How THIS surface spells the capability's own command — sheetxl api, .api. Defaults to the
bare name, which is the spelling of a tool call.
Remarks
An answer that points at a follow-up ("everything on the type: …") is printing something to
be typed, and the same capability is typed differently on each surface. This is the one
affordance a renderer cannot work out for itself.
What a surface tells a renderer about itself.