What is build-system?

A build and test helper that detects whether a project uses npm, Yarn, pnpm, pip, Poetry, Gradle, Maven, Cargo, Go, or Make. It then runs the matching build or test command.

For building projects, running all tests, or running a selected group of tests such as unit tests, based on the files found in the project.

It removes the need to identify the project’s package manager and remember its commands before checking changes.

build-system — Skill for Claude Code by sangrokjung

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.

Any agent

npx skills add sangrokjung/claude-forge --skill build-system

Clone the repo

git clone --depth 1 https://github.com/sangrokjung/claude-forge

Made for: Claude Code.

Or install claude-forge, the plugin that ships this one along with the rest of its 33 skills, 39 commands, 17 agents.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/sangrokjung/claude-forge/build-system/github.svg)](https://agentmods.dev/skills/sangrokjung/claude-forge/build-system)

Your own site

<a href="https://agentmods.dev/skills/sangrokjung/claude-forge/build-system"><img src="https://agentmods.dev/badge/skills/sangrokjung/claude-forge/build-system/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/sangrokjung/claude-forge/build-system"><img src="https://agentmods.dev/badge/skills/sangrokjung/claude-forge/build-system.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 636 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

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.

Model	Per session	Once invoked
Fable 5.1	$0.00050	$0.00636
Opus 5	$0.00025	$0.00318
Sonnet 5	$0.00010	$0.00127
Haiku 4.5	$0.00005	$0.00064

Measured 10d ago against content hash bb30df06d900, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

build-system 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 10d 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.

skills/build-system/SKILL.md · 78 lines

What it actually says

Build System Skill

개요

프로젝트의 빌드 시스템을 자동으로 감지하고 적절한 빌드/테스트 명령어를 실행합니다.

지원 빌드 시스템

빌드 시스템	감지 파일	빌드 명령어	테스트 명령어
npm	`package.json`	`npm run build`	`npm test`
yarn	`yarn.lock`	`yarn build`	`yarn test`
pnpm	`pnpm-lock.yaml`	`pnpm build`	`pnpm test`
Python (pip)	`requirements.txt`	`pip install -r requirements.txt`	`pytest`
Python (poetry)	`pyproject.toml`	`poetry install`	`poetry run pytest`
Gradle	`build.gradle`	`./gradlew build`	`./gradlew test`
Maven	`pom.xml`	`mvn package`	`mvn test`
Cargo	`Cargo.toml`	`cargo build`	`cargo test`
Go	`go.mod`	`go build ./...`	`go test ./...`
Make	`Makefile`	`make`	`make test`

사용법

프로젝트 루트에서 빌드 시스템을 자동 감지하고 실행합니다.

빌드

# 자동 감지 후 빌드
/build

# 특정 명령어로 빌드
/build --cmd="npm run build:prod"

테스트

# 자동 감지 후 테스트
/test

# 특정 테스트만 실행
/test --filter="unit"

감지 우선순위

package-lock.json → npm
yarn.lock → yarn
pnpm-lock.yaml → pnpm
pyproject.toml → poetry
requirements.txt → pip
Cargo.toml → cargo
go.mod → go
build.gradle → gradle
pom.xml → maven
Makefile → make

커스터마이징

프로젝트별로 .claude/config.json에서 빌드 명령어를 오버라이드할 수 있습니다:

{
  "build": {
    "command": "npm run build:custom",
    "test_command": "npm run test:ci"
  }
}

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.

10d ago First seen · 78 lines · 50 tokens per session scan A bb30df06d900

Subscribe to this mod's changes

build-system is a skill published in the GitHub repository sangrokjung/claude-forge (835 stars, last pushed 6d ago), licensed MIT. It adds 50 tokens to every session and 636 once invoked, about $0.0003 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.

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