AI Agent Identity at Scale Microsoft Entra Agent ID vs. AWS AgentCore Identity

A Deep Dive Comparison for Enterprise Architects & Developers Introduction AI agents are no longer a research curiosity. In 2025, organizations deploy fleets of autonomous agents that browse the web , call APIs , write code , and act on behalf of users sometimes with very little human supervision . With that power comes a critical question how do you manage who an agent is, what it can access, and how it authenticates to the tools it needs? Two cloud giants have answered that question with dedicated identity platforms built specifically for AI agents. Microsoft released Microsoft Entra Agent ID (currently in preview) , extending its mature enterprise identity suite to autonomous and assistive agents. AWS launched Amazon Bedrock AgentCore Identity as a GA service , enabling secure agent access across AWS resources and third-party tools like GitHub, Salesforce, and Slack. This blog explores both platforms in depth what they are, how they work, and how they compare so you can make an info