[agents] traces for llm tools are incomplete

In PXI, our tracing for LLM spans currently lack all of the necessary attributes for **mounted** LLM tools. As a result, LLM tools that are **available** to the LLM are not displayed. We only render the json schema in the screenshot below. We need to additionally render the name, description, etc., and other relevant attributes. <img width="753" height="417" alt="Image" src="https://github.com/user-attachments/assets/ef613f45-1239-4cb0-af91-76eee8911aa4" />