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Every skill is a typed capability — inputs, outputs, side effects, cost envelope, required credentials. Turn them on in the builder and your agent can do those things. Turn them off and it can't. Everything listed here is live in production.
Every skill in this catalog started as a customer request. If you're missing something, write it yourself against the Skill SDK, or tell us and we'll build it. Turnaround on common integrations is about two weeks.