API Security Best Practices
davila7/claude-code-templates
Implement secure API design patterns including authentication, authorization, input validation, rate limiting, and protection against common API vulnerabilities
The Contracts & Security review perspective for PostHog Review.
Install Review Hog Perspective Contracts Security
$ npx skills add PostHog/posthog --skill review-hog-perspective-contracts-security -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install PostHog/posthog review-hog-perspective-contracts-security --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/products/review_hog/skills/review-hog-perspective-contracts-security .claude/skills/review-hog-perspective-contracts-security && 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 "review-hog-perspective-contracts-security" agent skill from https://github.com/PostHog/posthog/tree/master/products/review_hog/skills/review-hog-perspective-contracts-security into .claude/skills/review-hog-perspective-contracts-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "review-hog-perspective-contracts-security", 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/products/review_hog/skills/review-hog-perspective-contracts-securityType 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 review-hog-perspective-contracts-security -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install PostHog/posthog review-hog-perspective-contracts-security --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/products/review_hog/skills/review-hog-perspective-contracts-security .agents/skills/review-hog-perspective-contracts-security && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "review-hog-perspective-contracts-security" agent skill from https://github.com/PostHog/posthog/tree/master/products/review_hog/skills/review-hog-perspective-contracts-security into .agents/skills/review-hog-perspective-contracts-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "review-hog-perspective-contracts-security", 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 review-hog-perspective-contracts-security -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install PostHog/posthog review-hog-perspective-contracts-security --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/products/review_hog/skills/review-hog-perspective-contracts-security .cursor/skills/review-hog-perspective-contracts-security && 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 "review-hog-perspective-contracts-security" agent skill from https://github.com/PostHog/posthog/tree/master/products/review_hog/skills/review-hog-perspective-contracts-security into .cursor/skills/review-hog-perspective-contracts-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "review-hog-perspective-contracts-security", 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 products/review_hog/skills/review-hog-perspective-contracts-security--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 review-hog-perspective-contracts-security -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install PostHog/posthog review-hog-perspective-contracts-security --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/products/review_hog/skills/review-hog-perspective-contracts-security .gemini/skills/review-hog-perspective-contracts-security && 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 "review-hog-perspective-contracts-security" agent skill from https://github.com/PostHog/posthog/tree/master/products/review_hog/skills/review-hog-perspective-contracts-security into .gemini/skills/review-hog-perspective-contracts-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "review-hog-perspective-contracts-security", 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 review-hog-perspective-contracts-securityInstalls 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 review-hog-perspective-contracts-security -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/products/review_hog/skills/review-hog-perspective-contracts-security .github/skills/review-hog-perspective-contracts-security && 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 "review-hog-perspective-contracts-security" agent skill from https://github.com/PostHog/posthog/tree/master/products/review_hog/skills/review-hog-perspective-contracts-security into .github/skills/review-hog-perspective-contracts-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "review-hog-perspective-contracts-security", 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 review-hog-perspective-contracts-security -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 review-hog-perspective-contracts-security --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/products/review_hog/skills/review-hog-perspective-contracts-security .opencode/skills/review-hog-perspective-contracts-security && 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 "review-hog-perspective-contracts-security" agent skill from https://github.com/PostHog/posthog/tree/master/products/review_hog/skills/review-hog-perspective-contracts-security into .opencode/skills/review-hog-perspective-contracts-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "review-hog-perspective-contracts-security", 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
review-hog-perspective-contracts-security- GitHub stars
- 40k
- Token cost
- ~1k tokens
- SKILL.md length
- 436 words
- Files
- 1
- Skills in repo
- 252
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
The Contracts & Security review perspective for PostHog Review.
- Works in 4 steps: API contracts & breaking changes → Security vulnerabilities → Input validation & boundaries → …
- Tasks that involve API design
- SKILL.md covers Primary investigation areas, Investigation commands, Where to focus and What to leave to other…, plus 2 more sections
- Calls rg
What it does
Review Hog Perspective Contracts Security is an agent skill from PostHog/posthog, published by the product's own GitHub organization. The Contracts & Security review perspective for PostHog Review. Verifies that changed code is safe and maintains compatibility: API contracts and breaking changes, injection / authz / data exposure, input validation, and schema / interface alignment. Reports security and contract issues only.
Its SKILL.md is about 1k 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 API design, Authorization and RBAC and Security review. It works with PostHog. 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
- Tasks that involve API design
- Tasks that involve Authorization and RBAC
- Tasks that involve Security review
Example prompts
- “/review-hog-perspective-contracts-security”
Workflow steps
4 steps, taken from the first numbered list in SKILL.md.
- API contracts & breaking changes
- Security vulnerabilities
- Input validation & boundaries
- Schema & interface alignment
What it can do on your machine
Read from SKILL.md and the folder at commit 812e5c6. 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:
rg
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
Review Hog Perspective Contracts Security loads about 1k tokens when it runs. Until then it costs about 84 tokens; SKILL.md has 436 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
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 436 words (~1,005 tokens).
“You are reviewing a PR chunk through the Contracts & Security perspective: is the code safe, and does it preserve compatibility? Concentrate on API contracts and breaking changes, security vulnerabilities, input validation, and schema / interface alignment.”
- name
- review-hog-perspective-contracts-security
- metadata.owner_team
- review_hog
- metadata.perspective
- contracts_security
Files
Just SKILL.md in products/review_hog/skills/review-hog-perspective-contracts-security of PostHog/posthog.
Open the folder on GitHubat commit 812e5c6
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
Review Hog Perspective Contracts Security 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 |
|---|---|---|---|---|---|---|
| Review Hog Perspective Contracts Security this skillPostHog/posthog | 40k | — | ~1k | Automated safety check: Pass | Custom licence | |
| API Security Best Practicesdavila7/claude-code-templates | 32k | 8 repos | ~5.8k | Automated safety check: Pass | MIT | |
| Vercel Security Basicsjeremylongshore/tons-of-skills-marketplace | 2.8k | — | ~1.9k | Automated safety check: Notes | MIT | |
| Framer Security Basicsjeremylongshore/tons-of-skills-marketplace | 2.8k | — | ~767 | Automated safety check: Notes | MIT | |
| Review Securityhashgraph-online/awesome-codex-plugins | 1.3k | — | ~601 | Automated safety check: Pass | Apache-2.0 | |
| Security Review ChecklistZeroDeng01/sublinkPro | 1.7k | — | ~2.3k | Automated safety check: Pass | MIT |
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Questions about Review Hog Perspective Contracts Security
What does Review Hog Perspective Contracts Security do?
The Contracts & Security review perspective for PostHog Review. Review Hog Perspective Contracts Security is an agent skill from PostHog/posthog, published by the product's own GitHub organization. The Contracts & Security review perspective for PostHog Review.
When should I use Review Hog Perspective Contracts Security?
Review Hog Perspective Contracts Security fits situations like: tasks that involve API design; tasks that involve Authorization and RBAC; tasks that involve Security review.
How do I install Review Hog Perspective Contracts Security in Claude Code?
Run `npx skills add PostHog/posthog --skill review-hog-perspective-contracts-security -a claude-code`. Or copy the skill folder (products/review_hog/skills/review-hog-perspective-contracts-security in PostHog/posthog) into .claude/skills/review-hog-perspective-contracts-security in your project. Claude Code loads it when a task matches its description.
How do I install Review Hog Perspective Contracts Security in Codex?
Run `npx skills add PostHog/posthog --skill review-hog-perspective-contracts-security -a codex`. Or copy the skill folder (products/review_hog/skills/review-hog-perspective-contracts-security in PostHog/posthog) into .agents/skills/review-hog-perspective-contracts-security in your project. Codex loads it when a task matches its description.
Can I use Review Hog Perspective Contracts Security 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 review-hog-perspective-contracts-security -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/review-hog-perspective-contracts-security, .gemini/skills/review-hog-perspective-contracts-security, .github/skills/review-hog-perspective-contracts-security and .opencode/skills/review-hog-perspective-contracts-security in your project.
What does Review Hog Perspective Contracts Security need to run?
Going by SKILL.md and its folder, Review Hog Perspective Contracts Security needs the command-line tools its instructions call (rg).
Does Review Hog Perspective Contracts Security 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 Review Hog Perspective Contracts Security 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 Review Hog Perspective Contracts Security use?
Review Hog Perspective Contracts Security 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 Review Hog Perspective Contracts Security use?
About 1k tokens (SKILL.md is roughly 4k 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 Review Hog Perspective Contracts Security?
Skills that share tags, products or a category with Review Hog Perspective Contracts Security: API Security Best Practices (davila7/claude-code-templates, 32k stars), Vercel Security Basics (jeremylongshore/tons-of-skills-marketplace, 2.8k stars), Framer Security Basics (jeremylongshore/tons-of-skills-marketplace, 2.8k stars) and Review Security (hashgraph-online/awesome-codex-plugins, 1.3k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Review Hog Perspective Contracts Security?
PostHog (a GitHub organization, an official publisher) maintains it in PostHog/posthog, which has 40,200 GitHub stars. The repository holds 252 skills in this directory. The repository was last updated on October 9, 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.