The built-in skill set that ships with every agent already covers a wide range of uses: web research, writing and summarizing, coding help, image generation, scheduled task management, among others. Nothing to activate or configure — they're available as soon as the agent goes live.
For something more specific to your business, a custom skill can be added — we recently did this for checking French e-invoice compliance (Factur-X, part of the French e-invoicing reform): a skill that reads an invoice, validates it against the official schemas, and reports whether it's compliant. This kind of addition happens on request: you describe the need, our team builds and installs the skill on your agent. There's no self-service catalog today where you'd install one yourself — we set it up on your behalf.