Claude Skills: Customize AI for your workflows Anthropic

These new "skills" for Claude create a whole new way to extend the capabilities of an LLM.

Skills are:

• Composable: Skills stack together. Claude automatically identifies which skills are needed and coordinates their use.
• Portable: Skills use the same format everywhere. Build once, use across Claude apps, Claude Code, and API.
• Efficient: Only loads what's needed, when it's needed.
• Powerful: Skills can include executable code for tasks where traditional programming is more reliable than token generation.

Think of Skills as custom onboarding materials that let you package expertise, making Claude a specialist on what matters most to you.

First with MCP, and now with Skills, we can create solutions that mix the AI non-deterministic solutions with the traditional software solutions. Simon Willison says they are are awesome, maybe a bigger deal than MCP which is saying a lot.