grep

Optional total cap on returned matches across all routed backends. None returns every match; an int enforces the cap globally (not per backend), short-circuits remaining routes once the cap is reached, and flags the result truncated=True.

Unlike a single backend, composite does not guarantee the "exactly max_count matches means complete" boundary: when an earlier route fills the budget exactly, the remaining routes are short-circuited and the result is flagged truncated=True even if those routes would have contributed nothing. The flag is thus conservative — it may over-report truncation, never under-report.