Asynchronous patterns for calling Amazon Bedrock AgentCore agents in serverless pipelines
aws ·
The article discusses asynchronous invocation patterns for Amazon Bedrock AgentCore agents in serverless pipelines to avoid idle compute costs. It highlights that while the agent runtime only charges for memory during idle processing, a synchronous caller like a Lambda function blocks and pays for full compute while waiting. The authors present an example document-validation pipeline for real-estate financing to compare four approaches. The blocking anti-pattern holds the Lambda open for the entire agent runtime, billing for the wait. Pattern 1 uses a Step Functions task-token callback with a dispatcher Lambda that starts the agent and returns quickly, while the paused execution waits without cost. Pattern 2 removes Lambda entirely by integrating Step Functions directly with AgentCore via AWS SDK. Pattern 3 uses a Lambda durable function that suspends during the agent callback and resumes afterward. All three patterns eliminate idle compute billing, with trade-offs in custom logic, orchestration style, and architecture complexity.
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