AWS launches Agent Registry push synchronization solution
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AWS has published a tutorial introducing an event-driven push-based architecture for automatically synchronizing records in the AWS Agent Registry when an MCP server is updated. The architecture uses AWS CloudTrail, Amazon EventBridge, and AWS Lambda to achieve automatic updates. According to AWS, after Lambda updates a record with a new tool definition, the record automatically reverts to Draft status; a curator or administrator must then approve it before the new metadata becomes discoverable.
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- AWS Machine Learning BlogAutomating AWS Agent Registry updates with push-based architecture
This post describes an event-driven pipeline using AWS CloudTrail, Amazon EventBridge, and AWS Lambda that detects Amazon Bedrock AgentCore UpdateAgentRuntime events and syncs MCP server tool schemas into AWS Agent Registry records, supporting both single- and multi-account setups. The Lambda extracts the runtime ARN, obtains an OAuth bearer token via AgentCore Identity, calls the MCP server's initialize and tools/list methods, then updates the matching APPROVED registry record only when normalized tool definitions differ. Updated records revert to Draft status and require curator approval before becoming discoverable, and the post notes limitations such as no automatic registration of new servers and no retry on cold starts.
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