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.
git 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/commands/luongnv89/claude-howto/check-security)<a href="https://agentmods.dev/commands/luongnv89/claude-howto/check-security"><img src="https://agentmods.dev/badge/commands/luongnv89/claude-howto/check-security/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/commands/luongnv89/claude-howto/check-security"><img src="https://agentmods.dev/badge/commands/luongnv89/claude-howto/check-security.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00005 | $0.00160 |
| Opus 5.5 | $0.00002 | $0.00064 |
| Sonnet 5.5 | $0.00001 | $0.00032 |
| Haiku 4.5 | $0.00001 | $0.00016 |
Grade A, and why
check-security 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.
What it actually says
Security Check
Perform focused security analysis on code changes:
- Authentication/authorization checks
- Data exposure risks
- Injection vulnerabilities
- Cryptographic weaknesses
- Sensitive data in logs
Last Updated: October 15, 2026 Claude Code Version: 2.1.300 Sources:
- https://code.claude.com/docs/en/plugins
- https://code.claude.com/docs/en/skills#frontmatter-reference Compatible Models: Claude Fable 5, Claude Opus 5, Claude Sonnet 5, Claude Sonnet 4.6, Claude Opus 4.8, Claude Haiku 4.5
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.
- 5d ago Changed · -3 tokens per session 97f6c91079de
- 1mo ago First seen · 23 lines · 8 tokens per session scan A db10a5131eca
check-security is a command published in the GitHub repository luongnv89/claude-howto (42,095 stars, last pushed today), licensed MIT. It adds 5 tokens to every session and 160 once invoked, about $0.0000 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 commands, from other repositories
Review PR
A command that starts a full pull request review. A pull request is a proposed set of changes submitted for review before being merged into a codebase.
review
A code-review command that examines current changes for risks, regressions, missing tests, and readability.
refactor
Systematic code refactoring with smart scope detection.
review-branch
Review the current branch's diff against base by dispatching atomic-reviewer. No orchestration loop, no spec required — pre-flight before /commit pr or /commit merge.
init
Install the formatters this repository needs, with every command visible before it runs.
spec-trace-requirements
You are verifying that implementation changes trace back to specification requirements.