Runtime tool discovery with AWS Agent Registry
In brief
- AWS Agent Registry enables runtime semantic discovery of MCP tools and A2A agents without hardcoding endpoints.
- Protocol descriptors provide connection metadata but exclude invocation credentials, managed separately.
- Three demo scenarios illustrate single MCP calls, MCP + A2A chains, and semantic resolution of ambiguous intents.
Amazon introduces AWS Agent Registry, a managed service to catalog and discover MCP servers and A2A agents at runtime. According to the company, hardcoded tool wiring becomes unmanageable as the catalog grows beyond a few dozen tools, especially in systems exposing hundreds of internal APIs.
The service enables an orchestrator to semantically search for approved capabilities through a Discover → Instantiate → Execute loop, avoiding recompilation or redeployment. Protocol descriptors (MCP or A2A) include connection metadata but not invocation credentials, which are handled separately. A demo showcases three scenarios: a single MCP call, an MCP + A2A chain, and semantic resolution of ambiguous intent.
This approach targets enterprises with large internal API catalogs, where adding new capabilities no longer requires modifying the orchestrator's code or coordinated deployments. The service integrates with Amazon Bedrock AgentCore, Cognito, and Secrets Manager, but its effectiveness depends on description quality and search query relevance.
What it changes for you
- Public SectorGovernment agencies could integrate new internal APIs without modifying the orchestrator or redeploying, speeding up agent adoption for public services.
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