YugabyteDB ASH Instrumentation
yugabyte/yugabyte-db
Procedure for adding or changing YugabyteDB Active Session History wait states in TServer and DocDB C++ code, including the macro to use for sync and async paths.
Entry P1 category router for business logic testing. An agent skill from yaklang/hack-skills.
Install Business Logic Vuln
$ npx skills add yaklang/hack-skills --skill business-logic-vuln -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install yaklang/hack-skills business-logic-vuln --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/business-logic-vuln .claude/skills/business-logic-vuln && 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 "business-logic-vuln" agent skill from https://github.com/yaklang/hack-skills/tree/main/skills/business-logic-vuln into .claude/skills/business-logic-vuln/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "business-logic-vuln", 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/business-logic-vulnType 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 business-logic-vuln -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install yaklang/hack-skills business-logic-vuln --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/business-logic-vuln .agents/skills/business-logic-vuln && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "business-logic-vuln" agent skill from https://github.com/yaklang/hack-skills/tree/main/skills/business-logic-vuln into .agents/skills/business-logic-vuln/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "business-logic-vuln", 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 business-logic-vuln -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install yaklang/hack-skills business-logic-vuln --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/business-logic-vuln .cursor/skills/business-logic-vuln && 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 "business-logic-vuln" agent skill from https://github.com/yaklang/hack-skills/tree/main/skills/business-logic-vuln into .cursor/skills/business-logic-vuln/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "business-logic-vuln", 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/business-logic-vuln--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 business-logic-vuln -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install yaklang/hack-skills business-logic-vuln --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/business-logic-vuln .gemini/skills/business-logic-vuln && 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 "business-logic-vuln" agent skill from https://github.com/yaklang/hack-skills/tree/main/skills/business-logic-vuln into .gemini/skills/business-logic-vuln/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "business-logic-vuln", 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 business-logic-vulnInstalls 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 business-logic-vuln -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/business-logic-vuln .github/skills/business-logic-vuln && 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 "business-logic-vuln" agent skill from https://github.com/yaklang/hack-skills/tree/main/skills/business-logic-vuln into .github/skills/business-logic-vuln/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "business-logic-vuln", 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 business-logic-vuln -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 business-logic-vuln --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/business-logic-vuln .opencode/skills/business-logic-vuln && 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 "business-logic-vuln" agent skill from https://github.com/yaklang/hack-skills/tree/main/skills/business-logic-vuln into .opencode/skills/business-logic-vuln/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "business-logic-vuln", 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
business-logic-vuln- GitHub stars
- 2.4k
- Token cost
- ~309 tokens
- SKILL.md length
- 116 words
- Files
- 1
- Skills in repo
- 27
- Repo updated
- First seen
- Licence
- MIT
At a glance
Entry P1 category router for business logic testing. An agent skill from yaklang/hack-skills.
- Works in 3 steps: First map key business states and… → Then check for check-then-act windows,… → If the chain depends on APIs, uploads,…
- Race conditions
- 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
Business Logic Vuln is an agent skill from yaklang/hack-skills. Entry P1 category router for business logic testing. Use when workflow abuse, race conditions, pricing flaws, or multi-step state attacks matter more than parser-level input injection.
Its SKILL.md is about 310 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Development, covering Async programming. The repository describes itself as: Helping AI Agent become an awesome practical hacker! The licence is MIT.
When your agent uses it
- Race conditions
- Multi-step state attacks matter more than parser-level input injection
Example prompts
- “/business-logic-vuln”
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- First map key business states and one-time actions
- Then check for check-then-act windows, sequence dependencies, or missing cross-step authorization
- If the chain depends on APIs, uploads, or object permissions, return to the corresponding router skill to complete the path
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
Business Logic Vuln loads about 309 tokens when it runs. Until then it costs about 51 tokens; SKILL.md has 116 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). 116 words, ~309 tokens.
Download SKILL.mdSave it as
.claude/skills/business-logic-vuln/SKILL.md (or your agent's skills folder).- name
- business-logic-vuln
- description
- Entry P1 category router for business logic testing. Use when workflow abuse, race conditions, pricing flaws, or multi-step state attacks matter more than parser-level input injection.
Business Logic Router
This is the routing entry point for business-logic and state-machine issues.
When to Use
- The target involves coupons, inventory, payment, approvals, quotas, invites, trials, or state transitions
- The issue is not parser-level; it is about when checks happen and which business conditions are checked
- You suspect race conditions, workflow bypass, price tampering, negative values, stacked discounts, or multi-step flaws
Skill Map
Recommended Flow
- First map key business states and one-time actions
- Then check for check-then-act windows, sequence dependencies, or missing cross-step authorization
- If the chain depends on APIs, uploads, or object permissions, return to the corresponding router skill to complete the path
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
Just SKILL.md in skills/business-logic-vuln of yaklang/hack-skills.
Open the folder on GitHubat commit 6fbf0bc
Compare with similar skills
Business Logic Vuln 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 |
|---|---|---|---|---|---|---|
| Business Logic Vuln this skillyaklang/hack-skills | 2.4k | — | ~309 | Automated safety check: Pass | MIT | |
| YugabyteDB ASH Instrumentationyugabyte/yugabyte-db | 11k | — | ~4.5k | Automated safety check: Pass | Custom licence | |
| Mirage VFS Adapter Authoringstrukto-ai/mirage | 3.7k | — | ~2.4k | Automated safety check: Pass | Apache-2.0 | |
| Golang Patternsantoniopaya22/go-rest-template | 172 | 9 repos | ~3.5k | Automated safety check: Pass | None | |
| Rust Async Patternsdiodeme/Gold-Band | 143 | 10 repos | ~3.1k | Automated safety check: Pass | AGPL-3.0 | |
| Swift Concurrencyhenrypldev/react-native-nitro-mlx | 100 | 3 repos | ~3.1k | Automated safety check: Pass | MIT |
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Related
Categories
Questions about Business Logic Vuln
What does Business Logic Vuln do?
Entry P1 category router for business logic testing. An agent skill from yaklang/hack-skills. Business Logic Vuln is an agent skill from yaklang/hack-skills. Entry P1 category router for business logic testing.
When should I use Business Logic Vuln?
Business Logic Vuln fits situations like: race conditions; multi-step state attacks matter more than parser-level input injection.
How do I install Business Logic Vuln in Claude Code?
Run `npx skills add yaklang/hack-skills --skill business-logic-vuln -a claude-code`. Or copy the skill folder (skills/business-logic-vuln in yaklang/hack-skills) into .claude/skills/business-logic-vuln in your project. Claude Code loads it when a task matches its description.
How do I install Business Logic Vuln in Codex?
Run `npx skills add yaklang/hack-skills --skill business-logic-vuln -a codex`. Or copy the skill folder (skills/business-logic-vuln in yaklang/hack-skills) into .agents/skills/business-logic-vuln in your project. Codex loads it when a task matches its description.
Can I use Business Logic Vuln 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 business-logic-vuln -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/business-logic-vuln, .gemini/skills/business-logic-vuln, .github/skills/business-logic-vuln and .opencode/skills/business-logic-vuln in your project.
What does Business Logic Vuln need to run?
SKILL.md names no scripts, command-line tools or credentials: Business Logic Vuln is instructions for the agent only.
Does Business Logic Vuln 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 Business Logic Vuln 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 Business Logic Vuln use?
Business Logic Vuln 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 Business Logic Vuln use?
About 309 tokens (SKILL.md is roughly 1.2k 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 Business Logic Vuln?
Skills that share tags, products or a category with Business Logic Vuln: YugabyteDB ASH Instrumentation (yugabyte/yugabyte-db, 11k stars), Mirage VFS Adapter Authoring (strukto-ai/mirage, 3.7k stars), Golang Patterns (antoniopaya22/go-rest-template, 172 stars) and Rust Async Patterns (diodeme/Gold-Band, 143 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Business Logic Vuln?
yaklang (a GitHub organization) maintains it in yaklang/hack-skills, which has 2,418 GitHub stars. The repository holds 27 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.