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Automating AWS Agent Registry updates with push-based architecture

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Automating AWS Agent Registry updates with push-based architecture

Every time a Model Context Protocol (MCP) server published in the AWS Agent Registry, a capability of Amazon Bedrock AgentCore, gains a new tool or updates its schema, the registry record must be updated too. Without automated push-based sync, consumers discover stale metadata. For organizations managing multiple MCP servers across accounts, such a sync keeps catalog records current within an existing governance workflow.

In most enterprise deployments, a catalog’s value depends on its freshness. If a developer deploys a new tool on Monday, but the registry record still reflects last week’s schema, consumers lose trust in the catalog. Stale metadata directly reduces registry reliability, leading teams to inadvertently build dependencies on inaccurate information.

When an engineer adds a tool to an MCP server but forgets to update the catalog:

Multiplied across teams, this lack of automation erodes trust in the registry. Organizations ultimately fall back on ad hoc discovery mechanisms like hardcoded endpoints, informal knowledge sharing, and stale documentation.

In this post, we outline an event-driven architecture that automates these updates using AWS CloudTrail, Amazon EventBridge, and AWS Lambda.

The following solution brings these services together into an event-driven pipeline that detects runtime changes and synchronizes them to the registry automatically.

The sample uses two accounts, but you can scale the architecture for multiple accounts, with Account A as the registry account and multiple AWS accounts similar to Account B for different MCP servers.

The following diagram shows the end-to-end event flow for an update to an MCP server in Account B.


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