示例：ToolRegistry

export class ToolRegistry {
  private tools = new Map<string, Tool>()

  register(tool: Tool) {
    if (this.tools.has(tool.name)) {
      throw new Error(`Duplicate tool: ${tool.name}`)
    }
    this.tools.set(tool.name, tool)
  }

  get(name: string): Tool {
    const tool = this.tools.get(name)
    if (!tool) {
      throw new Error(`Unknown tool: ${name}`)
    }
    return tool
  }

  toSchemas() {
    return [...this.tools.values()].map(tool => ({
      name: tool.name,
      description: tool.description,
      input_schema: tool.schema.toJSON(),
    }))
  }
}

这个注册表只做注册、查找和 schema 输出。权限、执行、UI 都不应该塞进这里。