Railtracks

Use this skill when building agents with railtracks.

Core rules

• Define tools with @rt.function_node and full type hints.
• Write tool docstrings with one-line summary, Args:, and Returns:.
• Create agents with rt.agent_node(...) and only necessary tools.
• Wrap execution in a rt.Flow(...) entry point.

Example

import railtracks as rt

@rt.function_node
def hello_tool(name: str) -> str:
    """Greets a user.
    Args:
        name: User name.
    Returns:
        A greeting string.
    """
    return f"Hello, {name}!"

llm = rt.llm.AnthropicLLM("claude-sonnet-4-6")

GreeterAgent = rt.agent_node(
    "Greeter Agent",
    tool_nodes=[hello_tool],
    llm=llm,
    system_message="You are a helpful assistant that uses tools when needed.",
)

flow = rt.Flow(name="Greeter Flow", entry_point=GreeterAgent)

if __name__ == "__main__":
    print(flow.invoke("Say hello to Ada"))