AWS教你怎么给旧REST服务套个Agentic Overlays壳，不用重写代码就能变A2A智能体、兼容MCP，比从头建省事多了。
AWS博客提出Agentic Overlays方案，通过薄包装层将传统REST服务转化为支持A2A交互的智能体。该方案同时使REST API兼容Model Context Protocol (MCP)，作为工具暴露。企业无需重写业务逻辑、重复代码或运行并行基础设施。博客提供参考架构和示例代码，帮助减少基础设施中的智能体膨胀。
Retrofit, don’t rebuild: Agentic overlays for transforming legacy enterprise services
In this technical collaboration between AWS and the authors, we present a pragmatic solution: agentic overlays. Agentic overlays are thin wrapper layers that transform traditional REST-based services into agents capable of participating in A2A interactions. They also expose REST APIs as tools compatible with the Model Context Protocol (MCP). Together, they let enterprises add A2A capabilities to existing REST services without rewriting business logic, without duplicating code, and without running parallel infrastructures. This reduces agent sprawl in the infrastructure by reusing existing services as agents. We provide reference architectures and sample code that show how to build agentic overlays.