add structured types for tool responses

[Rodriguespn]

Tool responses should be a json with attributes:

• status: If it was successful or not
• message: A message that we want to pass to the LLM about the response
• metadata: Information about the request like user_id, timestap and execution_time
• error_code: The error code, in case of error
• error_message: The error message, In case of error