Retrofit, don’t rebuild: Agentic overlays for transforming legacy enterprise services
Evolving story · 1 updatesAWS Agentic Overlays for Legacy Enterprise ServicesTimeline →AWS and collaborators introduce agentic overlays to convert legacy REST services into A2A-compatible agents using MCP, enabling enterprise integration without code rewrites or infrastructure duplication.
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 serv
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