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Agent skill

React Security

by HoangNguyen0403 in HoangNguyen0403/agent-skills-standard

Prevent XSS, secure auth flows, and harden React client-side applications.

MITAuto-check passedSecurity

Install React Security

skills CLI
$ npx skills add HoangNguyen0403/agent-skills-standard --skill react-security -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install HoangNguyen0403/agent-skills-standard react-security --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/HoangNguyen0403/agent-skills-standard.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/react/react-security .claude/skills/react-security && rm -rf skills-src

Use ~/.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/

Facts

Skill name
react-security
GitHub stars
572
Token cost
~594 tokens
SKILL.md length
206 words
Files
3 (incl. references)
Skills in repo
211
Repo updated
First seen
Licence
MIT

At a glance

Prevent XSS, secure auth flows, and harden React client-side applications.

  • Securing auth flows
  • SKILL.md covers Priority: P0 (CRITICAL), Prevent XSS Attacks, Secure Authentication and Harden Application Boundaries, plus 3 more sections
  • Calls npm and pnpm
  • Auditing third-party dependencies in React

What it does

React Security is an agent skill from HoangNguyen0403/agent-skills-standard. Prevent XSS, secure auth flows, and harden React client-side applications. Use when preventing XSS, securing auth flows, or auditing third-party dependencies in React.

Its SKILL.md is about 590 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `evals/evals.json` and `references/REFERENCE.md`).

It sits in Security, covering Web application vulnerabilities and Authentication. It works with React. The repository describes itself as: A collection of Agent Skills Standard and Best Practice for Programming Languages, Frameworks that help our AI Agent follow best practies on frameworks and programming laguages. The licence is MIT.

When your agent uses it

  • Securing auth flows
  • Auditing third-party dependencies in React

Example prompts

  • “/react-security”

What it can do on your machine

Read from SKILL.md and the folder at commit b529c2d. 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:

    • npm
    • pnpm

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use npm and pnpm, 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 Security loads about 594 tokens when it runs, and up to ~1.7k if it reads all its reference files. Until then it costs about 46 tokens; SKILL.md has 206 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~46
When it runs · the whole SKILL.md, loaded when a task matches
~594
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.7k

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 HoangNguyen0403/agent-skills-standard at commit b529c2d, republished under its MIT licence (© HoangNguyen0403). 206 words, ~594 tokens.

Download SKILL.mdSave it as .claude/skills/react-security/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.
name
react-security
description
Prevent XSS, secure auth flows, and harden React client-side applications. Use when preventing XSS, securing auth flows, or auditing third-party dependencies in React.

React Security

Priority: P0 (CRITICAL)

Prevent XSS Attacks

  • Never use dangerouslySetInnerHTML without sanitization. Use DOMPurify.sanitize(input) for all user-provided HTML.
  • Avoid javascript: protocols in href or src.

See implementation examples for DOMPurify sanitization and secure cookie configuration.

Secure Authentication

  • Store JWT/Sessions in HttpOnly and Secure cookies to prevent theft via XSS. Never store secrets in localStorage or in built JS bundle.
  • Data Flow: Escape all serialized state if injecting into HTML (e.g., in SSR). Use Content Security Policy (CSP) to restrict script sources and prevent inline execution.

Harden Application Boundaries

  • CSRF Protection: Use CSRF tokens for state-changing requests (PUT/POST/DELETE). Implement SameSite=Strict cookies where applicable.
  • Input Sanitization: Always validate and sanitize user inputs on backend. Frontend validation for UX only.
  • Dependency Management: Run npm audit / pnpm audit regularly. Pin specific dependency versions and use npm-check-updates.
  • Security Headers: Ensure server sends X-Frame-Options: DENY, X-Content-Type-Options: nosniff, and Permissions-Policy.

Anti-Patterns

  • No eval(): RCE risk.
  • No Serialized State: Don't inject JSON into DOM without escaping.
  • No Client Logic for Permissions: Backend must validate.

References

See references/REFERENCE.md for DOMPurify usage, CSP headers, OAuth2/JWT auth patterns, and CSRF protection.

Canonical response anchors

When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:

  • Pin specific dependency versions

© HoangNguyen0403, 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 2 other files (references) in skills/react/react-security of HoangNguyen0403/agent-skills-standard.

  • SKILL.md
  • evals/evals.json
  • references/REFERENCE.md

Open the folder on GitHubat commit b529c2d

Compare with similar skills

React 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.

React Security compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
React Security this skillHoangNguyen0403/agent-skills-standard572—~594Automated safety check: PassMIT
Security Reviewjewbetcha/opentrace11618 repos~3.1kAutomated safety check: NotesMIT
Code Review Securitynicepkg/auto-company1951 repos~3.9kAutomated safety check: PassMIT
API Security Checklistrevfactory/harness-1001.3k—~1.7kAutomated safety check: PassApache-2.0
Secure Code GuardianJeffallan/claude-skills12k—~1.8kAutomated safety check: PassMIT
Defending Applicationstelagod/code-abyss244—~777Automated safety check: PassMIT

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Works with

Categories

Questions about React Security

What does React Security do?

Prevent XSS, secure auth flows, and harden React client-side applications. React Security is an agent skill from HoangNguyen0403/agent-skills-standard. Prevent XSS, secure auth flows, and harden React client-side applications.

When should I use React Security?

React Security fits situations like: securing auth flows; auditing third-party dependencies in React.

How do I install React Security in Claude Code?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill react-security -a claude-code`. Or copy the skill folder (skills/react/react-security in HoangNguyen0403/agent-skills-standard) into .claude/skills/react-security in your project. Claude Code loads it when a task matches its description.

How do I install React Security in Codex?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill react-security -a codex`. Or copy the skill folder (skills/react/react-security in HoangNguyen0403/agent-skills-standard) into .agents/skills/react-security in your project. Codex loads it when a task matches its description.

Can I use React 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 HoangNguyen0403/agent-skills-standard --skill react-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/react-security, .gemini/skills/react-security, .github/skills/react-security and .opencode/skills/react-security in your project.

What does React Security need to run?

Going by SKILL.md and its folder, React Security needs the command-line tools its instructions call (npm and pnpm).

Does React Security access the network?

SKILL.md contains no URLs. Its commands use npm, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is React 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 React Security use?

React Security 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 Security use?

About 594 tokens (SKILL.md is roughly 2.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.1k tokens, read only when the agent opens those files.

What are the alternatives to React Security?

Skills that share tags, products or a category with React Security: Security Review (jewbetcha/opentrace, 116 stars), Code Review Security (nicepkg/auto-company, 195 stars), API Security Checklist (revfactory/harness-100, 1.3k stars) and Secure Code Guardian (Jeffallan/claude-skills, 12k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains React Security?

HoangNguyen0403 (a GitHub user) maintains it in HoangNguyen0403/agent-skills-standard, which has 572 GitHub stars. The repository holds 211 skills in this directory. The repository was last updated on October 9, 2026.

Source: HoangNguyen0403/agent-skills-standard on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.