Feb 22 • ❓ Q&A
n8n MCP
Hi! Recently installed A0 on my Unraid server as a Docker contiainer. I have been using n8n for about a year and would love to be able to grant A0 access to my workflows! I'm able to do it as a webhook but would much prefer the flexibility and ease of exposing them as an MCP server. Has anyone been able to make that connection work? I've spent the past 4 hourse getting only errors.
I use the n8n JSON config in A0 MCP Server:
{
"mcpServers": {
"n8n-mcp": {
"command": "npx",
"args": [
"-y",
"supergateway",
"--streamableHttp",
"--header",
"authorization:Bearer <YOUR_ACCESS_TOKEN_HERE>"
]
}
}
}
it "connects" but the log shows 404s:
[supergateway] Starting...
[supergateway] Supergateway is supported by Supermachine (hosted MCPs) - https://supermachine.ai
[supergateway] - outputTransport: stdio
[supergateway] - streamableHttp: http://192.168.4.36:5678/mcp-server/http
[supergateway] - Headers: {"authorization":"Bearer MY_SECRET_TOKEN"}
[supergateway] Connecting to Streamable HTTP...
[supergateway] Stdio server listening
[supergateway] Stdio → Streamable HTTP: {
jsonrpc: '2.0',
id: 0,
method: 'initialize',
params: {
protocolVersion: '2025-06-18',
capabilities: {},
clientInfo: { name: 'mcp', version: '0.1.0' }
}
}
[supergateway] Streamable HTTP connected
[supergateway] Response: {
jsonrpc: '2.0',
id: 0,
result: {
protocolVersion: '2025-06-18',
capabilities: { tools: [Object] },
serverInfo: { name: 'n8n MCP Server', version: '1.0.0' }
}
}
[supergateway] Streamable HTTP → Stdio: { jsonrpc: '2.0', method: 'notifications/initialized' }
[supergateway] Stdio → Streamable HTTP: { jsonrpc: '2.0', id: 1, method: 'tools/list' }
[supergateway] Streamable HTTP error: StreamableHTTPError: Streamable HTTP error: Failed to open SSE stream: Not Found
at StreamableHTTPClientTransport._startOrAuthSse (file:///root/.npm/_npx/85d60ba1adc82a16/node_modules/@modelcontextprotocol/sdk/dist/esm/client/streamableHttp.js:105:23)
at process.processTicksAndRejections (node:internal/process/task_queues:105:5) {
code: 404
}
[supergateway] Streamable HTTP error: StreamableHTTPError: Streamable HTTP error: Failed to open SSE stream: Not Found
at StreamableHTTPClientTransport._startOrAuthSse (file:///root/.npm/_npx/85d60ba1adc82a16/node_modules/@modelcontextprotocol/sdk/dist/esm/client/streamableHttp.js:105:23)
at process.processTicksAndRejections (node:internal/process/task_queues:105:5) {
code: 404
}
[supergateway] Response: {
jsonrpc: '2.0',
id: 1,
result: { tools: [ [Object], [Object], [Object] ] }
}
[supergateway] stdin closed. Exiting...
0
0 comments
n8n MCP
Leaderboard (30-day)
1
+6
2
+3
3
+3
4
+2
5
+1
Powered by