Add Ctrl+D to exit when editor is empty

- Add isCtrlD helper to keys.ts
- CustomEditor intercepts Ctrl+D and only triggers callback when editor is empty
- Single Ctrl+D with empty input exits immediately
- Update CHANGELOG to frame as feature (Kitty protocol support) not fix

packages/coding-agent/CHANGELOG.md

@@ -2,9 +2,9 @@
 
 ## [Unreleased]
 
-### Fixed
+### Added
 
-- **Shift+Enter for newlines**: Fixed Shift+Enter not working for newlines in Ghostty, Kitty, WezTerm, and other terminals supporting the Kitty keyboard protocol. Also fixed Alt+Enter, Shift+Tab, and all Ctrl+key combinations (Ctrl+A/C/E/K/O/P/T/U/W). (by [@kim0](https://github.com/kim0))
+- **Kitty keyboard protocol support**: Added support for the Kitty keyboard protocol, enabling Shift+Enter, Alt+Enter, Shift+Tab, Ctrl+D to exit, and all Ctrl+key combinations to work in Ghostty, Kitty, WezTerm, and other modern terminals. (by [@kim0](https://github.com/kim0))
 
 ## [0.23.4] - 2025-12-18
 

packages/coding-agent/src/modes/interactive/components/custom-editor.ts

@@ -1,4 +1,4 @@
-import { Editor, isCtrlC, isCtrlO, isCtrlP, isCtrlT, isShiftTab } from "@mariozechner/pi-tui";
+import { Editor, isCtrlC, isCtrlD, isCtrlO, isCtrlP, isCtrlT, isShiftTab } from "@mariozechner/pi-tui";
 
 /**
  * Custom editor that handles Escape and Ctrl+C keys for coding-agent
@@ -6,6 +6,7 @@ import { Editor, isCtrlC, isCtrlO, isCtrlP, isCtrlT, isShiftTab } from "@marioze
 export class CustomEditor extends Editor {
 	public onEscape?: () => void;
 	public onCtrlC?: () => void;
+	public onCtrlD?: () => void;
 	public onShiftTab?: () => void;
 	public onCtrlP?: () => void;
 	public onCtrlO?: () => void;
@@ -49,6 +50,15 @@ export class CustomEditor extends Editor {
 			return;
 		}
 
+		// Intercept Ctrl+D (only when editor is empty)
+		if (isCtrlD(data)) {
+			if (this.getText().length === 0 && this.onCtrlD) {
+				this.onCtrlD();
+			}
+			// Always consume Ctrl+D (don't pass to parent)
+			return;
+		}
+
 		// Pass to parent for normal handling
 		super.handleInput(data);
 	}

packages/coding-agent/src/modes/interactive/interactive-mode.ts

@@ -562,6 +562,7 @@ export class InteractiveMode {
 		};
 
 		this.editor.onCtrlC = () => this.handleCtrlC();
+		this.editor.onCtrlD = () => this.handleCtrlD();
 		this.editor.onShiftTab = () => this.cycleThinkingLevel();
 		this.editor.onCtrlP = () => this.cycleModel();
 		this.editor.onCtrlO = () => this.toggleToolOutputExpansion();
@@ -1128,6 +1129,12 @@ export class InteractiveMode {
 		}
 	}
 
+	private handleCtrlD(): void {
+		// Only called when editor is empty (enforced by CustomEditor)
+		this.stop();
+		process.exit(0);
+	}
+
 	private updateEditorBorderColor(): void {
 		if (this.isBashMode) {
 			this.editor.borderColor = theme.getBashModeBorderColor();

packages/tui/src/index.ts

@@ -23,6 +23,7 @@ export {
 	isAltBackspace,
 	isCtrlA,
 	isCtrlC,
+	isCtrlD,
 	isCtrlE,
 	isCtrlK,
 	isCtrlO,

packages/tui/src/keys.ts

@@ -18,6 +18,7 @@ const CODEPOINTS = {
 	// Letters (lowercase ASCII)
 	a: 97,
 	c: 99,
+	d: 100,
 	e: 101,
 	k: 107,
 	o: 111,
@@ -52,6 +53,7 @@ export const Keys = {
 	// Ctrl+<letter> combinations
 	CTRL_A: kittySequence(CODEPOINTS.a, MODIFIERS.ctrl),
 	CTRL_C: kittySequence(CODEPOINTS.c, MODIFIERS.ctrl),
+	CTRL_D: kittySequence(CODEPOINTS.d, MODIFIERS.ctrl),
 	CTRL_E: kittySequence(CODEPOINTS.e, MODIFIERS.ctrl),
 	CTRL_K: kittySequence(CODEPOINTS.k, MODIFIERS.ctrl),
 	CTRL_O: kittySequence(CODEPOINTS.o, MODIFIERS.ctrl),
@@ -97,6 +99,7 @@ export function isKittyKey(data: string, codepoint: number, modifier: number): b
 const RAW = {
 	CTRL_A: "\x01",
 	CTRL_C: "\x03",
+	CTRL_D: "\x04",
 	CTRL_E: "\x05",
 	CTRL_K: "\x0b",
 	CTRL_O: "\x0f",
@@ -122,6 +125,13 @@ export function isCtrlC(data: string): boolean {
 	return data === RAW.CTRL_C || data === Keys.CTRL_C;
 }
 
+/**
+ * Check if input matches Ctrl+D (raw byte or Kitty protocol).
+ */
+export function isCtrlD(data: string): boolean {
+	return data === RAW.CTRL_D || data === Keys.CTRL_D;
+}
+
 /**
  * Check if input matches Ctrl+E (raw byte or Kitty protocol).
  */