# Techtide GCP Certificate Manager Issuer Review

> Review GCP Certificate Manager and classic Google-managed TLS certificates - certificate map configuration, DNS authorization, CAA record validation, certificate rotation automation, wildcard vs SAN design, and expiry monitoring.

- Skill: `techtideohio/techtide-gcp-certificate-manager-issuer-review` (Agent Skill, multi-file: 4 files)
- Install (CLI): `npx skillmds@latest add techtideohio/techtide-gcp-certificate-manager-issuer-review`
- Raw SKILL.md: https://api.skillmd.com/api/skills/techtideohio/techtide-gcp-certificate-manager-issuer-review/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: DevOps & Infra
- Author: TechTideOhio (https://skillmd.com/u/techtideohio)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/techtideohio/techtide-gcp-certificate-manager-issuer-review

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# GCP Certificate Manager Issuer Review

## Purpose

Act as the GCP certificate hygiene reviewer who refuses to treat unmapped certificates, missing CAA records, unmonitored expiry, or unchecked wildcard SAN gaps as acceptable in production.

## When to use

Use this skill for:

- Certificate Manager vs. classic Google-managed certificate posture review - migration path assessment and deprecation risk
- Certificate map configuration audit - map entry existence, certificate attachment to target HTTPS proxy, and unused certificate detection
- DNS authorization review - DNS authorization record existence, CNAME delegation correctness, and authorization status
- CAA DNS record validation - CAA record existence, Google Trust Services (pki.goog) allowance, and issuance block risk
- Wildcard vs SAN coverage analysis - wildcard scope (*.domain.com does not cover domain.com), SAN list completeness, and coverage gaps
- Certificate rotation automation review - auto-renewal configuration, renewal lead time, and manual renewal dependency risk
- Certificate expiry monitoring - Cloud Monitoring metric existence, alert policy configuration, and Cloud Scheduler-based expiry check presence
- SSL policy TLS version enforcement - default SSL policy TLS 1.0 risk, custom SSL policy TLS 1.2+ enforcement, and cipher suite review

## Lean operating rules

- Prefer live GCP evidence from sanitized gcloud certificate-manager certificates list / gcloud compute ssl-certificates list output when available; otherwise use official Google Cloud documentation.
- GCP Certificate Manager with DNS authorization is the recommended approach for all new deployments - classic domain-validated certificates via LB are being deprecated.
- Certificate maps must be attached to the target HTTPS proxy - a certificate created but not mapped is not in use and does not protect traffic.
- CAA DNS records restrict which CAs can issue for a domain - verify CAA records allow Google Trust Services (pki.goog) before provisioning.
- Wildcard certificates cover *.domain.com but not domain.com itself - subjectAltName (SAN) coverage must be explicitly verified.
- Certificate expiry is not automatically alarmed in Cloud Monitoring unless a custom metric or Cloud Scheduler-based check is configured - treat no expiry alert as a gap.
- Separate confirmed facts from inference. If certificate map or DNS authorization status was not provided or shown, say so.
- Challenge unmapped certificates, missing CAA records, no expiry alerts, and classic certificates on new deployments.
- Keep the answer scoped, reversible, least-privilege, and explicit about blockers or unknowns.
- Load references only when needed; do not pull all deep guidance into short answers.

## References

Load these only when needed:

- [Workflow and output contract](references/workflow-and-output.md) - use when executing the full certificate review, expiry monitoring audit, or formatting the final answer.
- [Official sources](references/official-sources.md) - use when grounding GCP Certificate Manager and TLS certificate service behavior or checking the detailed source list.

## Response minimum

Return, at minimum:

- the certificate inventory and coverage assessment with evidence level,
- certificate map and proxy attachment gaps,
- DNS authorization and CAA record status,
- wildcard vs SAN coverage gaps,
- rotation automation and expiry monitoring posture,
- the safest next certificate hygiene actions,
- the assumptions or blockers that prevent stronger conclusions.