JavaScript Best Practices SKILL.md skillA
JavaScript Best Practices from hoangnguyen0403/agent-skills-standard is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add hoangnguyen0403/agent-skills-standard/JavaScript Best Practices@git:20260509.3e36716Pins git:20260509.3e36716 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- hoangnguyen0403/agent-skills-standard
- Path
.agents/skills/javascript/best-practices/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260509.3e36716, committed May 9, 2026
- Size
- 1,626 bytes
- Repository stars
- 583
- License
- MIT
Idiomatic JavaScript patterns and conventions for maintainable code.
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
# JavaScript Best Practices
## **Priority: P1 (OPERATIONAL)**
Conventions and patterns for writing maintainable JavaScript.
## Implementation Guidelines
- **Naming**: `camelCase` (vars/funcs), `PascalCase` (classes), `UPPER_SNAKE` (constants).
- **Errors**: Throw `Error` objects only. Handle all async errors.
- **Comments**: JSDoc for APIs. Explain "why" not "what".
- **Files**: One entity per file. `index.js` for exports.
- **Modules**: Named exports only. Order: Ext -> Int -> Rel.
## Anti-Patterns
- **No Globals**: Encapsulate state.
- **No Magic Numbers**: Use `const`.
- **No Nesting**: Guard clauses/early returns.
- **No Defaults**: Use named exports.
- **No Side Effects**: Keep functions pure.
## Code
```javascript
// Constants
const STATUS = { OK: 200, ERROR: 500 };
// Errors
class APIError extends Error {
constructor(msg, code) {
super(msg);
this.code = code;
}
}
// Async + JDoc
/** @throws {APIError} */
export async function getData(id) {
if (!id) throw new APIError('Missing ID', 400);
const res = await fetch(`/api/${id}`);
if (!res.ok) throw new APIError('Failed', res.status);
return res.json();
}
```
## Reference & Examples
…Read the whole file at its exact version.
How to install
mdr add hoangnguyen0403/agent-skills-standard/JavaScript Best Practices@sha256:990a75fe88c66945The line at the top of this page pins the label git:20260509.3e36716, 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_l6wiumvkcllu2vyr)
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Versions
The registry has recorded 1 version of this file, committed on May 9, 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 (1626 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
hoangnguyen0403/agent-skills-standard · 583 stars · license MIT · pushed 2026-11-07 · branch develop
API
GET https://markdownregistry.com/api/v1/artifacts/art_l6wiumvkcllu2vyr GET https://markdownregistry.com/api/v1/resolve?ref=hoangnguyen0403/agent-skills-standard/JavaScript Best Practices GET https://markdownregistry.com/api/v1/blob/990a75fe88c669459af0397f7b8b8cb8dcaf51b32bbf90dd343118c3552ec555
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.