VAPI•4w ago

Workflow - Endcall node - each value in nodes.tool.server.credentialId must be a UUID

When adding a new endcall node and set a message my node server.credentialId gets "" and I can't save it. Same when I'm editing an exisiting endcall node message I can't save it anymore because of this error.

Vapi Support BotAPP•11/27/25, 10:57 AM

To resolve the "credentialId must be a UUID" error when saving your End Call node, ensure that the field is either omitted or set to a valid UUID string, not an empty string.

For example:

If you do not require a credential, try removing the
credentialId
credentialId
property entirely from the node's configuration before saving.
For more on node configuration, see the Workflows overview.

Source:

Workflows overview

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rubber-blueOP•11/27/25, 11:45 AM

I can't edit this variable

rubber-blueOP•11/27/25, 11:45 AM

I only have message

rubber-blueOP•11/27/25, 11:47 AM

when I add as a node

rubber-blueOP•11/27/25, 11:47 AM

as soon as I add a message

rubber-blueOP•11/27/25, 11:48 AM

and my credentialId is ""

rubber-blueOP•11/27/25, 11:49 AM

what I added yesterday looked like this. but somehow if I add new or edit the old one I get this Server object

rubber-blueOP•11/27/25, 11:53 AM

and same with my api request. If I modify I get this error

conventional-black•12/1/25, 10:20 AM

same with my api request in workflow, any update on this ?

skinny-azure•12/1/25, 11:06 AM

I'm hoping for an update because my workflows are stopped working because of this and I'm trying to convert them into single prompt agents and they don't even work since they're so different

rubber-blueOP•12/1/25, 3:47 PM

I using single promt agents now. And converted my api call to custom tool

conventional-black•12/2/25, 12:03 PM

this worked for me:

Create a tool for the API call and replace the API request node in your flow with the tool.

Workflow - Endcall node - each value in nodes.tool.server.credentialId must be a UUID

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