# Adaptive Enforcement Lab Claude Skills Jmespath For Kyverno

> JMESPath for Kyverno

- Skill: `tomevault-io/adaptive-enforcement-lab-claude-skills-jmespath-for-kyverno` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/adaptive-enforcement-lab-claude-skills-jmespath-for-kyverno`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/adaptive-enforcement-lab-claude-skills-jmespath-for-kyverno/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: tomevault-io (https://skillmd.com/u/tomevault-io)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tomevault-io/adaptive-enforcement-lab-claude-skills-jmespath-for-kyverno

---


# JMESPath for Kyverno

## When to Use This Skill

**Use JMESPath when:**

- Pattern matching can't express your logic
- You need conditionals or transformations
- Validation depends on multiple fields
- You're filtering or comparing arrays

**Skip JMESPath when:**

- Simple pattern matching works (`pattern`, `anyPattern`)
- You're only checking field existence
- No cross-field validation needed

> **Test Before Deploying**
>
> Always test JMESPath expressions with `kyverno jp` before adding them to policies. Syntax errors fail silently in audit mode and block resources in enforce mode.
>

---


## Implementation

**Install Kyverno CLI for testing:**

```bash
# Install kyverno CLI
brew install kyverno/kyverno/kyverno

# Test JMESPath expression
kyverno jp query -i manifest.yaml 'spec.template.spec.containers[*].name'
```

**Simple validation example:**


*See [examples.md](examples.md) for detailed code examples.*

**What this does:**

- Filters containers without memory limits: `containers[?!resources.limits.memory]`
- Extracts their names: `.name`
- Counts them: `| length(@)`
- Denies if count > 0

---


## Examples

See [examples.md](examples.md) for code examples.
## References

- [Source Documentation](https://adaptive-enforcement-lab.com/enforce/policy-as-code/)
- [AEL Enforce](https://adaptive-enforcement-lab.com/enforce/)

---
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<!-- tomevault:4.0:skill_md:2026-04-15 -->