API Problems
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Validation Error

Error response when a request fails input validation

The API returns a 400 Bad Request status with this problem type when the request payload is invalid.

Response Format

{
  "type": "https://docs.tambo.co/reference/problems/validation",
  "status": 400,
  "title": "Bad Request",
  "detail": "Initial message at index 0 must have content",
  "instance": "/threads"
}

Fields

  • type - Stable URI identifying this problem type
  • status - HTTP status code (always 400)
  • title - Short summary of the problem (always Bad Request)
  • detail - Human-readable description of what was invalid
  • instance - The specific request path that triggered this error

Handling

When you receive this error:

  1. Read the detail field to see what failed validation
  2. Update your request payload to match the expected schema
  3. Retry the request

See Also

Reasoning Models

Configure and use advanced reasoning capabilities in models that show their thinking process.

Not Found

Error response when a requested resource does not exist

On this page

Response FormatFieldsHandlingSee Also