javascript-pro

A coding assistant for modern JavaScript, the language used in browsers and many server applications through Node.js. It covers asynchronous code, browser compatibility, modules, TypeScript migration, and performance.

In plain words
What is it for?
Use it to write or debug async/await and promise code, prevent race conditions, organize modules, improve browser or Node.js code, and add Jest tests.
Why use it?
It helps prevent confusing timing bugs, unhandled errors, compatibility problems, and poorly structured JavaScript.

Agent for Claude Code

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add agents/echovic/blade-code/javascript-pro
Clone the repo
git clone --depth 1 https://github.com/echoVic/blade-code

Made for: Claude Code.

Per session 49 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 247 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00049 $0.00247
Opus 5 $0.00024 $0.00123
Sonnet 5 $0.00010 $0.00049
Haiku 4.5 $0.00005 $0.00025

Measured yesterday against content hash c8b65214462d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

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 yesterday.

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.

Origin

Copies of this mod

2 near-identical copies found in the catalogue:

.claude/agents/javascript-pro.md · 36 lines

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

  1. Prefer async/await over promise chains
  2. Use functional patterns where appropriate
  3. Handle errors at appropriate boundaries
  4. Avoid callback hell with modern patterns
  5. 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.

Changes

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.

  1. yesterday First seen · 36 lines · 49 tokens per session scan A c8b65214462d

Subscribe to this mod's changes

javascript-pro is an agent published in the GitHub repository echoVic/blade-code (177 stars, last pushed yesterday), licensed MIT. It adds 49 tokens to every session and 247 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.