diff --git a/.changeset/sanitize-task-output.md b/.changeset/sanitize-task-output.md
new file mode 100644
index 0000000000..0477295aea
--- /dev/null
+++ b/.changeset/sanitize-task-output.md
@@ -0,0 +1,5 @@
+---
+"@moonshot-ai/kimi-code": patch
+---
+
+Prevent background task output from disrupting terminal pane borders.
diff --git a/apps/kimi-code/src/tui/components/dialogs/task-output-viewer.ts b/apps/kimi-code/src/tui/components/dialogs/task-output-viewer.ts
index 4a463671cb..ad266fbb62 100644
--- a/apps/kimi-code/src/tui/components/dialogs/task-output-viewer.ts
+++ b/apps/kimi-code/src/tui/components/dialogs/task-output-viewer.ts
@@ -22,6 +22,7 @@ import type { BackgroundTaskInfo, BackgroundTaskStatus } from '@moonshot-ai/kimi
 
 import { currentTheme } from '#/tui/theme';
 import { printableChar } from '@/tui/utils/printable-key';
+import { sanitizeShellOutput } from '#/tui/utils/shell-output';
 
 const ELLIPSIS = '…';
 
@@ -104,7 +105,7 @@ export class TaskOutputViewer extends Container implements Focusable {
   }
 
   private splitOutput(output: string): string[] {
-    return (output.length > 0 ? output : '[no output captured]').split('\n');
+    return (output.length > 0 ? sanitizeShellOutput(output) : '[no output captured]').split('\n');
   }
 
   // ── input ──────────────────────────────────────────────────────────
diff --git a/apps/kimi-code/src/tui/components/dialogs/tasks-browser.ts b/apps/kimi-code/src/tui/components/dialogs/tasks-browser.ts
index 1874d0e7a0..1b33a5bf3a 100644
--- a/apps/kimi-code/src/tui/components/dialogs/tasks-browser.ts
+++ b/apps/kimi-code/src/tui/components/dialogs/tasks-browser.ts
@@ -27,6 +27,7 @@ import type { BackgroundTaskInfo, BackgroundTaskStatus } from '@moonshot-ai/kimi
 import { SELECT_POINTER } from '@/tui/constant/symbols';
 import { currentTheme } from '#/tui/theme';
 import { printableChar } from '@/tui/utils/printable-key';
+import { sanitizeShellOutput } from '#/tui/utils/shell-output';
 
 const ELLIPSIS = '…';
 
@@ -603,7 +604,7 @@ export class TasksBrowserApp extends Container implements Focusable {
     if (this.props.tailLoading) body = '[loading…]';
     else if (this.props.tailOutput === undefined || this.props.tailOutput.length === 0)
       body = '[no output captured]';
-    else body = this.props.tailOutput;
+    else body = sanitizeShellOutput(this.props.tailOutput);
 
     const rawLines = body.split('\n');
     const tailLines = rawLines.slice(-innerHeight);
diff --git a/apps/kimi-code/test/tui/task-output-viewer.test.ts b/apps/kimi-code/test/tui/task-output-viewer.test.ts
index 5948ec6c84..41470c96b3 100644
--- a/apps/kimi-code/test/tui/task-output-viewer.test.ts
+++ b/apps/kimi-code/test/tui/task-output-viewer.test.ts
@@ -111,6 +111,17 @@ describe('TaskOutputViewer — rendering', () => {
     expect(out).toContain('delta');
     expect(out).toContain('echo');
   });
+
+  it('does not pass terminal controls from task output into the framed body', () => {
+    const rendered = makeViewer({
+      output: 'Downloading wheel 25%\rDownloading wheel 75%\u001B[2Jdone',
+    }).render(120);
+    const raw = rendered.join('\n');
+
+    expect(raw).not.toContain('\r');
+    expect(raw).not.toContain('\u001B[2J');
+    expect(strip(raw)).toContain('Downloading wheel 25%Downloading wheel 75%done');
+  });
 });
 
 describe('TaskOutputViewer — scrolling', () => {
diff --git a/apps/kimi-code/test/tui/tasks-browser.test.ts b/apps/kimi-code/test/tui/tasks-browser.test.ts
index 7d5a54c3bf..d173af25ff 100644
--- a/apps/kimi-code/test/tui/tasks-browser.test.ts
+++ b/apps/kimi-code/test/tui/tasks-browser.test.ts
@@ -243,6 +243,19 @@ describe('TasksBrowserApp — full-screen rendering', () => {
     expect(out).toContain('listening on :3000');
   });
 
+  it('does not pass terminal controls from tail output into the framed preview', () => {
+    const rendered = makeApp({
+      tasks: [task({ taskId: 'bash-aaaaaaaa' })],
+      selectedTaskId: 'bash-aaaaaaaa',
+      tailOutput: 'Downloading wheel 25%\rDownloading wheel 75%\u001B[2Jdone',
+    }).render(120);
+    const raw = rendered.join('\n');
+
+    expect(raw).not.toContain('\r');
+    expect(raw).not.toContain('\u001B[2J');
+    expect(strip(raw)).toContain('Downloading wheel 25%Downloading wheel 75%done');
+  });
+
   it('shows a loading state when tail is loading', () => {
     const out = strip(
       makeApp({