Lookup-path hint for the supplied ID. auto uses namespace-aware routing, gsd treats the ID as sports-truth-facing, and on treats it as On-facing. It does not change source-of-truth ownership.
language
Optional BCP 47 language hint such as en-US. Use it when the host needs translated provider output.
idSource=auto uses namespace-aware routing. idSource=gsd treats the supplied ID as sports-truth-facing. idSource=on treats the supplied ID as an On sports-event ref.
idSource changes how the server looks up the event, not who owns the returned event truth.
The summary includes event identity, competition or series context, timing, status, participant sides, score or result snapshot when available, venue, and reusable refs.
It explicitly excludes full lineups, play-by-play, stat groups, odds tables, watchability, media, and editorial.