OnFailure

Type for specifying failure handling behavior.

Can be either:

• A literal action string ('error' or 'continue')
  • 'error': Re-raise the exception, stopping agent execution.
  • 'continue': Inject a message with the error details, allowing the agent to continue. For tool retries, a ToolMessage with the error details will be injected. For model retries, an AIMessage with the error details will be returned.
• A callable that takes an exception and returns a string for error message content