Summary of "【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

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.

The five highlighted skills

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.
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
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
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)
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

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.

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

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.

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

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.

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.