check-library-build

check-library-build is a command for Claude Code from TheBeardedBearSAS/claude-craft. It costs 18 tokens per session (1,280 once invoked), scanned B, original, MIT.

A build audit for a Vite library, checking its generated JavaScript files, TypeScript declaration files, and package metadata. Vite is a tool for building frontend projects, while a library is code intended for other projects to install and use.

In plain words
What is it for?
Use it to inspect library configuration, build output, public types, external dependencies, and support for both ESM and CommonJS consumers.
Why use it?
It catches packaging mistakes that can make a published library fail for JavaScript or TypeScript users.

Command for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter.

Part of the claude-craft plugin — 56 skills, 94 commands, 47 agents, 5 hooks shipped together

Good fit Use it to inspect library configuration, build output, public types, external dependencies, and support for both ESM and CommonJS consumers.

Compare 6 commands from other repositories ↓
Install with agentmods
npx agentmods add commands/thebeardedbearsas/claude-craft/check-library-build
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.

Clone the repo
git clone --depth 1 https://github.com/TheBeardedBearSAS/claude-craft

Made for: Claude Code.

Or install claude-craft, the plugin that ships this one along with the rest of its 56 skills, 94 commands, 47 agents, 5 hooks.

Wrote 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.

agentmods badge for check-library-build

README.md
[![agentmods](https://agentmods.dev/badge/commands/thebeardedbearsas/claude-craft/check-library-build/github.svg)](https://agentmods.dev/commands/thebeardedbearsas/claude-craft/check-library-build)
Your own site
<a href="https://agentmods.dev/commands/thebeardedbearsas/claude-craft/check-library-build"><img src="https://agentmods.dev/badge/commands/thebeardedbearsas/claude-craft/check-library-build/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.

agentmods 80×15 button for check-library-build

Your own site · 80×15
<a href="https://agentmods.dev/commands/thebeardedbearsas/claude-craft/check-library-build"><img src="https://agentmods.dev/badge/commands/thebeardedbearsas/claude-craft/check-library-build.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 18 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,280 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00018 $0.01280
Opus 5 $0.00009 $0.00640
Sonnet 5 $0.00004 $0.00256
Haiku 4.5 $0.00002 $0.00128

Measured 5d ago against content hash 2dccedd713cf, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade B, and why

check-library-build scanned grade B with 1 finding 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 5d 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.

Strips warnings and disclaimersmediumAnti-refusal

Omitting safety caveats hides risk from the user and is a common jailbreak preamble.

[ ] npm run build completes without warnings
.claude/commands/vite/check-library-build.md · 141 lines

How it starts

The opening of the file, as written. The whole thing — 141 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Vite Library Build Audit

You are an expert library packaging auditor. Validate that a Vite library build (build.lib) produces correct, consumable output with accurate type declarations.

Scope framework-agnostic uniquement. Pour Vite en tant que dev-server React/Vue/Angular/Svelte, voir le tooling.md de ce stack.

MISSION

Run the library build, inspect dist/, and verify that JS output, .d.ts declarations, and package.json metadata are all consistent and consumable by both ESM and CJS consumers.

AUDIT AREAS

1. Config & Architecture Vite (30 points)

[ ] build.lib.entry points to a single, deliberate public entry (src/index.ts)
[ ] build.lib.formats includes both 'es' and 'cjs' unless ESM-only is an explicit decision
[ ] rollupOptions.external lists all peer dependencies (not bundled into the library)
[ ] vite-plugin-dts configured with include matching the actual source tree
[ ] No accidental bundling of devDependencies into the library output

2. TypeScript & Qualité (20 points)

[ ] tsconfig.json declaration-compatible (composite/declaration settings don't conflict with vite-plugin-dts)
[ ] Public API fully typed — no `any` leaking into generated .d.ts
[ ] vite-plugin-dts rollupTypes: true used when a single bundled .d.ts is desired
[ ] Re-exported types (export type { ... }) match runtime exports 1:1

3. Tests (25 points)

[ ] A build smoke test imports the compiled dist/ output (not just src/) at least once
[ ] Both ESM and CJS entry points tested if both are published
[ ] Type-level test (e.g. tsd or expect-type) validates the shape of the generated .d.ts
[ ] Regression test for tree-shaking: importing one named export does not pull in unrelated code

4. Build Output & Performance (25 points)

[ ] npm run build completes without warnings
[ ] dist/ contains exactly the files declared in package.json "files"
[ ] .d.ts files generated for every JS/TS entry point, no missing or stale declarations
[ ] package.json exports map resolves correctly for both "import" and "require" consumers
[ ] Bundle size reported and within the declared budget (no unexpected dependency inlined)

Read the full file on GitHub · 141 lines

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. 5d ago First seen · 141 lines · 18 tokens per session scan B 2dccedd713cf

Subscribe to this mod's changes

check-library-build is a command published in the GitHub repository TheBeardedBearSAS/claude-craft (105 stars, last pushed 6d ago), licensed MIT. It adds 18 tokens to every session and 1,280 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it B with 1 finding (strips warnings and disclaimers). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.