Coding Standards
kurealnum/dotfiles
Universal coding standards, best practices, and patterns for TypeScript, JavaScript, React, and Node.js development.
Diagnose and fix React codebase health issues. An agent skill from PostHog/posthog-foss.
Install React Doctor
$ npx skills add PostHog/posthog-foss --skill react-doctor -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install PostHog/posthog-foss react-doctor --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-foss.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/react-doctor .claude/skills/react-doctor && 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 "react-doctor" agent skill from https://github.com/PostHog/posthog-foss/tree/master/.agents/skills/react-doctor into .claude/skills/react-doctor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react-doctor", 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-foss/tree/master/.agents/skills/react-doctorType 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-foss --skill react-doctor -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install PostHog/posthog-foss react-doctor --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PostHog/posthog-foss.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/react-doctor .agents/skills/react-doctor && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "react-doctor" agent skill from https://github.com/PostHog/posthog-foss/tree/master/.agents/skills/react-doctor into .agents/skills/react-doctor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react-doctor", 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-foss --skill react-doctor -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install PostHog/posthog-foss react-doctor --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PostHog/posthog-foss.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/react-doctor .cursor/skills/react-doctor && 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 "react-doctor" agent skill from https://github.com/PostHog/posthog-foss/tree/master/.agents/skills/react-doctor into .cursor/skills/react-doctor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react-doctor", 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-foss.git --path .agents/skills/react-doctor--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-foss --skill react-doctor -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install PostHog/posthog-foss react-doctor --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PostHog/posthog-foss.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/react-doctor .gemini/skills/react-doctor && 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 "react-doctor" agent skill from https://github.com/PostHog/posthog-foss/tree/master/.agents/skills/react-doctor into .gemini/skills/react-doctor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react-doctor", 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-foss react-doctorInstalls 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-foss --skill react-doctor -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/PostHog/posthog-foss.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/react-doctor .github/skills/react-doctor && 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 "react-doctor" agent skill from https://github.com/PostHog/posthog-foss/tree/master/.agents/skills/react-doctor into .github/skills/react-doctor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react-doctor", 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-foss --skill react-doctor -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-foss react-doctor --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PostHog/posthog-foss.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/react-doctor .opencode/skills/react-doctor && 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 "react-doctor" agent skill from https://github.com/PostHog/posthog-foss/tree/master/.agents/skills/react-doctor into .opencode/skills/react-doctor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react-doctor", 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
react-doctor- GitHub stars
- 721
- Used in
- 4 other repos
- Token cost
- ~371 tokens
- SKILL.md length
- 150 words
- Files
- 1
- Skills in repo
- 213
- Repo updated
- First seen
- Licence
- MIT
At a glance
Diagnose and fix React codebase health issues. An agent skill from PostHog/posthog-foss.
- Works in 4 steps: Run the command above at the project root → Read every diagnostic with file paths… → Fix issues starting with errors (highest… → …
- Reviewing React code
- SKILL.md covers Usage, Workflow, Rules (47+) and Score
- Calls npx
What it does
React Doctor is an agent skill from PostHog/posthog-foss, published by the product's own GitHub organization. Diagnose and fix React codebase health issues. Use when reviewing React code, fixing performance problems, auditing security, or improving code quality.
Its SKILL.md is about 370 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 Code quality. It works with React. The repository describes itself as: PostHog FOSS is a read-only mirror of PostHog, with all proprietary code removed. NOTE: This repo is synced automatically from the main PostHog repo. Please raise any issues and… The licence is MIT.
When your agent uses it
- Reviewing React code
- Fixing performance problems
- Auditing security
- Improving code quality
Example prompts
- “/react-doctor”
Requirements
- Node.js
Workflow steps
4 steps, taken from the first numbered list in SKILL.md.
- Run the command above at the project root
- Read every diagnostic with file paths and line numbers
- Fix issues starting with errors (highest severity)
- Re-run to verify the score improved
What it can do on your machine
Read from SKILL.md and the folder at commit 2c48221. 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:
npx
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use npx, 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 no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
React Doctor loads about 371 tokens when it runs. Until then it costs about 41 tokens; SKILL.md has 150 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 PostHog/posthog-foss at commit 2c48221, republished under its MIT licence (© PostHog). 150 words, ~371 tokens.
Download SKILL.mdSave it as
.claude/skills/react-doctor/SKILL.md (or your agent's skills folder).- name
- react-doctor
- description
- Diagnose and fix React codebase health issues. Use when reviewing React code, fixing performance problems, auditing security, or improving code quality.
- version
- 1.0.0
React Doctor
Scans your React codebase for security, performance, correctness, and architecture issues. Outputs a 0-100 score with actionable diagnostics.
Usage
npx -y react-doctor@latest . --verboseWorkflow
- Run the command above at the project root
- Read every diagnostic with file paths and line numbers
- Fix issues starting with errors (highest severity)
- Re-run to verify the score improved
Rules (47+)
- Security: hardcoded secrets in client bundle, eval()
- State & Effects: derived state in useEffect, missing cleanup, useState from props, cascading setState
- Architecture: components inside components, giant components, inline render functions
- Performance: layout property animations, transition-all, large blur values
- Correctness: array index as key, conditional rendering bugs
- Next.js: missing metadata, client-side fetching for server data, async client components
- Bundle Size: barrel imports, full lodash, moment.js, missing code splitting
- Server: missing auth in server actions, blocking without after()
- Accessibility: missing prefers-reduced-motion
- Dead Code: unused files, exports, types
Score
- 75+: Great
- 50-74: Needs work
- 0-49: Critical
© PostHog, 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 .agents/skills/react-doctor of PostHog/posthog-foss.
Open the folder on GitHubat commit 2c48221
Used in 4 other repositories
We found 4 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 4 other GitHub owners. This page covers the copy in PostHog/posthog-foss, which our catalogue first saw on October 7, 2026.
Compare with similar skills
React Doctor 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 |
|---|---|---|---|---|---|---|
| React Doctor this skillPostHog/posthog-foss | 721 | 4 repos | ~371 | Automated safety check: Pass | MIT | |
| Coding Standardskurealnum/dotfiles | 290 | 17 repos | ~2.9k | Automated safety check: Pass | None | |
| Code Review SkillRain-kl/OpenFlare | 288 | — | ~2.3k | Automated safety check: Notes | MIT | |
| Qovery Console StandardsQovery/console | 227 | — | ~924 | Automated safety check: Pass | MIT | |
| Clean Code Refactorerfike/fastapi-blog | 101 | — | ~402 | Automated safety check: Pass | MIT | |
| Code Review Excellenceandrew-yangy/gru-ai | 155 | — | ~1.7k | Automated safety check: Notes | MIT |
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Categories
Questions about React Doctor
What does React Doctor do?
Diagnose and fix React codebase health issues. An agent skill from PostHog/posthog-foss. React Doctor is an agent skill from PostHog/posthog-foss, published by the product's own GitHub organization. Diagnose and fix React codebase health issues.
When should I use React Doctor?
React Doctor fits situations like: reviewing React code; fixing performance problems; auditing security; improving code quality.
How do I install React Doctor in Claude Code?
Run `npx skills add PostHog/posthog-foss --skill react-doctor -a claude-code`. Or copy the skill folder (.agents/skills/react-doctor in PostHog/posthog-foss) into .claude/skills/react-doctor in your project. Claude Code loads it when a task matches its description.
How do I install React Doctor in Codex?
Run `npx skills add PostHog/posthog-foss --skill react-doctor -a codex`. Or copy the skill folder (.agents/skills/react-doctor in PostHog/posthog-foss) into .agents/skills/react-doctor in your project. Codex loads it when a task matches its description.
Can I use React Doctor 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-foss --skill react-doctor -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/react-doctor, .gemini/skills/react-doctor, .github/skills/react-doctor and .opencode/skills/react-doctor in your project.
What does React Doctor need to run?
Going by SKILL.md and its folder, React Doctor needs the command-line tools its instructions call (npx). Our summary lists: Node.js.
Does React Doctor access the network?
SKILL.md contains no URLs. Its commands use npx, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is React Doctor 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 React Doctor use?
React Doctor 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 React Doctor use?
About 371 tokens (SKILL.md is roughly 1.5k 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 React Doctor?
Skills that share tags, products or a category with React Doctor: Coding Standards (kurealnum/dotfiles, 290 stars), Code Review Skill (Rain-kl/OpenFlare, 288 stars), Qovery Console Standards (Qovery/console, 227 stars) and Clean Code Refactorer (fike/fastapi-blog, 101 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains React Doctor?
PostHog (a GitHub organization, an official publisher) maintains it in PostHog/posthog-foss, which has 721 GitHub stars. The repository holds 213 skills in this directory. The repository was last updated on October 7, 2026.
Source: PostHog/posthog-foss on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.