diff --git a/gai-frontend/lib/chat/scripting/extensions/improver.ts b/gai-frontend/lib/chat/scripting/extensions/improver.ts
new file mode 100644
index 000000000..18b068824
--- /dev/null
+++ b/gai-frontend/lib/chat/scripting/extensions/improver.ts
@@ -0,0 +1,34 @@
+/// An extension that improves user prompts using Claude before sending to the selected model.
+/// <reference path="../chat_scripting_api.ts" />
+
+function onUserPrompt(userPrompt: string): void {
+    (async () => {
+        chatSystemMessage('Extension: Prompt Improver');
+
+        // Create a message asking Claude to improve the prompt
+        const improvementMessage = new ChatMessage(
+            ChatMessageSource.CLIENT,
+            `You are a prompt improvement assistant. Your task is to improve the following prompt to be ` +
+            `more specific, clear, and effective. Maintain the original intent but make it more detailed ` +
+            `and precise. Respond with only the improved prompt, no explanations: ` +
+            `{BEGIN_PROMPT}${userPrompt}{END_PROMPT}`,
+            {}
+        );
+
+        // Send to Claude for improvement
+        const improvedResponse = await chatSendToModel([improvementMessage], 'claude-3-5-sonnet-latest');
+        const improvedPrompt = improvedResponse.msg.trim();
+
+        // Log the original and improved prompts
+        chatSystemMessage(`Original prompt: ${userPrompt}`);
+        chatSystemMessage(`Improved prompt: ${improvedPrompt}`);
+
+        // Create a message with the improved prompt
+        const userMessage = new ChatMessage(ChatMessageSource.CLIENT, improvedPrompt, {});
+        addChatMessage(userMessage);
+
+        // Send to the first user-selected model
+        const modelId = getUserSelectedModels()[0].id;
+        addChatMessage(await sendMessagesToModel([userMessage], modelId, null));
+    })();
+}