javascript-pro SKILL.md skillA
javascript-pro from zacklecon/claude-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add zacklecon/claude-skills/javascript-pro@v1.0.0Pins v1.0.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- zacklecon/claude-skills
- Path
skills/javascript-pro/SKILL.md- Versions recorded
- 5
- Latest version
- v1.0.0, committed Feb 2, 2026
- First version recorded
- Dec 15, 2025
- Size
- 3,652 bytes
- Repository stars
- 3
- License
- MIT
Use when building JavaScript applications with modern ES2023+ features, async patterns, or Node.js development. Invoke for vanilla JavaScript, browser APIs, performance optimization, module systems.
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 Pro Senior JavaScript developer with 10+ years mastering modern ES2023+ features, asynchronous patterns, and full-stack JavaScript development. ## Role Definition You are a senior JavaScript engineer with 10+ years of experience. You specialize in modern ES2023+ JavaScript, Node.js 20+, asynchronous programming, functional patterns, and performance optimization. You build clean, maintainable code following modern best practices. ## When to Use This Skill - Building vanilla JavaScript applications - Implementing async/await patterns and Promise handling - Working with modern module systems (ESM/CJS) - Optimizing browser performance and memory usage - Developing Node.js backend services - Implementing Web Workers, Service Workers, or browser APIs ## Core Workflow 1. **Analyze requirements** - Review package.json, module system, Node version, browser targets 2. **Design architecture** - Plan modules, async flows, error handling strategies 3. **Implement** - Write ES2023+ code with proper patterns and optimizations 4. **Optimize** - Profile performance, reduce bundle size, prevent memory leaks …
Read the whole file at its exact version.
How to install
mdr add zacklecon/claude-skills/javascript-pro@sha256:579cffe2ade5443dThe line at the top of this page pins the label v1.0.0, 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_54ms5w5zba45menx)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Dec 15, 2025 and Feb 2, 2026, about one every 12 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0.0 latest | 2026-02-02 | 7bbd06a | 3,652 B | A | view · diff |
| v1.0.0 | 2026-02-02 | 5bf7075 | 3,912 B | A | view · diff |
| git:20260119.97b6026 | 2026-01-19 | 97b6026 | 3,795 B | A | view · diff |
| git:20251221.830153d | 2025-12-21 | 830153d | 3,865 B | A | view · diff |
| git:20251215.f797105 | 2025-12-15 | f797105 | 3,862 B | A | view |
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 (3652 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
zacklecon/claude-skills · 3 stars · license MIT · pushed 2026-10-13 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_54ms5w5zba45menx GET https://markdownregistry.com/api/v1/resolve?ref=zacklecon/claude-skills/javascript-pro GET https://markdownregistry.com/api/v1/blob/579cffe2ade5443d5088151eed7675877b232570f28976d1d47891d257387a13
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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