web sources is offline catalog discovery. --available reports current configuration; it does not prove a live provider request will succeed. web describe supplies native inputs, filters, example syntax and stated limits. When two engines expose the same operation ID, specify --engine to see the intended contract. A large unscoped JSON catalog can be unwieldy; scoped discovery keeps the next choice visible.
Pages, news and visual evidence
Social posts, communities and video
Companies, work and reputation
Travel, places and property
Shopping, apps and stores
Websites and market signals
An operation name points to a possible kind of information, not guaranteed coverage of a particular account, page, date or field. A returned
resource is the next supported handoff only when it includes an actionable target; result handling explains that boundary.