Feat/gateway okta auth code flow tutorial

[dsuarezsoutoaws]

Amazon Bedrock AgentCore Samples Pull Request

Issue number: #1286

Concise description of the PR

Adds tutorial 17-inbound-auth-code-flow-okta to 01-tutorials/02-AgentCore-gateway/,
because there is no existing tutorial covering inbound CUSTOM_JWT authentication on
AgentCore Gateway using an external identity provider like Okta.

User experience

Before: No guide for setting up OAuth 2.0 Authorization Code Flow with PKCE on AgentCore Gateway with an external IdP. Users had to piece together Okta docs, Gateway API docs, and mcp-remote configuration on their own.

After: A self-contained Jupyter notebook walks users through the full flow end-to-end — creating an Okta SPA app, creating a Gateway with CUSTOM_JWT auth, verifying the 401 challenge, installing mcp-remote, and configuring Kiro IDE's mcp.json. Includes 9 annotated screenshots.

Checklist

If your change doesn't seem to apply, please leave them unchecked.

• I have reviewed the contributing guidelines
• Add your name to CONTRIBUTORS.md
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Are you uploading a dataset?
• Have you documented Introduction, Architecture Diagram, Prerequisites, Usage, Sample Prompts, and Clean Up steps in your example README?
• I agree to resolve any issues created for this example in the future.
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented

Acknowledgment

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of the project license.

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