diff --git a/memento-note/app/api/chat/route.ts b/memento-note/app/api/chat/route.ts
index bc6afdc..00dd784 100644
--- a/memento-note/app/api/chat/route.ts
+++ b/memento-note/app/api/chat/route.ts
@@ -419,7 +419,11 @@ Never switch to another language. Even if the user writes in a different languag
     webSearch: !!webSearch,
     config,
   }
-  const chatTools = toolRegistry.buildToolsForChat(chatToolContext)
+  // When scoped to "this note", only provide web tools — no note_search/note_read
+  // to prevent the AI from pulling information from other notes
+  const chatTools = noteContext
+    ? toolRegistry.buildToolsForChat({ ...chatToolContext, webOnly: true })
+    : toolRegistry.buildToolsForChat(chatToolContext)
 
   // 8. Save user message to DB before streaming
   if (isNewMessage && lastIncoming) {
diff --git a/memento-note/lib/ai/tools/registry.ts b/memento-note/lib/ai/tools/registry.ts
index 262b621..e1eb75a 100644
--- a/memento-note/lib/ai/tools/registry.ts
+++ b/memento-note/lib/ai/tools/registry.ts
@@ -49,9 +49,10 @@ class ToolRegistry {
   /**
    * Build tools for the chat endpoint.
    * Includes internal tools (note_search, note_read) and web tools when configured.
+   * When webOnly is true, only web tools are included (no note access).
    */
-  buildToolsForChat(ctx: ToolContext): Record<string, any> {
-    const toolNames: string[] = ['note_search', 'note_read']
+  buildToolsForChat(ctx: ToolContext & { webOnly?: boolean }): Record<string, any> {
+    const toolNames: string[] = ctx.webOnly ? [] : ['note_search', 'note_read']
 
     // Add web tools only when user toggled web search AND config is present
     if (ctx.webSearch) {