Borrowing it
Nothing to install: this file belongs to dirien/yet-another-agent-harness. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/dirien/yet-another-agent-harness/main/.claude/skills/javascript-pro/SKILL.mdgit clone --depth 1 https://github.com/dirien/yet-another-agent-harnessWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/dirien/yet-another-agent-harness/javascript-pro)<a href="https://agentmods.dev/skills/dirien/yet-another-agent-harness/javascript-pro"><img src="https://agentmods.dev/badge/skills/dirien/yet-another-agent-harness/javascript-pro/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/dirien/yet-another-agent-harness/javascript-pro"><img src="https://agentmods.dev/badge/skills/dirien/yet-another-agent-harness/javascript-pro.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00084 | $0.01123 |
| Opus 5.5 | $0.00034 | $0.00449 |
| Sonnet 5.5 | $0.00017 | $0.00225 |
| Haiku 4.5 | $0.00008 | $0.00112 |
Grade A, and why
javascript-pro scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
This is a copy
97% identical to javascript-pro — 5 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 133 lines — stays where its author put it; the contents beside it link to each section on GitHub.
JavaScript Pro
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
- Analyze requirements — Review
package.json, module system, Node version, browser targets; confirm.js/.mjs/.cjsconventions - Design architecture — Plan modules, async flows, and error handling strategies
- Implement — Write ES2023+ code with proper patterns and optimisations
- Validate — Run linter (
eslint --fix); if linter fails, fix all reported issues and re-run before proceeding. Check for memory leaks with DevTools or--inspect, verify bundle size; if leaks are found, resolve them before continuing - Test — Write comprehensive tests with Jest achieving 85%+ coverage; if coverage falls short, add missing cases and re-run. Confirm no unhandled Promise rejections
Reference Guide
Load detailed guidance based on context:
| Topic | Reference | Load When |
|---|---|---|
| Modern Syntax | references/modern-syntax.md |
ES2023+ features, optional chaining, private fields |
| Async Patterns | references/async-patterns.md |
Promises, async/await, error handling, event loop |
| Modules | references/modules.md |
ESM vs CJS, dynamic imports, package.json exports |
| Browser APIs | references/browser-apis.md |
Fetch, Web Workers, Storage, IntersectionObserver |
| Node Essentials | references/node-essentials.md |
fs/promises, streams, EventEmitter, worker threads |
Constraints
MUST DO
- Use ES2023+ features exclusively
- Use
X | nullorX | undefinedpatterns - Use optional chaining (
?.) and nullish coalescing (??) - Use async/await for all asynchronous operations
- Use ESM (
import/export) for new projects - Implement proper error handling with try/catch
- Add JSDoc comments for complex functions
- Follow functional programming principles
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 133 lines · 84 tokens per session scan A 52eb230ceb32
javascript-pro is a skill published in the GitHub repository dirien/yet-another-agent-harness (20 stars, last pushed 4mo ago), licensed MIT. It adds 84 tokens to every session and 1,123 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 97% identical to javascript-pro, differing in 5 lines, and is treated as a copy.
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