GCP-HCP-Architecture

GCP-HCP-Architecture is a skill for Claude Code from openshift-online/gcp-hcp. It costs 126 tokens per session (3,666 once invoked), scanned A, original, Apache-2.0.

Architectural guidance for Google Cloud Hosted Control Planes, which run Kubernetes control planes on Google Kubernetes Engine.

In plain words
What is it for?
Use it when working on GCP HCP repositories, related infrastructure or tests, design decisions, architecture, or implementation plans.
Why use it?
It explains the design decisions and constraints behind GCP HCP code before you change or review it.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the gcp-hcp plugin — 4 skills, 2 commands, 2 agents shipped together

Good fit Use it when working on GCP HCP repositories, related infrastructure or tests, design decisions, architecture, or implementation plans.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/openshift-online/gcp-hcp/gcp-hcp-architecture
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add openshift-online/gcp-hcp --skill gcp-hcp-architecture
Clone the repo
git clone --depth 1 https://github.com/openshift-online/gcp-hcp

Made for: Claude Code.

Or install gcp-hcp, the plugin that ships this one along with the rest of its 4 skills, 2 commands, 2 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for GCP-HCP-Architecture

README.md
[![agentmods](https://agentmods.dev/badge/skills/openshift-online/gcp-hcp/gcp-hcp-architecture/github.svg)](https://agentmods.dev/skills/openshift-online/gcp-hcp/gcp-hcp-architecture)
Your own site
<a href="https://agentmods.dev/skills/openshift-online/gcp-hcp/gcp-hcp-architecture"><img src="https://agentmods.dev/badge/skills/openshift-online/gcp-hcp/gcp-hcp-architecture/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for GCP-HCP-Architecture

Your own site · 80×15
<a href="https://agentmods.dev/skills/openshift-online/gcp-hcp/gcp-hcp-architecture"><img src="https://agentmods.dev/badge/skills/openshift-online/gcp-hcp/gcp-hcp-architecture.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 126 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,666 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00126 $0.03666
Opus 5 $0.00063 $0.01833
Sonnet 5 $0.00025 $0.00733
Haiku 4.5 $0.00013 $0.00367

Measured 12d ago against content hash 4a05b7483f19, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

GCP-HCP-Architecture scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

claude-plugin/gcp-hcp/skills/gcp-hcp-architecture/SKILL.md · 85 lines

How it starts

The opening of the file, as written. The whole thing — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.

GCP HCP Architecture Context

Provides architectural context, design decisions, and implementation plans for GCP Hosted Control Planes (HCP) on GKE. Use this skill to understand constraints and rationale before writing or reviewing code.

Source repository: openshift-online/gcp-hcp

When to Use

Auto-invoke when:

  • Working on files in platform/gcp/, GCP provider code, or GCP-related tests in hypershift
  • Creating or modifying design decisions in design-decisions/
  • Reviewing PRs that touch GCP infrastructure or control plane components
  • Writing implementation plans for GCP HCP features

Manual invocation: /gcp-hcp-architecture [topic]

See design-decisions/INDEX.md for a browsable listing of all decision records.

Topic Index

Specify a topic to narrow results. Read the linked files from the gcp-hcp repository for full context.

Topic Design Decisions Architecture Implementation Plans
networking private-service-connect-networking, gcp-private-service-connect, gke-dataplane-v2-networking, no-direct-cross-cluster-connectivity, gke-ingress-controller, google-managed-certificates, gcp-api-gateway-frontend (superseded), espv2-api-frontend, customer-dns-zone-management, ci-externaldns-configuration, oidc-cdn-public-serving, datastore-transport, rc-mc-transport-layer (superseded) gcp-private-service-connect-implementation, gcp-customer-authentication
identity workload-identity-implementation, prow-ci-workload-identity-federation, iap-authentication, pam-workflow-gating, zero-operator-access, secret-management-strategy, gecko-api-aggregation, cedar-public-api-authorization gcp-wif-integration, gcp-cedar-public-api-authorization
observability observability-google-managed-prometheus, integrated-alerting-framework, data-lake-for-diagnostics-and-compliance
infrastructure gke-container-platform, gcp-folder-project-hierarchy, regional-independence-architecture, gke-fleet-management, shared-node-pools, hosted-cluster-upgrade-policy L1 Context, L2 Container
automation automation-first-philosophy, terraform-infrastructure-as-code, terraform-code-structure, terraform-automation-tooling, argocd-sync-wave-standardization, deployment-tooling-swim-lanes, pipeline-automation-tooling, cloud-workflows-automation-platform, cloud-workflows-common-tools-image, container-image-build-and-distribution, container-image-build-and-distribution-pipeline, ai-centric-sdlc, agent-autonomy-levels, gcp-agent-platform, go-controllers-runtime, e2e-terraform-config-approach-with-tfc gcp-320-automated-remediation-platform, ai-sdlc-pilot-update skill (biweekly GCP-579 pilot reporting)
governance naming-conventions, repository-organization-policy, gcphcpctl-graduation, adopt-cincinnati-for-version-resolution, platform-api, gecko-graduation adopt-cincinnati-for-version-resolution-selection-and-upgrades
storage gcp-pd-csi-operator-migration, gcp-persistent-disk-csi-driver
operators L3 Component/Hypershift gcp-321-image-registry-operator-integration
testing hypershift-repo-gcp-hcp-e2e-tests-implementation
incidents incidents/ — read all post-mortems for past failure patterns and lessons learned
slo slo/ — read all SLO definitions for performance and quality targets

Read the full file on GitHub · 85 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 12d ago First seen · 85 lines · 126 tokens per session scan A 4a05b7483f19

Subscribe to this mod's changes

GCP-HCP-Architecture is a skill published in the GitHub repository openshift-online/gcp-hcp (2 stars, last pushed 5d ago), licensed Apache-2.0. It adds 126 tokens to every session and 3,666 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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