New Workflow Submission: sfn-agentcore-bedrock-cdk

[NithinChandranR-AWS]

New Workflow: Step Functions with Bedrock AgentCore Multi-Agent Orchestration

Description

This workflow uses AWS Step Functions to orchestrate multiple Amazon Bedrock AgentCore agents in parallel via a Map state, then aggregates their responses into a unified summary using the Bedrock Converse API.

How it works:

1. A trigger Lambda starts the state machine with a prompt and list of AgentCore agent runtime ARNs
2. The Map state fans out to invoke each agent in parallel via a bundled Lambda intermediary
3. An aggregate Lambda uses Bedrock Converse to synthesize all agent responses into a unified summary

Key architectural decisions:

• The @aws-sdk/client-bedrock-agentcore SDK is not available in the Lambda runtime and must be bundled using NodejsFunction
• InvokeAgentRuntime returns a streaming response, requiring a Lambda intermediary rather than direct Step Functions SDK integration
• Map state enables parallel fan-out across any number of agents with configurable concurrency

Pattern Details

Field	Value
Language	TypeScript
Framework	CDK
Type	Standard
Level	400
Simplicity	3 - Application
Services	Step Functions, Lambda, Bedrock (AgentCore + Converse)

Files

• example-workflow.json — Pattern metadata
• statemachine/statemachine.asl.json — ASL definition
• resources/statemachine.png — Workflow diagram
• lib/sfn-agentcore-bedrock-stack.ts — CDK stack
• src/invoke-agent.ts — Lambda: invokes AgentCore agent (bundled SDK)
• src/aggregate.mjs — Lambda: aggregates responses via Bedrock Converse
• src/trigger.mjs — Lambda: triggers the state machine
• README.md — Full documentation with deploy/test/cleanup instructions

Testing

Deployed and tested on AWS account with multiple AgentCore agents. The pattern correctly:

• Fans out to N agents in parallel
• Collects streaming responses from each agent
• Aggregates into a coherent summary via Bedrock Converse

Checklist

• Pattern follows the model template
• example-workflow.json includes all required fields
• README.md sections completed in full
• State machine diagram exported as PNG
• Code tested and working

Author

Nithin Chandran R — Technical Account Manager at AWS
LinkedIn

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[NithinChandranR-AWS]

Related issue: #414

[NithinChandranR-AWS]

Hi 👋 Friendly nudge — this Step Functions + Bedrock AgentCore multi-agent orchestration workflow is ready for review. It's the first AgentCore pattern in this repo. Deployed and tested end-to-end. Would appreciate a review when you get a chance. Thank you!

[NithinChandranR-AWS]

Hi 👋 Friendly follow-up — this is the first AgentCore pattern in this repo. Shows Step Functions orchestrating multiple Bedrock AgentCore agents in parallel. Deployed and tested end-to-end. Would appreciate a review!