frontend-security SKILL.md skillA
frontend-security from miladjoodi/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add miladjoodi/skills/frontend-security@git:20261011.fd3e3ebPins git:20261011.fd3e3eb in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- miladjoodi/skills
- Path
skills/frontend-security/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261011.fd3e3eb, committed Oct 11, 2026
- Size
- 6,616 bytes
- Repository stars
- 23
- License
- MIT
Secure-by-default guidance for writing, reviewing, and fixing frontend code in React and Next.js (App Router) - XSS and unsafe HTML, dangerouslySetInnerHTML, DOMPurify, URL and redirect validation, Content Security Policy with nonces, security headers (HSTS, nosniff, frame-ancestors, Referrer-Policy, Permissions-Policy), CORS, cookies and token storage, CSRF, Server Action and Route Handler hardening, third-party scripts and SRI, npm supply-chain risk, form and input validation, file uploads…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Frontend Security (React / Next.js) Rules for writing, reviewing, and fixing frontend code so it is secure by default. Prefer small, targeted changes that preserve existing behavior. Concrete fixes over theory. Last reviewed: October 2026. Version-sensitive details (Next.js APIs, header values) change; see "Verify before asserting" below. ## How to work 1. **Inspect first.** Read `package.json` (Next.js and React versions), the router in use (App Router or Pages), the auth model (cookie session or bearer token), and where headers are set today (`proxy.ts` / `middleware.ts`, `next.config`, reverse proxy, hosting platform). Do not add a protection that already exists or conflicts with one that does. 2. **Trace untrusted data** from source (user input, URL, API, CMS, uploads, third parties) to sink (DOM, URL, cookie, DB, redirect, file path). Security bugs live at the sinks. 3. **Pick the mode:** implementing, fixing, or auditing. For audits, report each finding with severity, file and line, evidence, and a concrete fix. Do not pad the report with generic advice. 4. **Make the smallest secure change.** Do not rewrite an auth or deployment architecture when a targeted fix works. …
Read the whole file at its exact version.
How to install
mdr add miladjoodi/skills/frontend-security@sha256:a40ca0686bf74bc5The line at the top of this page pins the label git:20261011.fd3e3eb, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_smc3w6fq6nuyhtt3)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 11, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6616 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
miladjoodi/skills · 23 stars · license MIT · pushed 2026-10-13 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_smc3w6fq6nuyhtt3 GET https://markdownregistry.com/api/v1/resolve?ref=miladjoodi/skills/frontend-security GET https://markdownregistry.com/api/v1/blob/a40ca0686bf74bc57bc1c0a30fb3af52e8d687968b17dafce4a147519854e3de
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.