Anthropic has a large open-source repository for Claude Skills with 173K+ Github stars

These "skills" are predefined folders filled with specific instructions that your model/agent loads only when needed, on the fly to handle specialized tasks like creating documents or testing web apps.

So you dont have to type out long prompts every time, instead, the system learns your workflow once and executes it automatically.

There is also a specialized skill designed specifically to help you build brand new skills from scratch.

each skill only consumes about 100 tokens just to read the basic metadata.

This setup means the full instructions are only loaded into the active memory when the specific task actually requires them. Your main context window stays entirely clear of unnecessary instructions until the exact moment they are needed.

you can install these tools using a single terminal command so they work seamlessly across the web interface and the API.