Retrofit, don’t rebuild: Agentic overlays for transforming legacy enterprise services

Retrofit, don’t rebuild: Agentic overlays for transforming legacy enterprise services

Retrofit, don’t rebuild: Agentic overlays for transforming legacy enterprise services

Original URL: https://aws.amazon.com/blogs/machine-learning/retrofit-dont-rebuild-agentic-overlays-for-transforming-legacy-enterprise-services/

Article Written: June 25, 2026

Added: July 25, 2026

Type: project

Summary

The article discusses the challenges of integrating legacy REST APIs with emerging Agent-to-Agent (A2A) communication standards. It introduces the concept of agentic overlays, which serve as thin wrappers that allow traditional REST services to participate in A2A interactions without rewriting existing business logic. The authors provide reference architectures and sample code to demonstrate how enterprises can adopt A2A capabilities while minimizing operational complexity and maintaining their current infrastructure. This approach aims to facilitate a smoother transition to more autonomous systems in enterprise environments.

💭 Your Thoughts

"Transforms an agentic message into a REST payload, and the reverse." i think this is most team doing for reuse their REST API for agents.

Technologies Referenced