【チート級】この5つのClaude Code Skillsは個人開発のチートスキルです【Claude Code】

Purpose and context

The presenter is an engineer / indie developer who uses Claude Code Skills extensively for personal web service development (reports ~¥50,000/month). The video demonstrates five “cheat-level” Claude Code skills that accelerate product development, UI/design, code quality checks, video generation, and funnel/marketing analysis.

Main tooling referenced:

• Claude Code (skills system) and the skills.sh public directory
• Skill Creator (for building custom skills)
• Demo technologies: React / Next.js, Remotion, JSZip, Stripe, Google Analytics 4, Postgres/Supabase (inferred), Tailwind/CSS/HTML

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How skills are installed and used (workflow)

• Install a skill by copy/pasting a command into the Claude Code environment; choose project-scoped or global install.
• Invoke installed skills with slash commands (for example, /skills or /[skill-name]) inside Claude. Some skills auto-trigger, others can be force-invoked.
• Typical demo flow: install a skill, run it against a real project, review outputs, and edit code based on recommendations.

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The five highlighted skills

1. Basel Find Skills

   • Purpose: search the skills.sh registry to discover appropriate skills for a task (e.g., “skills for improving UI/UX”).
   • Demo: used to locate other relevant skills such as UIUXProMax.

2. UIUXProMax (UI Pro Max)

   • Purpose: extract a UI/UX/design system from a target website by pasting a page URL, then generate reusable assets, HTML/CSS/Tailwind samples, and a UI review.
   • Features:
     • Scrapes typography, styles, and layout
     • Produces a small design system and review checks
   • Demo notes:
     • Pasted a dashboard/YouTube-like URL and generated a dashboard analytics page (HTML/CSS) in ~5 minutes
     • Recommendation: adapt any generated designs to avoid copyright issues

3. Basel React Best Practices (React / Next.js checker)

   • Purpose: analyze a React / Next.js project and flag deviations from best practices: data fetching, bundle size, streaming usage, server/client component patterns, auth checks, memoization, etc.
   • Key checks explained:
     • Async/parallel data fetching (use Promise.all to avoid waterfall loads)
     • Streaming/suspense support detection
     • Bundle-size optimization (flags heavy top-level imports such as JSZip; recommends dynamic import / next/dynamic)
     • Missing server-action authentication checks and unnecessary recalculations (memoize where appropriate)
   • Demo notes:
     • Scanned the presenter’s thumbnail project and fixed a top-level JSZip import to a dynamic import to reduce client bundle size and improve load performance

4. Remotion Best Practices

   • Purpose: generate videos programmatically using Remotion with best-practice patterns.
   • Features:
     • Templated video projects (HTML/CSS)
     • Insert images, text, speech bubbles, voiceover, AI avatars
     • Render output files from templates
   • Demo notes:
     • Created a ~20–30 second intro video for the thumbnail service, previewed and edited templates, then rendered to an output directory
     • Suggested use cases: app intros, short marketing clips (caution: mass-produced content can trigger platform bans)

5. Funnel analysis + Black Methodology (conversion optimization)

   • Purpose: funnel analysis skill (custom or from skills.sh) that connects to Google Analytics 4 and computes funnel drop-off rates across steps (landing → sign-up → generate → pay), then generates hypotheses to reduce drop-off and increase conversions.
   • Features:
     • Time-range analysis and exclusion filters (e.g., exclude social/blog traffic)
     • Produces percentages for each funnel step and suggests optimizations
   • Demo notes:
     • Ran a 2-week funnel: found ~31.9% drop between landing and sign-up, ~88.7% first-generation conversion, and ~7.6% first-payment conversion
     • Suggested optimizations: upsell timing, price anchoring, increasing mid-tier uptake and other hypotheses to double revenue

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Skill Creator (building custom skills)

Demonstrated creating custom skills that combine APIs and workflows to automate business processes:

• Stripe sales tally (pull Stripe sales and output in Markdown)
• Tax-return / accounting helper (aggregate Stripe revenue, upload receipts/spreadsheets, compute expense entries — final check with an accountant advised)
• Social-post-suggestion skills (collect viral posts as templates)

Emphasis: Skill Creator lets you combine APIs and automation to address custom needs and streamline operations.

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Other skills / mentions

• Postgres / Supabase best-practices skill (data schema optimization, RLS, security checks)
• Skills for Expo (mobile app) and other ecosystems
• Black Methodology = conversion rate optimization (CRO) skillset available on skills.sh

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Business impact and commentary

• Presenter reports tangible business uplift: monthly revenue increased from ~¥30k MRR to >¥50k (including one-time fees) after applying skill-driven improvements.
• Argument: Claude Code Skills democratize advanced product/marketing/engineering knowledge — acting like “pair programming” with expert engineers and enabling non-experts to implement best practices.
• Broader opinion: automation will displace many routine jobs; the presenter recommends building AI-powered products/ventures to stay competitive.

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Practical guides and tutorials included in the video

• How to install a skill globally vs project-scoped
• Using Find Skills to search skills.sh
• Run UIUXProMax on a URL and generate HTML/CSS/Tailwind output
• Run a React/Next.js best-practices scan, interpret results, and fix a concrete issue (dynamic import of JSZip)
• Create and render a Remotion video from a template
• Execute a funnel analysis with GA4 data, interpret conversion metrics, and apply CRO hypotheses (Black Methodology)
• Quick demo of Skill Creator to compose a Stripe-sales → tax reporting flow

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Notes about transcript accuracy

Some auto-generated terms may be mis-transcribed. Examples:

• “JSIP” likely JSZip
• “NextChase/NextChase” = Next.js
• “Sparse” likely Supabase
• “Basel” may refer to a core engineering group or the family of skills on skills.sh

The summary focuses on inferred correct technical terms and intent where obvious.

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Main speaker and sources

• Video presenter: an unnamed channel host (engineer, indie developer / AI coder) who demonstrates skills on his own thumbnail-generation web service and shares personal revenue metrics.
• Tools & sources referenced: Claude Code Skills (Claude), skills.sh, UIUXProMax, Basel React Best Practices, Remotion Best Practices, Funnel analysis (Black Methodology), Skill Creator, Next.js/React, Remotion, JSZip, Stripe, Google Analytics 4, Postgres/Supabase (inferred), Tailwind/CSS/HTML.