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AWS Security Blog · August 18, 2026

Implement custom authentication for tools integration using request Lambda interceptor in AgentCore Gateway

guide Agent SecurityAI EngineeringPrompt Injection
Why it matters

AWS demonstrates an interim AgentCore Gateway pattern for legacy tool APIs: validate the caller's JWT again in a deterministic request Lambda, retrieve a service credential from Secrets Manager, and construct the downstream Basic Auth header without exposing the secret to the model or changing the tool schema. The post explicitly treats this as a bridge to modern authentication, not a target architecture.

My takeaway: Keep credential translation outside the agent runtime. Scope the interceptor role to one secret and KMS key, require TLS, rotate the service account immediately after seeding, cache only briefly, audit code changes, and detect credential drift. Plan the migration to OAuth, SAML, OpenID Connect, or IAM so a shared Basic Auth identity does not become permanent agent infrastructure.
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