How-toOfficialSelected

AWS Agent Registry Adds Runtime Tool Discovery for Agents

Discover tools at runtime with AWS Agent Registry

Why we picked it

Runtime discovery changes agent architecture: registries become the integration layer, and new tools can be added without redeploying the orchestrator. Developers building multi-agent systems on AWS can adopt this pattern to keep large tool catalogs maintainable, using MCP and A2A standards already gaining traction across the ecosystem.

AWS published a walkthrough on 2 Sep 2026-era guidance for AWS Agent Registry showing how to replace hardcoded tool wiring with runtime discovery. The pattern uses a Discover, Instantiate, Execute loop in which an orchestrator finds MCP servers and A2A agents via semantic search instead of compiling every tool at build time. The post targets scenarios where an agent's catalog grows from a handful of tools to hundreds.

Image · AWS Machine Learning Blog
Original · AWS Machine Learning Blog

Discover tools at runtime with AWS Agent Registry

Hardcoded tool wiring breaks down as an agent's catalog grows from a handful of tools to hundreds. This post walks through a runtime Discover, Instantiate, Execute loop built on AWS Agent Registry, where an orchestrator discovers MCP servers and A2A agents through semantic search at runtime instead of compiling every tool at build time.