Enha: remove old tool calls

helpfuncs.go

@@ -9,6 +9,8 @@ import (
 	"path"
 	"strings"
 	"unicode"
+
+	"math/rand/v2"
 )
 
 func isASCII(s string) bool {
@@ -239,3 +241,13 @@ func makeStatusLine() string {
 		isRecording, persona, botPersona, injectRole)
 	return statusLine + imageInfo + shellModeInfo
 }
+
+var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
+
+func randString(n int) string {
+	b := make([]rune, n)
+	for i := range b {
+		b[i] = letters[rand.IntN(len(letters))]
+	}
+	return string(b)
+}