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Debugging with print statements, the same pit three times.
Errors attributed on the first pass — you review, not rework.
212 skills on this line
Guide contributors through the complete TYPO3 Core contribution workflow from account setup to patch submission for both code and documentation contributions. Trigger when: working with TYPO3 Forge issues (forge.typo3.org/issues/*), preparing patches for TYPO3 Core, contributing to TYPO3 (code or documentation), submitting patches to Gerrit (review.typo3.org) or GitHub PRs (TYPO3-Documentation/*), fixing TYPO3 bugs, managing WIP state, or debugging CI failures. Covers: Account setup, environment configuration with DDEV, commit message formatting, Gerrit review workflow, GitHub PR workflow for documentation, WIP state management (command-line and web UI), CI/CD debugging (CGL, PHPStan, unit tests), troubleshooting (60+ scenarios), code quality enforcement, and systematic patch submission for both code and documentation repositories.
Automate DDEV environment setup for TYPO3 extension development. Use when setting up local development environment, configuring DDEV for TYPO3 extensions, or creating multi-version TYPO3 testing environments. Covers: DDEV configuration generation, TYPO3 11.5/12.4/13.4 LTS installation, custom DDEV commands, Apache vhost setup, Docker volume management, and .gitignore best practices (avoid double-ignore anti-pattern). Provides complete automation from metadata detection to ready-to-use TYPO3 backend access.
Create, configure, and manage TYPO3 extension tests (unit, functional, acceptance) following official TYPO3 testing framework patterns. Use when setting up tests, writing test cases, configuring PHPUnit, managing fixtures, or integrating CI/CD pipelines for TYPO3 extensions. Covers PHPUnit 11/12, TYPO3 v12/v13 LTS, modern dependency injection testing patterns, and comprehensive quality tooling (PHPStan level 10, Rector, php-cs-fixer).
Create isolated git worktrees with smart directory selection and safety verification
Use when starting feature work that needs isolation from current workspace or before executing implementation plans - creates isolated git worktrees with smart directory selection and safety verification
Use when starting any conversation - establishes mandatory workflows for finding and using skills, including using Skill tool before announcing usage, following brainstorming before coding, and creating TodoWrite todos for checklists
Build modern full-stack web applications with Next.js (App Router, Server Components, RSC, PPR, SSR, SSG, ISR), Turborepo (monorepo management, task pipelines, remote caching, parallel execution), and RemixIcon (3100+ SVG icons in outlined/filled styles). Use when creating React applications, implementing server-side rendering, setting up monorepos with multiple packages, optimizing build performance and caching strategies, adding icon libraries, managing shared dependencies, or working with TypeScript full-stack projects.
Toolkit for interacting with and testing local web applications using Playwright. Supports verifying frontend functionality, debugging UI behavior, capturing browser screenshots, and viewing browser logs.
Dispatch to the right problem-solving technique based on how you're stuck
Comprehensive Whop platform expert with access to 212 official documentation files covering memberships, payments, products, courses, experiences, forums, webhooks, and app development. Invoke when user mentions Whop, digital products, memberships, course platforms, or community monetization.
Create detailed implementation plans with bite-sized tasks for engineers with zero codebase context
TDD for process documentation - test with subagents before writing, iterate until bulletproof
Use when design is complete and you need detailed implementation tasks for engineers with zero codebase context - creates comprehensive implementation plans with exact file paths, complete code examples, and verification steps assuming engineer has minimal domain knowledge
Use when creating new skills, editing existing skills, or verifying skills work before deployment - applies TDD to process documentation by testing with subagents before writing, iterating until bulletproof against rationalization
Set up Browser Use Cloud payments with x402 — pay per request from a crypto wallet (USDC on Base mainnet), no signup or API key. Two setups it works out up front — "just use it" (set up a wallet so you or Claude Code can run cloud browser tasks paid from the wallet — Claude writes and runs throwaway scripts, nothing touches your codebase) or "build it in" (install the SDK and write the key + code into your project). Walks through wallet setup, funding, .env, and a ~$1 test run. Use when the user asks about x402, pay-per-use, USDC payments, or wants Browser Use Cloud without an API key. For the free-tier signup (reverse-CAPTCHA → API key), use `browser-use cloud signup` or the `cloud` skill instead.
Comprehensive spreadsheet creation, editing, and analysis with support for formulas, formatting, data analysis, and visualization. When Claude needs to work with spreadsheets (.xlsx, .xlsm, .csv, .tsv, etc) for: (1) Creating new spreadsheets with formulas and formatting, (2) Reading or analyzing data, (3) Modify existing spreadsheets while preserving formulas, (4) Data analysis and visualization in spreadsheets, or (5) Recalculating formulas
Download YouTube video transcripts when user provides a YouTube URL or asks to download/get/fetch a transcript from YouTube. Also use when user wants to transcribe or get captions/subtitles from a YouTube video.
Chunked N-D arrays for cloud storage. Compressed arrays, parallel I/O, S3/GCS integration, NumPy/Dask/Xarray compatible, for large-scale scientific computing pipelines.