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

DevFeed: [Implement custom authentication for tools integration using request Lambda interceptor in AgentCore Gateway](<https://devfeed.tech/articles/implement-custom-authentication-for-tools-integration-using-request-lambda-interceptor-in-agentcore-gateway-4684.md>)

Original publisher: [Read original article](<https://aws.amazon.com/blogs/security/implement-custom-authentication-for-tools-integration-using-request-lambda-interceptor-in-agentcore-gateway/>)

Author: Nishant Mainro

Published: 2026-08-18T20:46:26Z

Content type: tutorial

Language: en

Sources: [AWS Security Blog](<https://devfeed.tech/sources/aws-security-blog.md>)

Topics: [Amazon Bedrock AgentCore](<https://devfeed.tech/topics/amazon-bedrock-agentcore.md>), [Amazon Bedrock](<https://devfeed.tech/topics/amazon-bedrock.md>), [AI Agent](<https://devfeed.tech/topics/ai-agent.md>), [Security](<https://devfeed.tech/topics/security.md>), [IAM](<https://devfeed.tech/topics/iam.md>), [Model Context Protocol](<https://devfeed.tech/topics/model-context-protocol.md>), [OAuth 2.0](<https://devfeed.tech/topics/oauth2.md>), [Architecture & Design](<https://devfeed.tech/topics/architecture-design.md>), [JSON Web Tokens](<https://devfeed.tech/topics/jwt.md>)

Tags: [advanced-300](<https://devfeed.tech/tags/advanced-300.md>), [ai-agents](<https://devfeed.tech/tags/ai-agents.md>), [amazon-bedrock](<https://devfeed.tech/tags/amazon-bedrock.md>), [amazon-bedrock-agentcore](<https://devfeed.tech/tags/amazon-bedrock-agentcore.md>), [artificial-intelligence](<https://devfeed.tech/tags/artificial-intelligence.md>), [aws-identity-and-access-management-iam](<https://devfeed.tech/tags/aws-identity-and-access-management-iam.md>), [aws-lambda](<https://devfeed.tech/tags/aws-lambda.md>), [model-context-protocol](<https://devfeed.tech/tags/model-context-protocol.md>), [oauth](<https://devfeed.tech/tags/oauth.md>), [prompt-injection](<https://devfeed.tech/tags/prompt-injection.md>), [secrets](<https://devfeed.tech/tags/secrets.md>), [security](<https://devfeed.tech/tags/security.md>), [security-blog](<https://devfeed.tech/tags/security-blog.md>), [security-identity-compliance](<https://devfeed.tech/tags/security-identity-compliance.md>), [technical-how-to](<https://devfeed.tech/tags/technical-how-to.md>)

## AI overview

This tutorial explains how to use a request Lambda interceptor in Amazon Bedrock AgentCore Gateway to support legacy Basic Authentication for downstream tool APIs. The interceptor retrieves service credentials from AWS Secrets Manager and constructs the authentication header while keeping credentials isolated from the AI agent. The article also describes the inbound MCP request flow and cautions that Basic Auth should be treated as an interim measure, with modernization toward OAuth 2.0, SAML, OpenID Connect, or IAM recommended.

## Source excerpt

When deploying AI agents with Amazon Bedrock AgentCore, organizations benefit from built-in modern support for OAuth 2.0, AWS Identity and Access Management (IAM), and API key authentication through Amazon Bedrock AgentCore Gateway. However, some enterprise environments still use legacy authentication mechanisms such as HTTP Basic Authentication (Basic Auth) (RFC 7617). The extensible architecture of AgentCore [...]