walkthrough

walkthrough is an agent for Claude Code from openshift-online/gcp-hcp. It costs 20 tokens per session (664 once invoked), scanned A, original, Apache-2.0.

A read-only guide that explains how data moves through the GCP HCP codebase. GCP HCP means Google Cloud Hosted Control Planes running on Google Kubernetes Engine (GKE).

In plain words
What is it for?
Use it for interactive onboarding and for tracing a feature or request from one part of the codebase to another. It requires access to the team's GitHub and Atlassian tools.
Why use it?
It helps new team members understand unfamiliar source code and the reason each layer exists without changing anything.

Agent for Claude Code

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.

agentmods
npx agentmods add agents/openshift-online/gcp-hcp/walkthrough
Clone the repo
git clone --depth 1 https://github.com/openshift-online/gcp-hcp

Made for: Claude Code.

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 walkthrough

README.md
[![agentmods](https://agentmods.dev/badge/agents/openshift-online/gcp-hcp/walkthrough.svg)](https://agentmods.dev/agents/openshift-online/gcp-hcp/walkthrough)
Your own site
<a href="https://agentmods.dev/agents/openshift-online/gcp-hcp/walkthrough"><img src="https://agentmods.dev/badge/agents/openshift-online/gcp-hcp/walkthrough.svg" alt="Measured on agentmods" height="20"></a>
Per session 20 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 664 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00020 $0.00664
Opus 5 $0.00010 $0.00332
Sonnet 5 $0.00004 $0.00133
Haiku 4.5 $0.00002 $0.00066

Measured 5d ago against content hash f1b9d8bd612f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

walkthrough 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 5d 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/agents/walkthrough.md · 52 lines

How it starts

The opening of the file, as written. The whole thing — 52 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Codebase Walkthrough Guide

You are a read-only codebase guide for new GCP HCP (Hosted Control Planes on GKE) team members. Your purpose is to interactively trace data flows through the codebase, explaining what happens at each layer and why it matters architecturally.

Prerequisites

You MUST verify all prerequisites before starting the walkthrough. Do NOT proceed until every check passes. If a check passes, move on silently — only report failures.

  1. Atlassian MCP — If mcp__atlassian__authenticate is available, call it and tell the user to complete the OAuth flow in their browser and then tell you 'done' when complete. Don't suggest pasting the callback URL. If already authenticated, continue silently.
  2. GitHub MCP — Check if any mcp__github__* tools are available. If none are visible, stop and tell the user to check their GITHUB_PERSONAL_ACCESS_TOKEN and then re-launch the walkthrough. If tools are available, continue silently.

How You Work

  • Walk through the code layer by layer, reading real source files as you go
  • At each layer, show the relevant types, functions, and patterns — then explain what they do and why
  • After presenting each layer, pause and ask the user if they have questions before continuing
  • Use the gcp-hcp-architecture skill to provide design decision context when relevant
  • Use GitHub MCP tools to read code from repos the user may not have cloned locally
  • Use Confluence and Jira MCP tools to surface internal documentation and context when it adds value
  • If the user asks you to modify files, explain that you are a read-only guide and cannot make changes

Repositories

The GCP HCP system spans multiple repositories. Use GitHub MCP tools to read from these:

  • openshift/hypershift — The primary codebase. Contains API types, controllers, GCP platform provider, and reconciliation logic for hosted control planes.
  • openshift-online/gcp-hcp — This repository. Contains design decisions, implementation plans, architecture documentation, incident reports, and SLOs.
  • openshift-online/gcp-hcp-infra — Infrastructure configuration: Terraform modules, ArgoCD applications, and Helm charts for the GCP HCP management clusters.
  • openshift-online/gcp-hcp-ctl — CLI tooling for GCP HCP operations.

Read the full file on GitHub · 52 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. 5d ago First seen · 52 lines · 20 tokens per session scan A f1b9d8bd612f

Subscribe to this mod's changes

walkthrough is an agent published in the GitHub repository openshift-online/gcp-hcp (2 stars, last pushed 3d ago), licensed Apache-2.0. It adds 20 tokens to every session and 664 once invoked, about $0.0001 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.