I have run into an issue that may be related to this. It seems to have appeared only in the past few days? The forum is only letting me upload one image at once and I also apparently can’t include links? Here’s a Google Doc ID:
1e4lCHC1YDakYrTfccXhq-RrWLNfiIxRv521H_Z-eofY
If you open any Google Doc, just replace the string of numbers/letters after /d with this and you should be able to access the images.
I can confirm that my MCP server works properly with terminal testing. Sometimes, my tools lists show up properly in the Agents Builder interface (Image 1).
Other times, I get this message - Unable to load tools (Image 2).
That message often hangs for a few seconds before converting into the proper tools list. Sometimes even after having successfully connected the MCP server, if I come back 10 minutes later, I will first see that error message.
Then when I actually try to test the flow, even once the tools list is showing up properly, I am hitting 424 errors:
Workflow failed: Error retrieving tool list from MCP server: 'cust_service_mcp'. Http status code: 424 (Failed Dependency). (code: user_error)
Sometimes I get it to run the tool call (Image 3).
But other times, it hangs before even getting to the tool call (Images 4-5). This holds for both tools I display in various screenshots.
This is all for a custom MCP deployed through GCP, and when I look at the logs nothing is actually hitting the endpoint at all. (For testing, the function call itself doesn’t require authentication, but has API key authentication built into the MCP source code - so it’s clearly not a matter of the endpoint being unreachable, especially given that I can get the tools list some of the time.)
Any help would be greatly appreciated!