diff --git a/apps/agent/entrypoints/background/scheduledJobRuns.ts b/apps/agent/entrypoints/background/scheduledJobRuns.ts
index 98102fc5..0257048b 100644
--- a/apps/agent/entrypoints/background/scheduledJobRuns.ts
+++ b/apps/agent/entrypoints/background/scheduledJobRuns.ts
@@ -109,25 +109,6 @@ export const scheduledJobRuns = async () => {
       throw new Error(`Job not found: ${jobId}`)
     }
 
-    const backgroundWindow = await chrome.windows.create({
-      url: 'chrome://newtab',
-      focused: false,
-      state: 'minimized',
-      type: 'normal',
-    })
-
-    // FIXME: Race condition - the controller-ext extension sends a window_created
-    // WebSocket message to register window ownership, but our HTTP request may arrive
-    // at the server before that registration completes. This delay is a temporary fix.
-    // Proper solution: ControllerBridge should wait/poll for window ownership registration.
-    await new Promise((resolve) => setTimeout(resolve, 1000))
-
-    const backgroundTab = backgroundWindow?.tabs?.[0]
-
-    if (!backgroundWindow || !backgroundTab) {
-      throw new Error('Failed to create background window')
-    }
-
     const jobRun = await createJobRun(jobId, 'running')
     const abortController = new AbortController()
     runAbortControllers.set(jobRun.id, abortController)
@@ -135,8 +116,6 @@ export const scheduledJobRuns = async () => {
     try {
       const response = await getChatServerResponse({
         message: job.query,
-        activeTab: backgroundTab,
-        windowId: backgroundWindow.id,
         signal: abortController.signal,
       })
 
@@ -163,13 +142,6 @@ export const scheduledJobRuns = async () => {
       })
     } finally {
       runAbortControllers.delete(jobRun.id)
-      if (backgroundWindow.id) {
-        try {
-          await chrome.windows.remove(backgroundWindow.id)
-        } catch {
-          // Window may already be closed
-        }
-      }
       await updateJobLastRunAt(jobId)
     }
   }
diff --git a/apps/server/src/agent/prompt.ts b/apps/server/src/agent/prompt.ts
index f1efc7ca..08b7b661 100644
--- a/apps/server/src/agent/prompt.ts
+++ b/apps/server/src/agent/prompt.ts
@@ -352,11 +352,15 @@ function getPageContext(
     '\n\n**CRITICAL RULES:**\n1. **Do NOT call `get_active_page` or `list_pages` to find your starting page.** Use the **page ID from the Browser Context** directly.'
 
   if (options?.isScheduledTask) {
-    const windowLine = options.scheduledTaskWindowId
-      ? `When creating new pages with \`new_page\`, always pass \`windowId: ${options.scheduledTaskWindowId}\`.`
-      : 'When creating new pages with `new_page`, pass the `windowId` from the Browser Context.'
-    prompt += `\n2. ${windowLine}`
-    prompt += '\n3. Complete the task end-to-end and report results.'
+    const windowRef = options.scheduledTaskWindowId
+      ? `\`windowId: ${options.scheduledTaskWindowId}\``
+      : 'the `windowId` from the Browser Context'
+    prompt += `\n2. **Always pass ${windowRef}** when calling \`new_page\` or \`new_hidden_page\`. Never omit the \`windowId\` parameter.`
+    prompt +=
+      '\n3. **Do NOT close your dedicated hidden window** (via `close_window`). It is managed by the system and will be cleaned up automatically.'
+    prompt +=
+      '\n4. **Do NOT create new windows** (via `create_window` or `create_hidden_window`). Use your existing hidden window for all pages.'
+    prompt += '\n5. Complete the task end-to-end and report results.'
   }
 
   prompt += '\n</page_context>'