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Fluxcd kustomization helmrelease review

Skill Raishin/vanguard-frontier-agentic/skills/fluxcd/fluxcd-kustomization-helmrelease-review

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Install
npx -y skills add Raishin/vanguard-frontier-agentic --skill fluxcd-kustomization-helmrelease-review

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  • 18 stars18 stars. Stars are a popularity signal and not a quality one, but at this level it is likely that nobody has read this closely except its author, and you would be relying on your own review.

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Use this skill when reviewing FluxCD Kustomization, HelmRelease, GitRepository, HelmRepository, or OCIRepository resources. Trigger when the user asks whether a Flux configuration is safe for production, whether SOPS encryption is required, whether prune is safe on a given workload, whether commit signature verification is enabled, or whether a Flux multi-tenant setup uses least-privilege ServiceAccounts.

SKILL.md

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FluxCD Kustomization and HelmRelease Review

Purpose

Review FluxCD Kustomization, HelmRelease, GitRepository, HelmRepository, and OCIRepository resources for source trust guarantees, SOPS secret encryption, prune-enabled blast radius on stateful workloads, per-Kustomization ServiceAccount scoping, HelmRelease upgrade remediation safety, and health check completeness. FluxCD's default posture gives the kustomize-controller cluster-admin-equivalent reach — the security surface lives in per-Kustomization ServiceAccounts, commit signature verification, SOPS encryption at rest, and prune annotation guards.

Lean operating rules

  • Prefer user-provided sanitized resource YAML as primary evidence; official FluxCD docs are the authoritative fallback.
  • Treat unencrypted Kubernetes Secret manifests committed to any Git source as a CRITICAL finding — anyone with repo read access (CI, PR participants, auditors) has those secrets.
  • Treat GitRepository.spec.ref.semver: ">=0.0.0" or an unbound semver range in a production source as a HIGH finding — any tag push from a compromised upstream triggers a deploy.
  • Treat the absence of spec.verify.secretRef (commit GPG signature verification) on production GitRepository sources as a HIGH finding.
  • Treat Kustomization.spec.serviceAccountName not set as a HIGH finding — the kustomize-controller SA applies with cluster-admin-equivalent scope for all tenants.
  • Treat spec.prune: true on Kustomizations covering stateful workloads (StatefulSets, PVCs, CRDs) without kustomize.toolkit.fluxcd.io/prune: disabled annotations as a HIGH finding.
  • Treat HelmRelease.spec.chart.spec.version: "*" or an unbound version range as a HIGH finding — any upstream chart publish triggers an auto-upgrade.
  • Treat HelmRelease.spec.upgrade.remediation.retries: -1 (infinite retry) as a MEDIUM finding — a broken release blocks other reconciliation loops indefinitely.
  • Keep the answer scoped: report what was reviewed, the evidence level, and the exact field path for each finding.

References

Load these only when needed:

Response minimum

  • Scoped target (resource kind/name/namespace) and evidence level
  • Source trust verdict (commit verification, semver pinning, SOPS encryption)
  • Kustomization ServiceAccount scope assessment
  • Prune safety verdict for any stateful workloads
  • HelmRelease version pinning and upgrade remediation assessment
  • Health check completeness verdict
  • Safe next actions and open questions

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