How do I install the Unbuilt skill?

Run npx skillmds@latest add tomevault-io/unbuilt in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Unbuilt safe to use?

This skill has not completed SkillMD's automated safety review yet. Independent scanners report: SkillSpector: PASS, Skill Scanner: PASS. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Unbuilt?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Unbuilt free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Unbuilt?

tomevault-io (@tomevault-io) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Unbuilt by tomevault-io — Agent Skill

Name: Unbuilt
Author: tomevault-io

Unbuilt

Detect the full technology stack of any website by URL. Returns framework, UI library, bundler, state management, styling, tables, animations, forms, API patterns, monitoring, analytics, and more. Use when a user asks to analyze a website's tech stack, build something similar to an existing app, or understand what technologies a site uses. Use when this capability is needed.

tomevault-io Updated Sep 17, 2026

File contents

unbuilt

Detect the complete technology stack of any website using live code analysis.

When to use

User asks "what tech stack does [website] use?"
User says "build me something like [website]" — analyze it first
User wants to compare tech stacks of different sites
User needs to understand a competitor's technical choices

Prerequisites

Requires Node.js >= 20. Install if not present:

npm install -g @unbuilt/cli

Analyze a website

unbuilt <url> --format agent

Always use --format agent — it returns compact one-line-per-category output optimized for your context window.

Example output:

Framework: Next.js
UI: React
Bundler: Webpack
Styling: Tailwind CSS + PostCSS
State: Zustand
Tables: TanStack Table + TanStack Virtual
Components: Radix UI
Animation: Framer Motion
Router: Next.js Router
Monitoring: Sentry

Alternative output formats

Only use these if the user explicitly asks for more detail:

--json — full structured JSON with confidence scores and matched patterns
No flag — default table output with all categories

Remote analysis

If Playwright fails or takes too long:

unbuilt <url> --remote --format agent

Uses unbuilt.app servers with cached results.

Detection categories

Framework, UI Library, Bundler, Styling, Component Library (Radix, Headless UI, Ant Design), State Management, Tables/Virtualization (TanStack Table, AG Grid, Virtuoso), Forms (React Hook Form, Formik, Zod), Animation (Framer Motion, GSAP, Lottie), API Patterns (GraphQL, tRPC, WebSocket, SSE), HTTP Client, Router, Translations, Dates, Transpiler, Monitoring, Analytics, Platform.

Source: yavorsky/unbuilt.app — distributed by TomeVault.

---name: unbuiltdescription: Detect the full technology stack of any website by URL. Returns framework, UI library, bundler, state management, styling, tables, animations, forms, API patterns, monitoring, analytics, and more. Use when a user asks to analyze a website's tech stack, build something similar to an existing app, or understand what technologies a site uses. Use when this capability is needed.---# unbuiltDetect the complete technology stack of any website using live code analysis.## When to use- User asks "what tech stack does [website] use?"- User says "build me something like [website]" — analyze it first- User wants to compare tech stacks of different sites- User needs to understand a competitor's technical choices## PrerequisitesRequires Node.js >= 20. Install if not present:```bashnpm install -g @unbuilt/cli```## Analyze a website```bashunbuilt <url> --format agent```Always use `--format agent` — it returns compact one-line-per-category output optimized for your context window.Example output:```Framework: Next.jsUI: ReactBundler: WebpackStyling: Tailwind CSS + PostCSSState: ZustandTables: TanStack Table + TanStack VirtualComponents: Radix UIAnimation: Framer MotionRouter: Next.js RouterMonitoring: Sentry```## Alternative output formatsOnly use these if the user explicitly asks for more detail:- `--json` — full structured JSON with confidence scores and matched patterns- No flag — default table output with all categories## Remote analysisIf Playwright fails or takes too long:```bashunbuilt <url> --remote --format agent```Uses unbuilt.app servers with cached results.## Detection categoriesFramework, UI Library, Bundler, Styling, Component Library (Radix, Headless UI, Ant Design), State Management, Tables/Virtualization (TanStack Table, AG Grid, Virtuoso), Forms (React Hook Form, Formik, Zod), Animation (Framer Motion, GSAP, Lottie), API Patterns (GraphQL, tRPC, WebSocket, SSE), HTTP Client, Router, Translations, Dates, Transpiler, Monitoring, Analytics, Platform.---> Source: [yavorsky/unbuilt.app](https://github.com/yavorsky/unbuilt.app) — distributed by [TomeVault](https://tomevault.io).

Frequently asked questions