AWS Demonstrates Runtime Tool Discovery with AWS Agent Registry

AWS published a Python example showing how agents can use AWS Agent Registry to discover approved MCP servers and A2A agents at runtime, create clients from their descriptors, and execute requests through a temporary inner agent. The sample handles order status, pricing, and returns using a discover, instantiate, and execute loop. Only records that complete the configured approval workflow are available through the registry’s discoverable data plane. Search results do not include invocation credentials or authentication schemes, so the sample obtains invocation credentials separately. AWS also explains approval workflows and search evaluation, while noting that build-time wiring can suit small catalogs and that a deterministic flow is more straightforward when the same capabilities always run in a fixed order.

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