Building a secure auth code flow setup using AgentCore Gateway with MCP clients
Machine Learning Blog
This article explains how to implement OAuth 2.0 authorization code flow for secure authentication between AI coding assistants and MCP servers using Amazon Bedrock AgentCore Gateway.
- AgentCore Gateway acts as OAuth resource server validating tokens before proxying requests
- Authorization code flow requires user authentication through identity provider with PKCE support
- Gateway validates JWT tokens against IdP discovery endpoint with custom claim support
- Kiro IDE automatically triggers OAuth flow when receiving 401 authentication challenge
- MCP OAuth proxy (mcp-remote) standardizes client interface with Gateway endpoint
- Configuration requires OIDC app setup, Gateway JWT configuration, and client MCP settings
- Token validation checks signature, expiration, issuer, audience, and custom claims
This guide provides production-ready setup for identity-verified AI agent access to enterprise tools through secure OAuth authentication.
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