Claude Code Guide is a reference collection for configuring and using Claude Code, Anthropic’s command-line coding agent. Developers use it to learn commands, skills, agents, MCP, automation, security, integrations, and troubleshooting. Its catalogue add-ons provide many of the documented skills and agents.
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.
npx skills add zebbern/claude-code-guide --skill coregit clone --depth 1 https://github.com/zebbern/claude-code-guideWrote 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.
[](https://agentmods.dev/skills/zebbern/claude-code-guide/core)<a href="https://agentmods.dev/skills/zebbern/claude-code-guide/core"><img src="https://agentmods.dev/badge/skills/zebbern/claude-code-guide/core/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.
<a href="https://agentmods.dev/skills/zebbern/claude-code-guide/core"><img src="https://agentmods.dev/badge/skills/zebbern/claude-code-guide/core.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00062 | $0.01450 |
| Opus 5.5 | $0.00025 | $0.00580 |
| Sonnet 5.5 | $0.00012 | $0.00290 |
| Haiku 4.5 | $0.00006 | $0.00145 |
Grade A, and why
playwright-core 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 1mo 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- playwright-core — 89% identical, 122 lines differ
How it starts
The opening of the file, as written. The whole thing — 95 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Playwright Core Testing
Opinionated, production-tested Playwright guidance — every pattern includes when (and when not) to use it.
46 reference guides covering the full Playwright testing surface: selectors, assertions, fixtures, network mocking, auth, visual regression, accessibility, API testing, debugging, and more — with TypeScript and JavaScript examples throughout.
Golden Rules
getByRole()over CSS/XPath — resilient to markup changes, mirrors how users see the page- Never
page.waitForTimeout()— useexpect(locator).toBeVisible()orpage.waitForURL() - Web-first assertions —
expect(locator)auto-retries;expect(await locator.textContent())does not - Isolate every test — no shared state, no execution-order dependencies
baseURLin config — zero hardcoded URLs in tests- Retries:
2in CI,0locally — surface flakiness where it matters - Traces:
'on-first-retry'— rich debugging artifacts without CI slowdown - Fixtures over globals — share state via
test.extend(), not module-level variables - One behavior per test — multiple related
expect()calls are fine - Mock external services only — never mock your own app; mock third-party APIs, payment gateways, email
Guide Index
Writing Tests
| What you're doing | Guide | Deep dive |
|---|---|---|
| Choosing selectors | locators.md | locator-strategy.md |
| Assertions & waiting | assertions-and-waiting.md | |
| Organizing test suites | test-organization.md | test-architecture.md |
| Playwright config | configuration.md | |
| Fixtures & hooks | fixtures-and-hooks.md | |
| Test data | test-data-management.md | |
| Auth & login | authentication.md | auth-flows.md |
| API testing (REST/GraphQL) | api-testing.md | |
| Visual regression | visual-regression.md | |
| Accessibility | accessibility.md | |
| Mobile & responsive | mobile-and-responsive.md | |
| Component testing | component-testing.md | |
| Network mocking | network-mocking.md | when-to-mock.md |
| Forms & validation | forms-and-validation.md | |
| File uploads/downloads | file-operations.md | file-upload-download.md |
| Error & edge cases | error-and-edge-cases.md | |
| CRUD flows | crud-testing.md | |
| Drag and drop | drag-and-drop.md | |
| Search & filter UI | search-and-filter.md |
What ships with it
46 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- accessibility.md 53 KB
- angular.md 41 KB
- api-testing.md 51 KB
- assertions-and-waiting.md 27 KB
- auth-flows.md 32 KB
- authentication.md 49 KB
- browser-apis.md 24 KB
- browser-extensions.md 15 KB
- canvas-and-webgl.md 20 KB
- clock-and-time-mocking.md 19 KB
- common-pitfalls.md 44 KB
- component-testing.md 46 KB
- configuration.md 25 KB
- crud-testing.md 31 KB
- debugging.md 27 KB
- drag-and-drop.md 29 KB
- electron-testing.md 22 KB
- error-and-edge-cases.md 39 KB
- error-index.md 58 KB
- file-operations.md 26 KB
- file-upload-download.md 30 KB
- fixtures-and-hooks.md 33 KB
- flaky-tests.md 31 KB
- forms-and-validation.md 39 KB
- i18n-and-localization.md 24 KB
- iframes-and-shadow-dom.md 21 KB
- locator-strategy.md 20 KB
- locators.md 28 KB
- mobile-and-responsive.md 58 KB
- multi-context-and-popups.md 22 KB
- multi-user-and-collaboration.md 20 KB
- network-mocking.md 45 KB
- nextjs.md 36 KB
- performance-testing.md 23 KB
- react.md 39 KB
- search-and-filter.md 43 KB
- security-testing.md 25 KB
- service-workers-and-pwa.md 20 KB
- test-architecture.md 25 KB
- test-data-management.md 36 KB
- test-organization.md 31 KB
- third-party-integrations.md 30 KB
- visual-regression.md 35 KB
- vue.md 39 KB
- websockets-and-realtime.md 21 KB
- when-to-mock.md 28 KB
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.
- 1mo ago First seen · 95 lines · 62 tokens per session scan A 552bc243a63d
playwright-core is a skill published in the GitHub repository zebbern/claude-code-guide (4,665 stars, last pushed yesterday), licensed MIT. It adds 62 tokens to every session and 1,450 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-08-30.
Other skills, from other repositories
agent-e2e-test-specialist
Specialist subagent: Playwright, Cypress, and visual regression testing specialist. Use only when the user explicitly asks for E2E tests, browser test automation, or visual regression testing. Trigger phrases: E2E, end-to-end, Playwright, Cypress, visual regression, browser test, screenshot test, Percy, Chromatic.
qa-e2e
End-to-end tests with Playwright or Cypress. Trigger when the user wants to create user journey tests, UI integration tests, or browser automation.
qa-chrome
Visual tests and browser debugging via Chrome. Use to test web pages, verify visual rendering, debug with the console, or automate browser actions. Trigger when the user mentions "visual test", "Chrome", "browser", "browser console", "DOM", "screenshot", "GIF".
playwright-expert
Use when writing E2E tests with Playwright, setting up test infrastructure, or debugging flaky browser tests. Invoke for browser automation, E2E tests, Page Object Model, test flakiness, visual testing.
playwright-auth-state
Playwright workflows for authenticated browser state reuse through storageState and setup projects.
playwright-network-mocking
Playwright workflows for deterministic third-party responses using page.route().