME,
version: "1.0.0"
}
}
});
});
// MCP Tools List (JSON-RPC format)
app.post('/mcp', (req, res) => {
const { method, params } = req.body;
if (method === "tools/list") {
res.json({
jsonrpc: "2.0",
id: req.body.id,
result: {
tools: [
{
name: "topMovers",
description: "Get top gaining, losing, and most actively traded stocks",
inputSchema: {
type: "object",
properties: {
limit: {
type: "number",
description: "Number of results per category",
default: 10
}
}
}
}
]
}
});
} else if (method === "tools/call") {
// Handle tool calls
const { name, arguments: args } = params;
// Your existing tool logic
} else {
res.status(400).json({
jsonrpc: "2.0",
id: req.body.id,
error: {
code: -32601,
message: "Method not found"
}
});
}
});
```
---
### **Solution 4: Test with MCP Client**
Test your server with a proper MCP client to verify protocol compliance:
```bash
# Install MCP client
npm install -g @modelcontextprotocol/cli
# Test your server
mcp-client https://subhorizontal-ortho-vada.ngrok-free.dev
```
---
### **Solution 5: Check ChatGPT Connector Logs**
1. **Open ChatGPT**
2. **Go to Settings** → **Connectors**
3. **Check the connector status**
4. **Look for error messages**
---
## 🧪 Testing Commands
Test each endpoint to see which one ChatGPT recognizes:
```bash
# Test 1: Base URL
curl https://subhorizontal-ortho-vada.ngrok-free.dev
# Test 2: MCP Discovery
curl https://subhorizontal-ortho-vada.ngrok-free.dev/mcp
# Test 3: MCP Protocol
curl https://subhorizontal-ortho-vada.ngrok-free.dev/mcp/protocol
# Test 4: Tools List
curl https://subhorizontal-ortho-vada.ngrok-free.dev/mcp/tools/list
# Test 5: Tool Call
curl -X POST https://subhorizontal-ortho-vada.ngrok-free.dev/mcp/tools/call \
-H "Content-Type: application/json" \
-d '{"name":"topMovers","arguments":{"limit":3}}'
```
---
## 🔍 Debugging Steps
### Step 1: Check ngrok Status
```bash
open http://127.0.0.1:4040
```
Look for:
- ✅ Tunnel is active
- ✅ No errors in logs
- ✅ Requests are coming through
### Step 2: Test Local vs ngrok
```bash
# Local test
curl http://localhost:3000/mcp/tools/list
# ngrok test
curl https://subhorizontal-ortho-vada.ngrok-free.dev/mcp/tools/list
```
Both should return the same result.
### Step 3: Check ChatGPT Connector Settings
1. **Verify URL format** (no trailing slash)
2. **Check authentication** (if using OAuth)
3. **Verify connector status** (should be "Connected")
---
## 🎯 Most Likely Solutions
### **Try This First:**
```
https://subhorizontal-ortho-vada.ngrok-free.dev
```
(Just the base URL, no path)
### **If That Doesn't Work:**
```
https://subhorizontal-ortho-vada.ngrok-free.dev/mcp
```
### **If Still Not Working:**
The issue might be:
1. **ChatGPT expects different MCP protocol version**
2. **Authentication required** (try OAuth)
3. **Rate limiting** from ngrok free tier
4. **ChatGPT connector bug** (beta feature)
---
## 🚀 Quick Fix Attempt
Let's try restarting everything with a fresh ngrok tunnel:
```bash
# 1. Stop everything
./shutdown-all.sh
# 2. Start fresh
./start.sh
# 3. Start ngrok with new URL
ngrok http 3000
# 4. Get new URL
./get-ngrok-url.sh
# 5. Try new URL in ChatGPT connector
```
---
## 📞 Next Steps
1. **Try the different URLs** listed above
2. **Check ChatGPT connector logs** for specific error messages
3. **Test with a fresh ngrok tunnel**
4. **Consider adding OAuth** if authentication is the issue
---
## 💡 Alternative: Use ChatGPT Actions Instead
If MCP connector continues to have issues, you can use **ChatGPT Actions** with OpenAPI:
1. **Go to ChatGPT** → **Create Custom GPT**
2. **Add Action** with OpenAPI schema
3. **Use your ngrok URL** as the server
4. **Define the API endpoints** in OpenAPI format
This approach is more reliable than MCP connectors (which are still in beta).
---
**Let me know which URL works or what error message you see in ChatGPT!** 🔧