from __future__ import annotations

from typing import Any


def validate_tool_spec(spec: dict[str, Any]) -> None:
    name = spec["name"]
    target = spec["execution_target"]

    if not (name.startswith("ui.") or name.startswith("srv.")):
        raise ValueError("Tool name must be in ui.* or srv.* namespace")

    if name.startswith("ui.") and target != "frontend":
        raise ValueError("ui.* must use frontend target")
    if name.startswith("srv.") and target != "backend":
        raise ValueError("srv.* must use backend target")