This always happens when I edit API requests

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The error occurs because the

credentialId

in your API request tool must be a valid UUID, not a custom string. To fix this: 1. Go to your Vapi dashboard and create a new custom credential (e.g., Bearer Token, OAuth 2.0, or HMAC). 2. Copy the generated UUID and use it in your configuration like this:

json
"server": {
  "url": "https://your-server.com/webhook",
  "credentialId": "550e8400-e29b-41d4-a716-446655440000"
}

This should resolve the workflow save error. Reference: Vapi documentation on [server authentication](https://docs.vapi.ai/server-url/server-authentication). Source: - [Server authentication](https://docs.vapi.ai/server-url/server-authentication)

this is useless

Hi Tayseer, Vapi Workflows have been deprecated and will not receive further updates. We recommend migrating to Vapi Squads, which are more capable and reliable and are the supported path going forward. You can learn more about Squads here: [https://docs.vapi.ai/squads](https://docs.vapi.ai/squads) Thank you.