ClaudSkills / Science & Research / science-misc

Audit Bundle Size

Q: What is a Claude Code skill and how does the Audit Bundle Size skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Audit Bundle Size is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Science & Research category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Science & Research · Sub-category: science-misc · Last updated: 2026-06-17

lang:javascript type:audit

Analyse and shrink JavaScript bundle size for any web app. Auto-detects bundler (Vite, Webpack, Rollup, esbuild, Next.js, Turbopack). Runs a production build with bundle analysis, identifies the largest chunks, duplicate dependencies, non-tree-shakeable imports, and missing code-splitting or lazy-load boundaries. Researches current best practices via Firecrawl and Context7. Maps every finding to a specific file and import with before/after size estimates. Generic across any framework. Use when asked to "reduce bundle size", "analyse bundle", "tree shaking", "lazy loading", "code splitting", "slow initial load", "large JS", "chunk size", "build performance", "LCP caused by JS", "why is the bundle so big", or "first load JS too large".

From the source SKILL.md

Every kilobyte of JavaScript the browser must download, parse, and compile before showing anything costs real users real time. A large initial bundle is the #1 avoidable cause of slow LCP and poor Core Web Vitals. This skill finds exactly what is bloating it and tells you how to fix each item.

What this skill does

Audit Bundle Size is a community-contributed Claude Code skill in the science-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/audit-bundle-size/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when asked to "reduce bundle size", "analyse bundle", "tree shaking", "lazy loading", "code splitting", "slow initial load", "large JS", "chunk size", "build performance", "LCP caused by JS", "why is the bundle so big", or "first load JS too large".

Who uses this skill

The Audit Bundle Size Claude Code skill is built for researchers, data scientists, academics, and analysts working with complex data and scientific literature. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 119,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/audit-bundle-size
curl -L https://claudskills.com/skills/audit-bundle-size/SKILL.md \
  -o ~/.claude/skills/audit-bundle-size/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/audit-bundle-size/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/audit-bundle-size/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\audit-bundle-size\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Audit Bundle Size Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/audit-bundle-size/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Audit Bundle Size skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Audit Bundle Size skill?

Use Audit Bundle Size when your Claude Code task falls under the Science & Research category — specifically in the science misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Audit Bundle Size" or describe the task and let Claude pick). Browse related skills at /category/science/.

What is a Claude Code skill and how does the Audit Bundle Size skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Audit Bundle Size is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Science & Research category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/kensaurus/cursor-kenji/blob/HEAD/skills/audit-bundle-size/SKILL.md
License: MIT
Author: kensaurus
Website: https://github.com/kensaurus/cursor-kenji

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

kensaurus. (2026). Audit Bundle Size [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/audit-bundle-size/

BibTeX

@misc{audit-bundle-size-2026,
  author    = {kensaurus},
  title     = {Audit Bundle Size [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/audit-bundle-size/}
}

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Badge

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