"""Central registry for tool handlers.
Handlers register themselves at import time. The RequestProcessor
uses this registry to dispatch tool requests to the correct handler.
"""
from typing import Any, Callable
_handlers: dict[str, Callable[..., Any]] = {}
def register_handler(name: str, handler: Callable[..., Any]) -> None:
"""Register a handler function for a tool name."""
if name in _handlers:
raise ValueError(f"Handler already registered: {name}")
_handlers[name] = handler
def get_handler(name: str) -> Callable[..., Any]:
"""Get handler by name. Raises KeyError if not found."""
if name not in _handlers:
raise KeyError(f"Unknown handler: {name}")
return _handlers[name]
def execute(tool_name: str, arguments: dict[str, Any]) -> Any:
"""Execute a tool handler with arguments."""
handler = get_handler(tool_name)
return handler(**arguments)
