Implementing defense-in-depth authorization for MCP tools on Amazon Quick

This article demonstrates implementing a multi-gate authorization pattern for MCP tools on Amazon Quick using OIDC JWT claims and Microsoft Entra ID to enforce defense-in-depth access control.

• Four sequential authorization gates: MFA verification, country geo-fencing, group-based RBAC, and tool-level permissions
• AWS Lambda REQUEST interceptor evaluates JWT claims from Entra ID before tool invocation
• Configure Microsoft Entra ID resource and client applications with delegated scopes and token claims
• Create security groups mapped to reader, author, and admin policies for granular access control
• Enforce MFA through Conditional Access Policy before token issuance
• Connect Amazon Quick to Bedrock AgentCore Gateway with OAuth 2.0 and PKCE
• Immutable audit records capture actor identity, action, timestamp, and outcome for compliance
• Conditional gates can be disabled via environment variables for flexible deployment requirements

The pattern provides composable, defense-in-depth authorization for sensitive MCP tools without changing the end-user experience, scaling from basic RBAC to fully regulated workloads.