diff --git a/tools/cmd/clipboard/read.go b/tools/cmd/clipboard/read.go
index 664e7ab02..86448906f 100644
--- a/tools/cmd/clipboard/read.go
+++ b/tools/cmd/clipboard/read.go
@@ -16,6 +16,8 @@ import (
 	"kitty/tools/tui/loop"
 	"kitty/tools/utils"
 	"kitty/tools/utils/images"
+
+	"golang.org/x/exp/slices"
 )
 
 var _ = fmt.Print
@@ -144,13 +146,13 @@ func (self *Output) assign_mime_type(available_mimes []string, aliases map[strin
 		self.remote_mime_type = "."
 		return
 	}
-	if utils.Contains(available_mimes, self.mime_type) {
+	if slices.Contains(available_mimes, self.mime_type) {
 		self.remote_mime_type = self.mime_type
 		return
 	}
 	if len(aliases[self.mime_type]) > 0 {
 		for _, alias := range aliases[self.mime_type] {
-			if utils.Contains(available_mimes, alias) {
+			if slices.Contains(available_mimes, alias) {
 				self.remote_mime_type = alias
 				return
 			}
diff --git a/tools/utils/misc.go b/tools/utils/misc.go
index 760422de3..89c227f9a 100644
--- a/tools/utils/misc.go
+++ b/tools/utils/misc.go
@@ -120,19 +120,6 @@ func Min[T constraints.Ordered](a T, items ...T) (ans T) {
 	return ans
 }
 
-func Index[T comparable](haystack []T, needle T) int {
-	for i, x := range haystack {
-		if x == needle {
-			return i
-		}
-	}
-	return -1
-}
-
-func Contains[T comparable](haystack []T, needle T) bool {
-	return Index(haystack, needle) > -1
-}
-
 // Keys returns the keys of the map m.
 // The keys will be an indeterminate order.
 func Keys[M ~map[K]V, K comparable, V any](m M) []K {