AWS Blocks Agent Runs on Strands SDK, Not AgentCore — But Migration PRs Signal Change

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Since entering public preview in June 2026, the AWS Blocks Agent has been built by composing existing Blocks — including Strands Agents SDK, AsyncJob, Realtime, FileBucket, and DistributedTable — rather than running on Amazon Bedrock AgentCore Runtime. This architecture maps to standard AWS services such as Lambda, SQS, API Gateway WebSocket, S3, and DynamoDB under the hood. A stack of five draft pull requests in the public GitHub repository proposes migrating the Agent Block's execution model to AgentCore Runtime, though as of August 12, 2026, none have been merged. A separate open pull request also proposes dedicated Blocks for AgentCore Memory, Gateway, and Identity. The proposals reflect the direction suggested by contributors and are not an official AWS roadmap.

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