best-practices SKILL.md skillB
best-practices from tech-leads-club/agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add tech-leads-club/agent-skills/best-practices@v1.0Pins v1.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- tech-leads-club/agent-skills
- Path
packages/skills-catalog/skills/(quality)/web-best-practices/SKILL.md- Versions recorded
- 3
- Latest version
- v1.0, committed Jun 11, 2026
- First version recorded
- Feb 5, 2026
- Size
- 12,782 bytes
- Repository stars
- 7,143
- License
- a license file GitHub does not identify
Apply modern web development best practices for security, compatibility, and code quality. Use when asked to "apply best practices", "security audit", "modernize code", "code quality review", or "check for vulnerabilities". Do NOT use for accessibility (use web-accessibility), SEO (use seo), performance (use core-web-vitals), or comprehensive multi-area audits (use web-quality-audit).
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
# Best practices
Modern web development standards based on Lighthouse best practices audits. Covers security, browser compatibility, and code quality patterns.
## Security
### HTTPS everywhere
**Enforce HTTPS:**
```html
<!-- ❌ Mixed content -->
<img src="http://example.com/image.jpg" />
<script src="http://cdn.example.com/script.js"></script>
<!-- ✅ HTTPS only -->
<img src="https://example.com/image.jpg" />
<script src="https://cdn.example.com/script.js"></script>
<!-- ✅ Protocol-relative (will use page's protocol) -->
<img src="//example.com/image.jpg" />
```
**HSTS Header:**
```
Strict-Transport-Security: max-age=31536000; includeSubDomains; preload
```
### Content Security Policy (CSP)
```html
<!-- Basic CSP via meta tag -->
<meta
http-equiv="Content-Security-Policy"
content="default-src 'self';
script-src 'self' https://trusted-cdn.com;
style-src 'self' 'unsafe-inline';
img-src 'self' data: https:;
connect-src 'self' https://api.example.com;"
/>
<!-- Better: HTTP header -->
```
**CSP Header (recommended):**
```
Content-Security-Policy:
default-src 'self';
…Read the whole file at its exact version.
How to install
mdr add tech-leads-club/agent-skills/best-practices@sha256:fc5c162eed0bc344The line at the top of this page pins the label v1.0, 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_kvwszuuuql7dirs2)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Feb 5, 2026 and Jun 11, 2026, about one every 63 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0 latest | 2026-06-11 | 5f9b25d | 12,782 B | B | view · diff |
| v1.0 | 2026-02-26 | 8dca459 | 12,678 B | B | view · diff |
| v1.0 | 2026-02-05 | 905f8bb | 12,514 B | B | view |
Audit of the latest version
- fail: No script tag (matched: <script)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (12782 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
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
tech-leads-club/agent-skills · 7,143 stars · license a license file GitHub does not identify · pushed 2026-11-05 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_kvwszuuuql7dirs2 GET https://markdownregistry.com/api/v1/resolve?ref=tech-leads-club/agent-skills/best-practices GET https://markdownregistry.com/api/v1/blob/fc5c162eed0bc3442cfe1bb4c4b3bcfe4cc28a847d272dba1a087f54ed6ff6bf
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.
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