Android Skills are open-standard markdown files (skills.md) that provide modular instruction sets for AI agents and tools, grounding LLMs with up-to-date, domain-specific Android knowledge. They address the limitation of LLMs having outdated training data by delivering current Android framework guidance on demand. Google has published an official Android Skills repository covering workflows like AGP9 upgrades, XML-to-Compose migrations, Navigation 3 integration, and edge-to-edge support. Skills integrate with Android Studio and Android CLI, can be auto-activated or manually added, and are reusable across any AI tool supporting the standard. A live demo shows the XML-to-Compose migration skill guiding an agent through migrating the Sunflower sample app. Tips for writing custom skills include keeping them concise, targeting only areas where LLMs lack knowledge, and always validating skills from trusted sources.