Under the hood
Sizing hints for diff-review subagents can now reuse a caller-supplied line count instead of always recomputing it
What
When Claude Code estimates how many helper subagents to use for reviewing a diff, it computes a budget hint based on how many lines changed. This logic can now accept a pre-supplied diff line count from the caller instead of always recalculating it itself, and adjusts its "about N lines" guidance text and subagent count accordingly.
Why
This avoids redundant recomputation when a line count is already available, and keeps the guidance text accurate to whichever count is actually used.