Agentic Overlays Transform Legacy Services for AI Integration

Renuka Kumar· June 25, 2026 View original

▶ The 2-minute explainer

Summary

A technical collaboration between AWS and authors introduces agentic overlays, thin wrapper layers that enable traditional REST-based services to act as AI agents. This solution allows enterprises to add agent-to-agent (A2A) capabilities to existing services without extensive refactoring or new infrastructure.

A new technical approach, developed in collaboration with AWS, proposes "agentic overlays" as a method to modernize legacy enterprise services for AI integration. These overlays function as lightweight wrappers that convert standard REST APIs into intelligent agents. This transformation allows existing services to engage in agent-to-agent interactions, effectively extending their capabilities without requiring a complete overhaul of the underlying business logic. The core benefit of this solution is its ability to integrate AI agent functionalities into established systems efficiently. By exposing REST APIs as tools compatible with the Model Context Protocol (MCP), enterprises can avoid costly code duplication and the need for parallel infrastructures. This strategy promotes the reuse of existing services, thereby mitigating the issue of agent sprawl within an organization's technical environment. Reference architectures and sample code are provided to guide implementation.

Why it matters

This solution offers a pragmatic way for enterprises to leverage AI agents with their existing, often complex, legacy systems, significantly reducing the cost and complexity typically associated with such modernization efforts.

How to implement this in your domain

  1. 1Identify legacy REST services that could benefit from AI agent integration.
  2. 2Review the provided reference architectures and sample code for agentic overlays.
  3. 3Develop thin wrapper layers to transform selected REST APIs into AI-compatible tools.
  4. 4Integrate these agentic overlays with your AI agent orchestration platform.
  5. 5Test the A2A interactions to ensure seamless communication and functionality.

Who benefits

Enterprise ITFinancial ServicesHealthcareManufacturingGovernment

Key takeaways

  • Agentic overlays enable AI agent integration with legacy REST services.
  • This approach avoids costly refactoring and parallel infrastructure.
  • Existing services can be reused as agents, reducing agent sprawl.
  • The Model Context Protocol (MCP) facilitates tool compatibility for AI agents.

Original post by Renuka Kumar

"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…"

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