TL;DR: AI coding assistants are diverging between editor-bound helpers and more agentic systems that plan across codebases, and a Descope comparison found Gemini Code Assist produced a partially correct JWT flow while Claude Code delivered a more complete implementation with stronger tests. The security lesson is that code generation still depends on human review, because authentication logic can look correct while leaking hashes, skipping migrations, or weakening token boundaries.
Editorial analysis by NHI Mgmt Group, based on content published by Descope: “Developer's Guide to Claude Code vs. Gemini Code Assist”.
By the numbers:
- Claude Code had over 10.1 million VS Code installs as of April 2026, compared with Gemini Code Assist's 3.7 million.
Key questions
Q: What should teams do first when AI-generated auth code reaches review?
A: Start by reviewing every identity boundary the assistant touched, including token issuance, refresh handling, response payloads, and database schema changes.
Q: Why do AI coding assistants create risk in authentication workflows?
A: They can generate code that appears complete while still missing migrations, exposing sensitive fields, or weakening token separation.
Q: What are the signs that AI-generated automation code is not ready for production use?
A: The clearest warning signs are code that does not match the expected input schema, transformation logic that behaves differently from the analyst’s intent, and playbooks that have not been pre-tested in the user interface.
Practitioner guidance
- Set stricter review gates for AI-authored auth changes Require manual approval for any generated change that touches login, token issuance, refresh logic, profile payloads, or user schemas.
- Add negative-path tests for token boundaries Verify that refresh tokens cannot be used where access tokens are expected, that access tokens are rejected at refresh endpoints, and that malformed or missing credentials fail closed.
- Audit response payloads for sensitive fields Check every identity-related API response for hashed passwords, internal identifiers, and other fields that should remain server-side only, especially after assistant-generated refactors.
Bottom line: AI coding assistants can produce functional authentication code while still leaving review gaps that expose sensitive fields or weaken token boundaries.
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AI coding assistants create an auth review gap, not an auth replacement. The core issue in this comparison is that generated authentication code can be syntactically sound and still be operationally unsafe. When assistants write login, refresh, and profile logic, the human reviewer becomes the control that preserves token scope, schema integrity, and field suppression. The practitioner conclusion is straightforward: code generation does not remove the need for identity review, it increases the number of places review must happen.
A few things that frame the scale:
- Claude Code-assisted commits leaked secrets at a rate of 3.2%, more than double the human-only baseline of 1.5%, with peaks reaching 31 secrets per 1,000 commits in August 2025, according to the State of Secrets Sprawl 2026.
- Only 44% of developers are reported to follow security best practices for secrets management, exposing a significant developer behaviour gap, according to the State of Secrets in AppSec.
A question worth separating out:
Q: Should IAM teams treat code assistants differently for auth than for other features?
A: Yes. Authentication changes deserve stricter review because they affect token boundaries, account data exposure, and session integrity. In practice, AI assistance should speed implementation, but the approval threshold should be higher whenever the diff changes identity behaviour.
👉 Read our full editorial: AI coding assistants are exposing auth and review gaps in IDEs