[BUG] Claude consistently suggests deprecated `commonLabels` in Kubernetes Kustomize configurations (Claude for Desktop, Claude Code)

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Claude consistently recommends using the deprecated commonLabels field in Kubernetes Kustomize configurations, despite this field being deprecated in favor of labels. This leads to deprecation warnings when users run kustomize build or apply their configurations.

The Kustomize documentation and tooling have moved away from commonLabels in favor of the more flexible labels field. Claude's training data may include older examples that use the deprecated syntax.

What Should Happen?

Claude should recommend using the labels field instead of commonLabels in Kustomization files, as this is the current standard practice.

Error Messages/Logs

### Example Output from Claude

Claude often provides configurations like:


apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization

commonLabels:  # This is deprecated
  app: my-app
  environment: production

resources:
  - deployment.yaml
  - service.yaml



apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization

labels:  # Use this instead
  - pairs:
      app: my-app
      environment: production

resources:
  - deployment.yaml
  - service.yaml


Kustomize output:

# Warning: 'commonLabels' is deprecated. Please use 'labels' instead. Run 'kustomize edit fix' to update your Kustomization automatically.

Steps to Reproduce

1. Ask Claude to create a Kustomize configuration for any given k8s resource
2. Observe that Claude suggests using commonLabels in the kustomization.yaml
3. Run kustomize build on the generated configuration
4. Notice the deprecation warning

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

1.0.123

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

Suggested Fix

Update Claude's knowledge base or prompt engineering to:

• Prioritize the labels field over commonLabels
• Add a note about the deprecation when commonLabels is mentioned
• Include examples using current Kustomize best practices