Writing Tool Functions

Tools allow LLMs to call external functions during training. The model learns when and how to use tools through reinforcement learning.

Basic Structure

Every tool function must:

1. Be decorated with @tool
2. Have type hints on ALL parameters
3. Have a docstring
4. Return JSON-serializable data

from rnow.core.tool import tool

@tool
def my_tool(query: str, limit: int = 10) -> dict:
    """Brief description of what this tool does.