Error when attempting to connect my Remote MCP in new Agent Builder

API
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41

I also face the same issue while connecting to MCP server. Anyone able to fix this ?

{
“error”: {
“message”: “Error retrieving tool list from MCP server: ‘https://*******.onrender.com/mcp.json’. Http status code: 424 (Failed Dependency)”,
“type”: “external_connector_error”,
“param”: “tools”,
“code”: “http_error”
}
}

42

I’m still having issues! Not able to connect to databricks MCP… and the MCP works with claude code and openai via code, but not Openai agent builder

44

I am still experiencing the same behavior using standard Zapier MCP with Agent builder. Has anybody else managed to make it work?

45

Not sure if a fix has been discovered. I’m still running into connections issues using Cloudflare Workers.

46

I was able to successfully connect then the workflow bricked and said “Workflow not found”
WTF - super aggrevating.

The mcp tools schema must be json - if you ended up using zod, my experience was it 400s

47

Also beware if you try to use header auth for a remote MCP - it seems to pretty consistently break the workflow and give the dreaded ‘workflow not found’ message. You can’t even edit your workflow anymore at that point so effectively data loss.

48

Hey everyone, Apologies for the inconvenience this has caused. We are re-engaging our engineering team to resolve this for you and we will update you very shortly with the progress. Thank you!

49

Hi everyone, this should be resolved now! Let us know if you're still blocked here and we'll take a look. Thank you for all your patience.

50

I am having the same issues still.

When loading the tools I get this error:

image
image2537×930 114 KB

The MCP inspector is working fine, when asking manually through postman it’s working fine.

51

Hi Team, Still facing the issue.

{
  "error": {
    "message": "Error retrieving tool list from MCP server: 'https://malxxx-xxx-xxx.ngrok-free.dev/mcp'. Http status code: 424 (Failed Dependency)",
    "type": "external_connector_error",
    "param": "tools",
    "code": "http_error"
  }
}

when i tried call the list_actions via postman getting below error 
{
    "error": {
        "message": "The server had an error processing your request. Sorry about that! You can retry your request, or contact us through our help center at help.openai.com if you keep seeing this error. (Please include the request ID 86f2520e-3837-4ac9-b70d-83b3470449db in your email.)",
        "type": "server_error",
        "param": null,
        "code": null
    }
}
52

I had the HTTP streamable (/mcp) issue before the fix, now works. So, it might be something on your MCP server side guys.
I suggest using MCP Inspector to debug, if all good in here, Agent Builder MCPs should work.

53

+1 here. Problem is still there and I don’t think its the MCP of all of us.

54

+1, stil getting the same issue. “Unable to load tools”

55

I only started getting this issue today. My MCP tool (not node) is being very inconsistent, sometimes taking ages to load my Zapier MCP Tools, other times failing to load it, and then sometimes loading it and it working. Within the test chats I’ve been running, I get Workflow failed: Error retrieving tool list from MCP server, Http status code: 424 (Failed Dependency). (code: user_error)".

56

Still getting the same issue

57

Hey everyone, After the fix the issue is majorly resolved for most of the developers. At this moment, if you are still facing issue, please open a request with us at support@openai.com. Make sure to include your forum username and we will look into it individually since we might need some more personal details. Hope that helps. Thank you!