Waf
TheDecipherist/claude-code-mastery-project-starter-kit
Web Application Firewall guidance, when to put one in front of an app and how to run it without breaking traffic.
Entry P1 category router for injection testing. An agent skill from yaklang/hack-skills.
Install Injection Checking
$ npx skills add yaklang/hack-skills --skill injection-checking -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install yaklang/hack-skills injection-checking --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/yaklang/hack-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/injection-checking .claude/skills/injection-checking && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "injection-checking" agent skill from https://github.com/yaklang/hack-skills/tree/main/skills/injection-checking into .claude/skills/injection-checking/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "injection-checking", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/yaklang/hack-skills/tree/main/skills/injection-checkingType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add yaklang/hack-skills --skill injection-checking -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install yaklang/hack-skills injection-checking --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/yaklang/hack-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/injection-checking .agents/skills/injection-checking && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "injection-checking" agent skill from https://github.com/yaklang/hack-skills/tree/main/skills/injection-checking into .agents/skills/injection-checking/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "injection-checking", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add yaklang/hack-skills --skill injection-checking -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install yaklang/hack-skills injection-checking --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/yaklang/hack-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/injection-checking .cursor/skills/injection-checking && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "injection-checking" agent skill from https://github.com/yaklang/hack-skills/tree/main/skills/injection-checking into .cursor/skills/injection-checking/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "injection-checking", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/yaklang/hack-skills.git --path skills/injection-checking--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add yaklang/hack-skills --skill injection-checking -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install yaklang/hack-skills injection-checking --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/yaklang/hack-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/injection-checking .gemini/skills/injection-checking && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "injection-checking" agent skill from https://github.com/yaklang/hack-skills/tree/main/skills/injection-checking into .gemini/skills/injection-checking/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "injection-checking", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install yaklang/hack-skills injection-checkingInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add yaklang/hack-skills --skill injection-checking -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/yaklang/hack-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/injection-checking .github/skills/injection-checking && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "injection-checking" agent skill from https://github.com/yaklang/hack-skills/tree/main/skills/injection-checking into .github/skills/injection-checking/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "injection-checking", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add yaklang/hack-skills --skill injection-checking -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install yaklang/hack-skills injection-checking --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/yaklang/hack-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/injection-checking .opencode/skills/injection-checking && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "injection-checking" agent skill from https://github.com/yaklang/hack-skills/tree/main/skills/injection-checking into .opencode/skills/injection-checking/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "injection-checking", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
injection-checking- GitHub stars
- 2.4k
- Token cost
- ~570 tokens
- SKILL.md length
- 190 words
- Files
- 2
- Skills in repo
- 26
- Repo updated
- First seen
- Licence
- MIT
At a glance
Entry P1 category router for injection testing. An agent skill from yaklang/hack-skills.
- Works in 3 steps: First identify the final sink of the input → Then choose the topic skill that best… → Small payload samples and quick triage…
- Routing between XSS
- SKILL.md covers When to Use, Skill Map, Recommended Flow and Related Categories
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Injection Checking is an agent skill from yaklang/hack-skills. Entry P1 category router for injection testing. Use when routing between XSS, SQLi, SSRF, XXE, SSTI, command injection, and NoSQL injection workflows based on how attacker-controlled input is consumed.
Its SKILL.md is about 570 tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `EXTRA_INJECTION_TYPES.md`).
It sits in Security, covering Web application vulnerabilities and NoSQL databases. The repository describes itself as: Helping AI Agent become an awesome practical hacker! The licence is MIT.
When your agent uses it
- Routing between XSS
- Command injection
- NoSQL injection workflows based on how attacker-controlled input is consumed
Example prompts
- “/injection-checking”
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- First identify the final sink of the input
- Then choose the topic skill that best matches that interpreter
- Small payload samples and quick triage are merged into each main skill; no extra payload router is needed
What it can do on your machine
Read from SKILL.md and the folder at commit 6fbf0bc. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Injection Checking loads about 570 tokens when it runs. Until then it costs about 55 tokens; SKILL.md has 190 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from yaklang/hack-skills at commit 6fbf0bc, republished under its MIT licence (© yaklang). 190 words, ~570 tokens.
Download SKILL.mdSave it as
.claude/skills/injection-checking/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- injection-checking
- description
- Entry P1 category router for injection testing. Use when routing between XSS, SQLi, SSRF, XXE, SSTI, command injection, and NoSQL injection workflows based on how attacker-controlled input is consumed.
Injection Testing Router
This is the routing entry point when input reaches a dangerous interpreter or execution environment.
After confirming this is an injection-class issue, use it to decide whether it is mainly browser context, database, template engine, server-side requests, XML parsing, or system commands.
When to Use
- Input reaches HTML, JS, SQL, templates, URL fetchers, XML parsers, or shell
- You have not yet decided whether to start with XSS, SQLi, SSRF, XXE, SSTI, CMDi, or NoSQL
- You need to choose the correct deep-topic skill based on input flow
Skill Map
- XSS Cross Site Scripting
- SQLi SQL Injection
- SSRF Server Side Request Forgery
- XXE XML External Entity
- SSTI Server Side Template Injection
- CMDi Command Injection
- NoSQL Injection
- Deserialization Insecure
- JNDI Injection
- Expression Language Injection
- CRLF Injection
- Extra Injection Types (SSI, LDAP, XPath)
- Request Smuggling
- Prototype Pollution
- Type Juggling
- HTTP Parameter Pollution
- XSLT Injection
- CSV Formula Injection
Recommended Flow
- First identify the final sink of the input
- Then choose the topic skill that best matches that interpreter
- Small payload samples and quick triage are merged into each main skill; no extra payload router is needed
Related Categories
© yaklang, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 1 other file in skills/injection-checking of yaklang/hack-skills.
- SKILL.md
- EXTRA_INJECTION_TYPES.md
Open the folder on GitHubat commit 6fbf0bc
Compare with similar skills
Injection Checking next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Injection Checking this skillyaklang/hack-skills | 2.4k | — | ~570 | Automated safety check: Pass | MIT | |
| WafTheDecipherist/claude-code-mastery-project-starter-kit | 338 | — | ~1.4k | Automated safety check: Pass | MIT | |
| Java Injection Auditwgpsec/AboutSecurity | 1.8k | — | ~1.1k | Automated safety check: Pass | None | |
| Php Injection Auditwgpsec/AboutSecurity | 1.8k | — | ~965 | Automated safety check: Pass | None | |
| Security And Hardeningpenpot/penpot | 61k | 6 repos | ~4.7k | Automated safety check: Notes | MPL-2.0 | |
| Security Auditoreigent-ai/eigent | 15k | — | ~1.8k | Automated safety check: Notes | Apache-2.0 |
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Categories
Questions about Injection Checking
What does Injection Checking do?
Entry P1 category router for injection testing. An agent skill from yaklang/hack-skills. Injection Checking is an agent skill from yaklang/hack-skills. Entry P1 category router for injection testing.
When should I use Injection Checking?
Injection Checking fits situations like: routing between XSS; command injection; noSQL injection workflows based on how attacker-controlled input is consumed.
How do I install Injection Checking in Claude Code?
Run `npx skills add yaklang/hack-skills --skill injection-checking -a claude-code`. Or copy the skill folder (skills/injection-checking in yaklang/hack-skills) into .claude/skills/injection-checking in your project. Claude Code loads it when a task matches its description.
How do I install Injection Checking in Codex?
Run `npx skills add yaklang/hack-skills --skill injection-checking -a codex`. Or copy the skill folder (skills/injection-checking in yaklang/hack-skills) into .agents/skills/injection-checking in your project. Codex loads it when a task matches its description.
Can I use Injection Checking in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add yaklang/hack-skills --skill injection-checking -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/injection-checking, .gemini/skills/injection-checking, .github/skills/injection-checking and .opencode/skills/injection-checking in your project.
What does Injection Checking need to run?
SKILL.md names no scripts, command-line tools or credentials: Injection Checking is instructions for the agent only.
Does Injection Checking access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Injection Checking safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Injection Checking use?
Injection Checking is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Injection Checking use?
About 570 tokens (SKILL.md is roughly 2.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Injection Checking?
Skills that share tags, products or a category with Injection Checking: Waf (TheDecipherist/claude-code-mastery-project-starter-kit, 338 stars), Java Injection Audit (wgpsec/AboutSecurity, 1.8k stars), Php Injection Audit (wgpsec/AboutSecurity, 1.8k stars) and Security And Hardening (penpot/penpot, 61k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Injection Checking?
yaklang (a GitHub organization) maintains it in yaklang/hack-skills, which has 2,394 GitHub stars. The repository holds 26 skills in this directory. The repository was last updated on September 13, 2026.
Source: yaklang/hack-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.