Connect to the n8n MCP server using SSE.

[An0nymous0]

Please do a quick search on GitHub issues first, the feature you are about to request might have already been requested.

Expected Behavior

yaml config

    mcp:
      client:
        toolcallback:
          enabled: true
        stdio:
          servers-configuration: classpath:mcp.json
        sse:
          connections:
            server1: http://localhost:5678/mcp/get_user_info/sse

spring error

Factory method 'mcpSyncClients' threw exception with message: Failed to wait for the message endpoint

n8n mcp server config

Current Behavior

Currently, it can only be accessed via stdio.

Context

[tzolov]

@An0nymous0 how to reproduce this issue. Is there a easy way to create n8n instance with mcp server

[An0nymous0]

@An0nymous0 how to reproduce this issue. Is there a easy way to create n8n instance with mcp server

1. Visit this address (a simple example):

   https://n8n.io/workflows/3514-build-an-mcp-server-with-google-calendar-and-custom-functions/

2. Click on "Use Free."

3. Get started for free with n8n Cloud.

4. "My Functions Server" is an MCP server.

This will create an n8n MCP instance.

[denniskawurek]

Hi @tzolov ,
I saw this issue and was wondering whether this is related to the URI resolution problem as described here: modelcontextprotocol/java-sdk#261
At least the error message indicates that the closeLatch in HttpClientSseTransport wasn't called, because of a failed connection attempt to the SSE endpoint.

[denniskawurek]

@An0nymous0 I re-checked this and asked myself if the format of your config is maybe wrong?

The documentation shows that it should be something like this:

        sse:
          connections:
            server1:
              url: http://localhost:5678
              sse-endpoint: /mcp/get_user_info/sse

Could you try this, please? Without warranty as there are few problems with URI resolutions in the underlying library.