Is the Dev Ones App skill free?

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

What is the Dev Ones App SkillProof Score?

8.8/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 7/10, docs & honesty 5/5.

How do I install Dev Ones App?

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 Ones App 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 Ones App

Spec-backed workflow for building and packaging ONES Apps (.opkx) via the ones CLI.

by ONES-com · ONES-com/agent-skills

Works with setup

Install — copy the command Download source ↗

Test report

Verdict: Works with setup
Score: 8.8/10
Tested: Jul 15, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Aug 10, 2026 · c6a1d04

The evidence-first discipline is real: told to design a webhook-configurable settings page, it refused to invent manifest fields or event names and instead planned to fetch `.ones/ones-app-specs` first — but that spec directory only exists after `ones login` against a real ONES account, so the skill can't complete a single task in an unauthenticated sandbox.

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 7/10
Docs & honesty 5/5

What Dev Ones App does

Guides an agent through evaluating, designing, implementing, and delivering ONES Apps (ONES Plugin/.opkx), mapping every requirement to local ONES App spec evidence (OpenAPI, Hosted API, Events, Extensions, Web SDK, manifest) instead of guessing. Triggers on ONES App feasibility, capability-mapping, and build/package requests; real use requires installing the `ones` CLI and authenticating against a live ONES account/project to fetch `.ones/ones-app-specs` before any capability claim can be made.

How to install Dev Ones App

git clone https://github.com/ONES-com/agent-skills
cd agent-skills
mkdir -p ~/.claude/skills
cp -r dev-ones-app ~/.claude/skills/dev-ones-app

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

Commands — how to trigger Dev Ones App

/dev-ones-app Spec-backed workflow for building and packaging ONES Apps (.opkx) via the ones CLI.

It also activates on plain-language prompts like these:

Build a ONES App that adds a webhook settings page for issue creation
Help me package a ONES plugin using the opkx spec and Web SDK
Check whether ONES Apps can call an external webhook when a ticket closes

Frequently asked questions

Is the Dev Ones App skill free?: Yes. The skill itself is free from ONES-com/agent-skills. SkillProof publishes the install command and an independent test verdict at no cost.
Does Dev Ones App work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 15, 2026. Verdict: Works with setup. The evidence-first discipline is real: told to design a webhook-configurable settings page, it refused to invent manifest fields or event names and instead planned to fetch `.ones/ones-app-specs` first — but that spec directory only exists after `ones login` against a real ONES account, so the skill can't complete a single task in an unauthenticated sandbox.
What is the Dev Ones App SkillProof Score?: 8.8/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 7/10, docs & honesty 5/5.
How do I install Dev Ones App?: 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 Ones App 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.