fix(keyboard): Implement Tab and Backspace handling for Kitty Protocol (#7006)

packages/cli/src/ui/contexts/KeypressContext.test.tsx

@@ -17,6 +17,8 @@ import { EventEmitter } from 'events';
 import {
   KITTY_KEYCODE_ENTER,
   KITTY_KEYCODE_NUMPAD_ENTER,
+  KITTY_KEYCODE_TAB,
+  KITTY_KEYCODE_BACKSPACE,
   CHAR_CODE_ESC,
   CHAR_CODE_LEFT_BRACKET,
   CHAR_CODE_1,
@@ -282,6 +284,82 @@ describe('KeypressContext - Kitty Protocol', () => {
     });
   });
 
+  describe('Tab and Backspace handling', () => {
+    it('should recognize Tab key in kitty protocol', async () => {
+      const keyHandler = vi.fn();
+      const { result } = renderHook(() => useKeypressContext(), { wrapper });
+      act(() => result.current.subscribe(keyHandler));
+
+      act(() => {
+        stdin.sendKittySequence(`\x1b[${KITTY_KEYCODE_TAB}u`);
+      });
+
+      expect(keyHandler).toHaveBeenCalledWith(
+        expect.objectContaining({
+          name: 'tab',
+          kittyProtocol: true,
+          shift: false,
+        }),
+      );
+    });
+
+    it('should recognize Shift+Tab in kitty protocol', async () => {
+      const keyHandler = vi.fn();
+      const { result } = renderHook(() => useKeypressContext(), { wrapper });
+      act(() => result.current.subscribe(keyHandler));
+
+      // Modifier 2 is Shift
+      act(() => {
+        stdin.sendKittySequence(`\x1b[${KITTY_KEYCODE_TAB};2u`);
+      });
+
+      expect(keyHandler).toHaveBeenCalledWith(
+        expect.objectContaining({
+          name: 'tab',
+          kittyProtocol: true,
+          shift: true,
+        }),
+      );
+    });
+
+    it('should recognize Backspace key in kitty protocol', async () => {
+      const keyHandler = vi.fn();
+      const { result } = renderHook(() => useKeypressContext(), { wrapper });
+      act(() => result.current.subscribe(keyHandler));
+
+      act(() => {
+        stdin.sendKittySequence(`\x1b[${KITTY_KEYCODE_BACKSPACE}u`);
+      });
+
+      expect(keyHandler).toHaveBeenCalledWith(
+        expect.objectContaining({
+          name: 'backspace',
+          kittyProtocol: true,
+          meta: false,
+        }),
+      );
+    });
+
+    it('should recognize Option+Backspace in kitty protocol', async () => {
+      const keyHandler = vi.fn();
+      const { result } = renderHook(() => useKeypressContext(), { wrapper });
+      act(() => result.current.subscribe(keyHandler));
+
+      // Modifier 3 is Alt/Option
+      act(() => {
+        stdin.sendKittySequence(`\x1b[${KITTY_KEYCODE_BACKSPACE};3u`);
+      });
+
+      expect(keyHandler).toHaveBeenCalledWith(
+        expect.objectContaining({
+          name: 'backspace',
+          kittyProtocol: true,
+          meta: true,
+        }),
+      );
+    });
+  });
+
   describe('paste mode', () => {
     it('should handle multiline paste as a single event', async () => {
       const keyHandler = vi.fn();

packages/cli/src/ui/contexts/KeypressContext.tsx

@@ -22,8 +22,10 @@ import { PassThrough } from 'stream';
 import {
   BACKSLASH_ENTER_DETECTION_WINDOW_MS,
   KITTY_CTRL_C,
+  KITTY_KEYCODE_BACKSPACE,
   KITTY_KEYCODE_ENTER,
   KITTY_KEYCODE_NUMPAD_ENTER,
+  KITTY_KEYCODE_TAB,
   MAX_KITTY_SEQUENCE_LENGTH,
 } from '../utils/platformConstants.js';
 
@@ -136,6 +138,30 @@ export function KeypressProvider({
         };
       }
 
+      if (keyCode === KITTY_KEYCODE_TAB) {
+        return {
+          name: 'tab',
+          ctrl,
+          meta: alt,
+          shift,
+          paste: false,
+          sequence,
+          kittyProtocol: true,
+        };
+      }
+
+      if (keyCode === KITTY_KEYCODE_BACKSPACE) {
+        return {
+          name: 'backspace',
+          ctrl,
+          meta: alt,
+          shift,
+          paste: false,
+          sequence,
+          kittyProtocol: true,
+        };
+      }
+
       if (
         keyCode === KITTY_KEYCODE_ENTER ||
         keyCode === KITTY_KEYCODE_NUMPAD_ENTER

packages/cli/src/ui/utils/platformConstants.ts

@@ -22,6 +22,8 @@ export const KITTY_CTRL_C = '[99;5u';
  */
 export const KITTY_KEYCODE_ENTER = 13;
 export const KITTY_KEYCODE_NUMPAD_ENTER = 57414;
+export const KITTY_KEYCODE_TAB = 9;
+export const KITTY_KEYCODE_BACKSPACE = 127;
 
 /**
  * Timing constants for terminal interactions