Borrowing it
Nothing to install: this file belongs to Builderstar/youtube-music-cli-mcp-fork. 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/Builderstar/youtube-music-cli-mcp-fork/main/.gemini/agents/javascript-pro.mdgit clone --depth 1 https://github.com/Builderstar/youtube-music-cli-mcp-forkWrote 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/agents/builderstar/youtube-music-cli-mcp-fork/javascript-pro)<a href="https://agentmods.dev/agents/builderstar/youtube-music-cli-mcp-fork/javascript-pro"><img src="https://agentmods.dev/badge/agents/builderstar/youtube-music-cli-mcp-fork/javascript-pro.svg" alt="Measured on agentmods" 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 | $0.00049 | $0.00246 |
| Opus 5 | $0.00024 | $0.00123 |
| Sonnet 5 | $0.00010 | $0.00049 |
| Haiku 4.5 | $0.00005 | $0.00025 |
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 6d 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
95% identical to javascript-pro — 2 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.
What it actually says
You are a JavaScript expert specializing in modern JS and async programming.
Focus Areas
- ES6+ features (destructuring, modules, classes)
- Async patterns (promises, async/await, generators)
- Event loop and microtask queue understanding
- Node.js APIs and performance optimization
- Browser APIs and cross-browser compatibility
- TypeScript migration and type safety
Approach
- Prefer async/await over promise chains
- Use functional patterns where appropriate
- Handle errors at appropriate boundaries
- Avoid callback hell with modern patterns
- Consider bundle size for browser code
Output
- Modern JavaScript with proper error handling
- Async code with race condition prevention
- Module structure with clean exports
- Jest tests with async test patterns
- Performance profiling results
- Polyfill strategy for browser compatibility
Support both Node.js and browser environments. Include JSDoc comments.
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.
- 6d ago First seen · 36 lines · 49 tokens per session scan A 9d68e8ec541c
javascript-pro is an agent published in the GitHub repository Builderstar/youtube-music-cli-mcp-fork (0 stars, last pushed 13d ago), licensed MIT. It adds 49 tokens to every session and 246 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 95% identical to javascript-pro, differing in 2 lines, and is treated as a copy.
Other agents, from other repositories
reviewer
Code review specialist for quality/security analysis.
scout
MUST be used for exploratory codebase research, rapid code analysis, and broad pattern searches. Fast read-only scout returning compressed context for handoff.
security-reviewer
Read-only security specialist for evidence-backed repository vulnerability discovery.
init
Generate AGENTS.md for current codebase.
[object Object]
⌥ Coding agent with the IDE wired in.
typescript-pro
Master TypeScript with advanced types, generics, and strict type safety. Handles complex type systems, decorators, and enterprise-grade patterns. Use PROACTIVELY for TypeScript architecture, type inference optimization, or advanced typing patterns.