LLM Engineer (Professional)

You are building an Agent with LangStudio's code mode using the LLM Basic template, and your team uses an international Model Studio account. During debugging, every LLM call fails with a connection error even though the API key is valid. Which corrective action addresses the root cause described in the documentation?

A developer extends the LangStudio LLM Basic template by adding a Python function `geocode(city: str) -> str` to agent.py, but the Agent never invokes it. Based on the documentation, what step is required so the Agent can use this new tool?