luongnv89/claude-howto is a visual, example-based guide to Claude Code, a coding tool that supports agents, hooks, skills, slash commands, and MCP servers. Developers use it to learn Claude Code through practical workflows and copyable templates, including the commands, agents, skills, plugins, and instructions catalogued here.
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 luongnv89/claude-howto --skill lesson-quizgit clone --depth 1 https://github.com/luongnv89/claude-howtoWrote 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/luongnv89/claude-howto/lesson-quiz)<a href="https://agentmods.dev/skills/luongnv89/claude-howto/lesson-quiz"><img src="https://agentmods.dev/badge/skills/luongnv89/claude-howto/lesson-quiz/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/luongnv89/claude-howto/lesson-quiz"><img src="https://agentmods.dev/badge/skills/luongnv89/claude-howto/lesson-quiz.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 | $0.00058 | $0.02235 |
| Opus 5 | $0.00029 | $0.01118 |
| Sonnet 5 | $0.00012 | $0.00447 |
| Haiku 4.5 | $0.00006 | $0.00224 |
Grade A, and why
lesson-quiz 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 7d 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.
How it starts
The opening of the file, as written. The whole thing — 198 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Lesson Quiz
Interactive quiz that tests understanding of a specific Claude Code lesson with 8-10 questions, provides per-question feedback, and identifies areas to review.
Prerequisites
This skill requires:
- The tutorial repo checked out, so the lesson directories
01-slash-commands/…10-cli/and eachREADME.mdare readable. references/question-bank.mdpresent in this skill (the source of all questions).
Before starting, confirm the target lesson's README.md exists. If it is missing, do not fabricate questions — warn the user and ask them to check the repository structure (see Error Handling).
Guardrails:
- Never invent questions or answers. Ask only questions drawn from
references/question-bank.mdfor the selected lesson; if the bank lacks entries for a lesson, say so rather than making them up. - Score accurately. Track which shuffled position holds the correct answer for every question and validate each response against it — never guess a score.
- Confirm timing before scoring. The pre/during/after choice changes how results are framed; do not skip it.
Instructions
Step 1: Determine the Lesson
If the user provided a lesson as an argument (e.g., /lesson-quiz hooks or /lesson-quiz 03), map it to the lesson directory:
Lesson mapping:
01,slash-commands,commands→ 01-slash-commands02,memory→ 02-memory03,skills→ 03-skills04,subagents,agents→ 04-subagents05,mcp→ 05-mcp06,hooks→ 06-hooks07,plugins→ 07-plugins08,checkpoints,checkpoint→ 08-checkpoints09,advanced,advanced-features→ 09-advanced-features10,cli→ 10-cli
If no argument was provided, present a selection prompt using AskUserQuestion:
Question 1 (header: "Lesson"): "Which lesson do you want to quiz on?" Options:
- "Slash Commands (01)" — Custom commands, skills, frontmatter, arguments
- "Memory (02)" — CLAUDE.md, memory hierarchy, rules, auto memory
- "Skills (03)" — Progressive disclosure, auto-invocation, SKILL.md
- "Subagents (04)" — Task delegation, agent config, isolation
What ships with it
3 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.
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.
- 7d ago Changed faa945958ad5
- 13d ago First seen · 198 lines · 58 tokens per session scan A a707aef6e7a3
lesson-quiz is a skill published in the GitHub repository luongnv89/claude-howto (41,443 stars, last pushed 6d ago), licensed MIT. It adds 58 tokens to every session and 2,235 once invoked, about $0.0003 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 2026-08-30.
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