Two types of Skills — built-in and custom

There are two types of Skills. The first type is Skills from Anthropic. These are skills created and maintained by Anthropic. They include advanced document creation capabilities for Excel, Word, PowerPoint, and PDF files. Built-in Skills are available to all paid users, and Claude invokes them automatically when needed. You don't need to do anything special to use them. The second type is custom Skills. You or your organization create them yourselves for specialized workflows and tasks specific to your field. For example, you could create a skill that applies corporate brand standards to presentations, structures meeting notes in a specific format, or executes your organization's analytical processes. Custom Skills allow you to literally "train" Claude on your specific workflows, standards, and ways of working, so that it applies this knowledge automatically in any suitable situation.