Vibe Check
benavlabs/vibe-check
Security audit for web apps, especially AI-built ("vibe coded") ones.
Focused security audit of code, calibrated to surface real exploitable bugs and suppress theoretical findings.
Install Security Audit
The automated check flagged lines worth reading first. See the safety section below.
$ npx skills add PostHog/posthog --skill security-audit -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install PostHog/posthog security-audit --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/PostHog/posthog.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/security-audit .claude/skills/security-audit && 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 "security-audit" agent skill from https://github.com/PostHog/posthog/tree/master/.agents/skills/security-audit into .claude/skills/security-audit/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "security-audit", 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/PostHog/posthog/tree/master/.agents/skills/security-auditType 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 PostHog/posthog --skill security-audit -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install PostHog/posthog security-audit --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PostHog/posthog.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/security-audit .agents/skills/security-audit && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "security-audit" agent skill from https://github.com/PostHog/posthog/tree/master/.agents/skills/security-audit into .agents/skills/security-audit/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "security-audit", 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 PostHog/posthog --skill security-audit -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install PostHog/posthog security-audit --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PostHog/posthog.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/security-audit .cursor/skills/security-audit && 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 "security-audit" agent skill from https://github.com/PostHog/posthog/tree/master/.agents/skills/security-audit into .cursor/skills/security-audit/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "security-audit", 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/PostHog/posthog.git --path .agents/skills/security-audit--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 PostHog/posthog --skill security-audit -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install PostHog/posthog security-audit --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PostHog/posthog.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/security-audit .gemini/skills/security-audit && 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 "security-audit" agent skill from https://github.com/PostHog/posthog/tree/master/.agents/skills/security-audit into .gemini/skills/security-audit/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "security-audit", 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 PostHog/posthog security-auditInstalls 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 PostHog/posthog --skill security-audit -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/PostHog/posthog.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/security-audit .github/skills/security-audit && 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 "security-audit" agent skill from https://github.com/PostHog/posthog/tree/master/.agents/skills/security-audit into .github/skills/security-audit/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "security-audit", 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 PostHog/posthog --skill security-audit -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install PostHog/posthog security-audit --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PostHog/posthog.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/security-audit .opencode/skills/security-audit && 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 "security-audit" agent skill from https://github.com/PostHog/posthog/tree/master/.agents/skills/security-audit into .opencode/skills/security-audit/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "security-audit", 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
security-audit- GitHub stars
- 40k
- Token cost
- ~8k tokens
- SKILL.md length
- 4,164 words
- Files
- 1
- Skills in repo
- 252
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Focused security audit of code, calibrated to surface real exploitable bugs and suppress theoretical findings.
- Works in 7 steps: Broken access control — almost always… → Injection → Authentication & secrets → …
- The user asks to audit
- SKILL.md covers Input, Calibration — read this first, What to audit (in priority… and Methodology, plus 6 more sections
- Calls git and gh; needs SECRET_KEY
What it does
Security Audit is an agent skill from PostHog/posthog, published by the product's own GitHub organization. Focused security audit of code, calibrated to surface real exploitable bugs and suppress theoretical findings. Use when the user asks to "audit", "security-audit", "find vulnerabilities", "check for IDOR/SSRF/XSS/injection", or wants a security review of a file, directory, branch diff, or PR. Covers access control, injection, auth/secrets, sensitive data, business logic, web boundary, and AI agent/LLM trifecta risks. Produces calibrated findings with data flow, exploit request, fix, and confidence — no…
Its SKILL.md is about 8k 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 Security, covering Security review, Web application vulnerabilities and Authorization and RBAC. It works with Git. The repository describes itself as: :hedgehog: PostHog is the leading platform for building self-driving products. Our developer tools – AI observability, analytics, session replay, flags, experiments, error…
When your agent uses it
- The user asks to audit
- Find vulnerabilities
- Check for IDOR/SSRF/XSS/injection
- Wants a security review of a file
Example prompts
- “security-audit”
- “find vulnerabilities”
- “check for IDOR/SSRF/XSS/injection”
- “/security-audit”
Requirements
- Python 3
- A credential in SECRET_KEY
Workflow steps
7 steps, taken from the step headings in SKILL.md.
- Broken access control — almost always the highest-impact class in SaaS
- Injection
- Authentication & secrets
- Sensitive data exposure
- Business logic & state
- Web boundary
- AI agent & LLM sandboxes
What it can do on your machine
Read from SKILL.md and the folder at commit 10f9ad7. 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
Shell commands in SKILL.md call:
gitgh
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use git and gh, which can reach the network depending on how they are called.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names these keys or tokens, usually read from environment variables:
SECRET_KEY
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Security Audit loads about 8k tokens when it runs. Until then it costs about 140 tokens; SKILL.md has 4,164 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: warnings
The automated check found patterns that need a careful read before installing.
- WarningMentions a credentials file (SSH keys, cloud or package-manager tokens)SKILL.md:184
ns, no `~/.aws` / `~/.config/gcloud` / `~/.ssh`, no service-account JSON, no DB connection strings inside the sandbox im
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
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 4,164 words (~8,028 tokens).
“You are a senior application security engineer auditing code for exploitable vulnerabilities. Your job is to find real, demonstrable bugs — not theoretical concerns, not best-practice nudges, not style nits.”
- name
- security-audit
Files
Just SKILL.md in .agents/skills/security-audit of PostHog/posthog.
Open the folder on GitHubat commit 10f9ad7
Used in 1 other repository
We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders. This page covers the copy in PostHog/posthog, which our catalogue first saw on October 8, 2026.
Compare with similar skills
Security Audit 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 |
|---|---|---|---|---|---|---|
| Security Audit this skillPostHog/posthog | 40k | — | ~8k | Automated safety check: Warn | Custom licence | |
| Vibe Checkbenavlabs/vibe-check | 118 | — | ~1.1k | Automated safety check: Notes | MIT | |
| Security Reviewkklimuk/docx-cli | 216 | — | ~1.7k | Automated safety check: Pass | MIT | |
| Security Reviewlangfuse/langfuse | 36k | — | ~1.4k | Automated safety check: Pass | Custom licence | |
| Security Auditjellydn/my-ai-tools | 123 | — | ~2.9k | Automated safety check: Notes | MIT | |
| Security Reviewgithub/awesome-copilot | 40k | 1 repos | ~2.3k | Automated safety check: Notes | MIT |
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Questions about Security Audit
What does Security Audit do?
Focused security audit of code, calibrated to surface real exploitable bugs and suppress theoretical findings. Security Audit is an agent skill from PostHog/posthog, published by the product's own GitHub organization. Focused security audit of code, calibrated to surface real exploitable bugs and suppress theoretical findings.
When should I use Security Audit?
Security Audit fits situations like: the user asks to audit; find vulnerabilities; check for IDOR/SSRF/XSS/injection; wants a security review of a file.
How do I install Security Audit in Claude Code?
Run `npx skills add PostHog/posthog --skill security-audit -a claude-code`. Or copy the skill folder (.agents/skills/security-audit in PostHog/posthog) into .claude/skills/security-audit in your project. Claude Code loads it when a task matches its description.
How do I install Security Audit in Codex?
Run `npx skills add PostHog/posthog --skill security-audit -a codex`. Or copy the skill folder (.agents/skills/security-audit in PostHog/posthog) into .agents/skills/security-audit in your project. Codex loads it when a task matches its description.
Can I use Security Audit 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 PostHog/posthog --skill security-audit -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/security-audit, .gemini/skills/security-audit, .github/skills/security-audit and .opencode/skills/security-audit in your project.
What does Security Audit need to run?
Going by SKILL.md and its folder, Security Audit needs the command-line tools its instructions call (git and gh) and credentials named SECRET_KEY. Our summary lists: Python 3; A credential in SECRET_KEY.
Does Security Audit access the network?
SKILL.md contains no URLs. Its commands use git and gh, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Security Audit safe to install?
Our automated static check of SKILL.md flagged 1 warning(s): mentions a credentials file (ssh keys, cloud or package-manager tokens). Read the flagged lines before installing; the check is not a guarantee either way.
What licence does Security Audit use?
Security Audit has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Security Audit use?
About 8k tokens (SKILL.md is roughly 32k 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 Security Audit?
Skills that share tags, products or a category with Security Audit: Vibe Check (benavlabs/vibe-check, 118 stars), Security Review (kklimuk/docx-cli, 216 stars), Security Review (langfuse/langfuse, 36k stars) and Security Audit (jellydn/my-ai-tools, 123 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Security Audit?
PostHog (a GitHub organization, an official publisher) maintains it in PostHog/posthog, which has 40,182 GitHub stars. The repository holds 252 skills in this directory. The repository was last updated on October 8, 2026.
Source: PostHog/posthog on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.