Discover tools at runtime with AWS Agent Registry

This article explains how AWS Agent Registry enables runtime discovery of tools and agents, solving the problem of managing hundreds of internal APIs in enterprise systems.

• Runtime discovery allows orchestrators to search and dynamically instantiate tools without hardcoding endpoints
• Registry stores searchable descriptions and protocol-specific descriptors for MCP servers and A2A agents
• Discover-Instantiate-Execute loop: search Registry, parse descriptors, create clients, build request-scoped agent
• Approval workflows separate publishers from approvers using IAM permissions
• Authentication remains separate from discovery; credentials obtained through trusted configuration paths
• Hybrid semantic and keyword search retrieves relevant capabilities without prompt stuffing
• Supports cross-account sharing and organization-wide discovery through AWS Organizations
• Decouples capability deployment from orchestrator releases and code changes

AWS Agent Registry enables scalable, governed discovery of agentic capabilities across enterprise systems while maintaining security and operational independence.