당신의 아이디어가 이미 그것을 투자하기 전에 구축되었는지 확인하는 Claude Code의 기술. 그것은 풍경을 검색, 존재하는 클러스터, 이전 예술에 대한 당신의 각도 벤치 마크, 그리고 직접 verdict를 전달: 빌드, 포크, 기여, 거기에 무슨을 사용, 또는 다른 사람이 포기 왜 조사.

설치

Claude 코드

Claude Code의 기술 디렉토리에 직접 복제:

또는 이미이 repo 복제 된 경우 기술 파일을 수동으로 복사하십시오.

오픈코드

OpenCode의 기술 디렉토리에 직접 복제:

또는 이미이 repo 복제 된 경우 기술 파일을 수동으로 복사하십시오.

참고 : OpenCode는 호환성을 위해 ~/.claude/skills/을 스캔하므로 단일 클론을 ~/.claude/skills/who-built-this-before-me/]로 두 도구 모두 작동합니다.

사용법

Claude 코드

오픈코드

또는 단지 도구에서 직접 생각을 설명합니다 - “나는 빌드하고 싶은 문구에 대한 기술 트리거 …”, “나는 생각의 만들기 …”, “나는 내가 X를 구축하고 있습니다 …”, 또는 “이 이미 있습니다 …”:

당신이 돌아가는 것

이 단면도를 가진 1개의 스크린 보고:

• ** 아이디어, restated ** - 한 문장에 스트립 된 피치, 그래서 당신은 검색이 올바른 일을 타겟팅 할 수 있습니다.

who-built-this-before-me

A skill for Claude Code that checks whether your idea has already been built before you invest time in it. It searches the landscape, clusters what exists, benchmarks your angle against prior art, and delivers a direct verdict: build, fork, contribute, use what’s out there, or investigate why someone else gave up.

Installation

Claude Code

Clone directly into Claude Code’s skills directory:

mkdir -p ~/.claude/skills
git clone https://github.com/iagochavarry/who-built-this-before-me.git ~/.claude/skills/who-built-this-before-me

Or copy the skill file manually if you already have this repo cloned:

mkdir -p ~/.claude/skills/who-built-this-before-me
cp SKILL.md ~/.claude/skills/who-built-this-before-me/

OpenCode

Clone directly into OpenCode’s skills directory:

mkdir -p ~/.config/opencode/skills
git clone https://github.com/iagochavarry/who-built-this-before-me.git ~/.config/opencode/skills/who-built-this-before-me

Or copy the skill file manually if you already have this repo cloned:

mkdir -p ~/.config/opencode/skills/who-built-this-before-me
cp SKILL.md ~/.config/opencode/skills/who-built-this-before-me/

Note: OpenCode also scans ~/.claude/skills/ for compatibility, so a single clone into ~/.claude/skills/who-built-this-before-me/ works for both tools.

Usage

Claude Code

/who-built-this-before-me

I'm thinking of building [your idea here]

OpenCode

/who-built-this-before-me

I'm thinking of building [your idea here]

Or just describe the idea directly in either tool — the skill triggers on phrases like “I want to build…”, “I’m thinking of making…”, “should I build X…”, or “is there already a…”:

I want to build a CLI that auto-generates database migrations from OpenAPI schemas. Has anyone done this?

What you get back

A one-screen report with these sections:

• The idea, restated — your pitch stripped to one sentence, so you can confirm the search is targeting the right thing.
• The landscape — a table of direct matches, adjacent solutions, partial solutions, and abandoned projects (max 3 per bucket).
• Standard patterns — what shows up repeatedly across the matches: architecture, libraries, pricing, naming conventions. The default playbook you’d be competing with or building on.
• Differentiator analysis — an honest paragraph on whether your angle is actually different, or whether the novelty is manufactured.
• Verdict — one of: Build it, Fork X, Contribute to Y, Use Z, or Investigate first, plus the concrete next step.

Sharpening the input

The more specific your pitch, the sharper the search. Compare:

Vague — the skill will ask one clarifying question before searching:

/who-built-this-before-me

I want to build a dev tool.

Specific — the skill goes straight to searching:

/who-built-this-before-me