diff --git a/apps/ai-game-creator-shell/src-tauri/src/ui_editor/commands/separation/model/note.rs b/apps/ai-game-creator-shell/src-tauri/src/ui_editor/commands/separation/model/note.rs
index 15c500b59..dbac38464 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/ui_editor/commands/separation/model/note.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/ui_editor/commands/separation/model/note.rs
@@ -1,5 +1,24 @@
 use serde::{Deserialize, Serialize};
 use ts_rs::TS;
+use super::MAX_REWORK_NOTE_CHARS;
+
+pub const MAX_NOTE_DESCRIPTION_CHARS: usize = 1024;
+
+pub fn sanitize_prompt_text(value: &str, max_chars: usize) -> String {
+    value
+        .chars()
+        .filter_map(|character| {
+            if character.is_control() {
+                Some(' ')
+            } else if character == '`' {
+                Some('＇')
+            } else {
+                Some(character)
+            }
+        })
+        .take(max_chars)
+        .collect()
+}
 
 #[derive(Clone, Debug, Default, Deserialize, PartialEq, Serialize, TS)]
 #[ts(export, export_to = concat!(env!("CARGO_MANIFEST_DIR"), "/../src/features/ui-editor/types/"))]
@@ -10,12 +29,15 @@ pub struct SeparationNote {
 
 impl SeparationNote {
     pub fn as_prompt(&self) -> String {
-        let mut prompt = format!("desc: {}", self.description);
+        let mut prompt = format!(
+            "desc: {}",
+            sanitize_prompt_text(&self.description, MAX_NOTE_DESCRIPTION_CHARS)
+        );
         if !self.rework_notes.is_empty() {
             prompt.push_str("\nprevious rework notes:");
             for note in &self.rework_notes {
                 prompt.push_str("\n- ");
-                prompt.push_str(note);
+                prompt.push_str(&sanitize_prompt_text(note, MAX_REWORK_NOTE_CHARS));
             }
         }
         prompt