clarify middle_out keep-tail fallback behavior

riturajFi · riturajFi · commit e30fa1b2495f · 2026-01-14T18:25:47.000+05:30
diff --git a/src/server/api/go/internal/pkg/editor/strategy_middle_out.go b/src/server/api/go/internal/pkg/editor/strategy_middle_out.go
@@ -40,6 +40,9 @@ func (s *MiddleOutStrategy) Apply(messages []model.Message) ([]model.Message, er
 		)
 		totalTokens -= removedTokens
 	}
+	// Keep-tail fallback: if removing only middle messages can't meet the budget,
+	// drop the oldest remaining messages (idx=0). This preserves recency and only
+	// removes the last message if it alone still exceeds the budget.
 	for totalTokens > s.TokenReduceTo && len(result) > 0 {
 		var removedTokens int
 		result, resultTokens, removedTokens = removeWithToolPairing(

Original file line number	Diff line number	Diff line change
`@@ -40,6 +40,9 @@ func (s *MiddleOutStrategy) Apply(messages []model.Message) ([]model.Message, er`
`40`	`40`	`)`
`41`	`41`	`totalTokens -= removedTokens`
`42`	`42`	`}`
	`43`	`+ // Keep-tail fallback: if removing only middle messages can't meet the budget,`
	`44`	`+ // drop the oldest remaining messages (idx=0). This preserves recency and only`
	`45`	`+ // removes the last message if it alone still exceeds the budget.`
`43`	`46`	`for totalTokens > s.TokenReduceTo && len(result) > 0 {`
`44`	`47`	`var removedTokens int`
`45`	`48`	`result, resultTokens, removedTokens = removeWithToolPairing(`