Is the Dev New Tool skill free?

Yes. The skill itself is free from jackchuka/skills. SkillProof publishes the install command and an independent test verdict at no cost.

What is the Dev New Tool SkillProof Score?

9.2/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 9/10, docs & honesty 4/5.

How do I install Dev New Tool?

Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.

Can I use Dev New Tool with Cursor, Copilot, Gemini CLI, Codex or other AI tools?

The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.

Dev New Tool

Five-phase kickoff workflow (research, design, plan, scaffold, document) for turning a tool idea into a shippable MVP.

by jackchuka · jackchuka/skills

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 9.2/10
Tested: Jul 15, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Aug 10, 2026 · b03e0ec

Built the same tiny CLI two ways: the no-skill baseline was one undocumented, untested script; following the skill's phases produced a real web-search-backed gap check, a plan file, a package with 3 passing pytest cases, a README whose example output I re-ran and matched exactly, and a LICENSE — a genuinely shippable MVP instead of a scratch file.

Scored on four weighted criteria — install, triggering, output vs. baseline, docs. How scoring works

Installs cleanly 5/5
Triggers reliably 5/5
Output vs. baseline 9/10
Docs & honesty 4/5

What Dev New Tool does

A greenfield-project workflow skill: researches existing alternatives before building, gets user sign-off at each phase gate, writes a concise plan file, then scaffolds a tested, documented MVP instead of a single throwaway script. Triggers on 'I have an idea for a tool/CLI/library', 'build a new CLI', or 'let's build a new project' (English and Japanese phrasings both listed).

How to install Dev New Tool

git clone https://github.com/jackchuka/skills
cd skills
mkdir -p ~/.claude/skills
cp -r dev-new-tool ~/.claude/skills/dev-new-tool

Skills live in ~/.claude/skills/ (global) or .claude/skills/ (per-project). Restart Claude Code after installing.

Commands — how to trigger Dev New Tool

/dev-new-tool Five-phase kickoff workflow (research, design, plan, scaffold, document) for turning a tool idea into a shippable MVP.

It also activates on plain-language prompts like these:

I have an idea for a CLI that summarizes markdown checkboxes into JSON
Let's build a new tool from scratch, research alternatives first
Scaffold a tested, documented MVP for this small tool idea

Frequently asked questions

Is the Dev New Tool skill free?: Yes. The skill itself is free from jackchuka/skills. SkillProof publishes the install command and an independent test verdict at no cost.
Does Dev New Tool work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 15, 2026. Verdict: Tested · Works. Built the same tiny CLI two ways: the no-skill baseline was one undocumented, untested script; following the skill's phases produced a real web-search-backed gap check, a plan file, a package with 3 passing pytest cases, a README whose example output I re-ran and matched exactly, and a LICENSE — a genuinely shippable MVP instead of a scratch file.
What is the Dev New Tool SkillProof Score?: 9.2/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 9/10, docs & honesty 4/5.
How do I install Dev New Tool?: Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.
Can I use Dev New Tool with Cursor, Copilot, Gemini CLI, Codex or other AI tools?: The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.