skills

Extract evidence from public Bilibili and YouTube videos for accurate summaries, analysis, research, or downstream article planning. Use when a request includes a bilibili.com, b23.tv, youtube.com, or youtu.be video URL, a Bilibili BV identifier, or asks Codex to inspect what a Bilibili or YouTube video actually says. Collect public metadata, tags, comments, available subtitles, low-resolution media, audio, and contact sheets; use local speech-to-text when subtitles are unavailable.

Draft, research, rewrite, and review technical or general blog posts, articles, and essays. Use when you needs to create new content, improve an existing draft, adapt writing for a specific audience, strengthen evidence and reasoning, preserve an author's voice, or prepare a post for publication.

Optimize web performance through code-level, locally actionable strategies. Focuses on asset loading, JavaScript execution, rendering stability, and framework-level optimizations that developers can implement in their local codebase without touching infrastructure or deployment. Triggered when the user asks to optimize website speed, fix Core Web Vitals, improve page load time / interactivity / visual stability, or audit a codebase for performance issues.

Design and implement high-quality web interfaces by synthesizing proven design philosophies from Dieter Rams, Brad Frost (Atomic Design), Google Material Design, and modern web best practices. Triggered when the user asks to design a web page, UI component, design system, layout, or when asked to review/improve existing web design.

Use when drafting, rewriting, or reviewing a product definition or product design document — the artifact that states what a product is, what problem it solves, who it is for, and its core concepts and information structure. Applies when the user asks for a product definition, product design doc, or "PRD-lite", or pushes back that a draft reads like a technical proposal, RFC, or data-model spec. Enforces user-perspective wording, information-structure over schemas, problem-before-solution ordering, and mental-model-first concept writing.