export function createRegistry() {
  const tools = new Map();
  return {
    registerTool(def) {
      if (!def?.name) throw new Error('tool def needs a name');
      if (tools.has(def.name)) throw new Error(`tool "${def.name}" already registered`);
      tools.set(def.name, def);
    },
    getTool(name) { return tools.get(name); },
    listTools() { return [...tools.values()]; },
    // Anthropic tool-use schema — handlers are intentionally stripped.
    toAnthropicTools() {
      return [...tools.values()].map(({ name, description, input_schema }) =>
        ({ name, description, input_schema }));
    }
  };
}