Upgrade any skill to v5 Hybrid format using decision theory + modal logic

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.

Toolkit for creating animated GIFs optimized for Slack, with validators for size constraints and composable animation primitives. This skill applies when users request animated GIFs or emoji...

Applies Anthropic's official brand colors and typography to any sort of artifact that may benefit from having Anthropic's look-and-feel. Use it when brand colors or style guidelines, visual...

Master guide for using Claude Code effectively. Includes configuration templates, prompting strategies "Thinking" keywords, debugging techniques, and best practices for interacting with the agent.

Async REPL Protocol

MCP Script Rules

Skill Development Rules

No Polling for Background Agents

Store a learning, pattern, or decision in the memory system for future recall

Router-First Architecture

Check reference SDK implementations using btca ask

Get a token-efficient overview of any project using the TLDR stack

LLM Tuning Patterns

Parallel Agent Type Contracts

Maps questions to the optimal tldr command. Use this to pick the right layer

AI-powered web search, research, and reasoning via Perplexity

Implement technical plans from thoughts/shared/plans with verification

Planning agent that creates implementation plans and handoffs from conversation context

Deep interview process to transform vague ideas into detailed specs. Works for technical and non-technical users.