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Use when implementing structured logging, setting up Axiom observability, migrating from console.* to a centralized logger, or configuring Vercel Log Drains for log collection in Next.js apps

Psychological principles and implementation patterns for AI chat interfaces that feel natural and engaging. Covers Weber-Fechner timing, beta-distribution delays, character-by-character typing simulation, and model response padding.

CSS and React patterns for building WhatsApp-style chat interfaces with pinned input, bottom-anchored messages, scroll management, and streaming support. Covers the CSSence double-reverse pattern, min-h-0 grid/flex fixes, h-dvh viewport locking, and mobile adaptations.

Use when upgrading Zod 3→4, Vitest 2→4, Tailwind CSS 3→4. Covers non-obvious gotchas that cause runtime failures - things NOT prominently documented.

Use when deploying to Vercel - covers Fluid Compute (timeout issues, 60s bug), vercel.json configuration, maxDuration settings, cron jobs, environment variables (printf gotcha), monorepo setup, Next.js issues, and common build errors

Server-Sent Events (SSE) for real-time progress updates in Next.js/Vercel. TransformStream patterns, client consumption, progress tracking.

DuckDB, MotherDuck cloud analytics, and Parquet file handling for Node.js/TypeScript applications

Use when building Chrome extensions (Manifest V3). Covers floating panel architecture, sidepanel API, storage patterns, message passing, content scripts, SPA navigation detection, context menus, Vitest testing, Playwright E2E, and common pitfalls.

Use when automating browsers with Playwright/Puppeteer, testing Chrome extensions, using Chrome DevTools Protocol (CDP), handling dynamic content/SPAs, or debugging automation issues

Use when deploying applications, choosing deployment platforms, or troubleshooting deployment issues - routes to platform-specific skills (Vercel, Fly.io, Cloudflare)

Use when deploying to Fly.io - covers single volume limitation, monorepo deployment, Dockerfile patterns for Next.js/Python, and common troubleshooting

Use when deploying MkDocs documentation to GitHub Pages with GitHub Actions - covers Python-Markdown gotchas (indentation, footnotes, grid tables), workflow configuration, and systematic markdown fixing

Use when generating PDFs from markdown with Pandoc - covers differences from Python-Markdown, blank line rules, fix scripts for labels/anchors/metadata, and visual testing workflow

Use when building professional installers for desktop applications - covers macOS DMG with app bundles, Windows MSI with WiX, Linux DEB packages, GitHub Actions automation, and SLSA attestations

Use when implementing dependency installation systems - covers bundled portable executables in MSI installers, unified detection/execution code paths, and Windows installer best practices