Issue connecting n8n ai agent (cloud) with external mcp server

Questions
1

Problem:

  • my setup:
  • n8n Cloud (trial or paid)
  • Using AI Agent with MCP Client Tool
  • MCP server is Composio (public HTTP stream URL)
  • The error is “Could not connect to your MCP server”
  • I access the MCP stream URL from your browser**, so the server is not the issue.

Error message:
{
“errorMessage”: “Could not connect to your MCP server”,
“errorDetails”: {},
“n8nDetails”: {
“itemIndex”: 0,
“time”: “7/25/2025, 4:18:40 PM”,
“n8nVersion”: “1.103.1 (Cloud)”,
“binaryDataMode”: “filesystem”
}
}

Does n8n Cloud support connecting to external MCP servers like Composio via the MCP Client Tool inside the AI Agent? Are there known limitations or special setup steps?

2

You can create a Webhook Workflow directly in n8n instead of using Composio, and use that Webhook URL as the MCP URL in the AI Agent configuration.

3

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