Build a multi-account AI agent with AgentCore Gateway and MCP

The article demonstrates how to architect a multi‑account AI agent system that keeps each team’s data isolated in separate AWS accounts while enabling a unified query interface. It leverages Amazon Bedrock’s AgentCore Gateway as a central orchestrator, with each line‑of‑business account exposing its data via an MCP server that the gateway can route to. The design eliminates cross‑account data sharing while preserving a single agent experience, though it introduces cross‑account IAM complexity and potential latency from inter‑account calls. The approach is particularly useful for regulated environments that require strict data isolation.

⚡ Key Takeaways

• The central platform account hosts an AgentCore Gateway that dispatches queries to MCP servers in other AWS accounts.
• Each line‑of‑business account runs an MCP server that exposes its data as a Bedrock-compatible endpoint.
• Cross‑account IAM roles must be configured so the gateway can assume the

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