feat(coding-agent): add configurable working indicator closes #3413

packages/coding-agent/src/core/extensions/index.ts

@@ -149,6 +149,7 @@ export type {
 	UserBashEvent,
 	UserBashEventResult,
 	WidgetPlacement,
+	WorkingIndicatorOptions,
 	WriteToolCallEvent,
 	WriteToolResultEvent,
 } from "./types.js";

packages/coding-agent/src/core/extensions/runner.ts

@@ -167,8 +167,8 @@ export type ShutdownHandler = () => void;
  * Helper function to emit session_shutdown event to extensions.
  * Returns true if the event was emitted, false if there were no handlers.
  */
-export async function emitSessionShutdownEvent(extensionRunner: ExtensionRunner | undefined): Promise<boolean> {
-	if (extensionRunner?.hasHandlers("session_shutdown")) {
+export async function emitSessionShutdownEvent(extensionRunner: ExtensionRunner): Promise<boolean> {
+	if (extensionRunner.hasHandlers("session_shutdown")) {
 		await extensionRunner.emit({
 			type: "session_shutdown",
 		});
@@ -185,6 +185,7 @@ const noOpUIContext: ExtensionUIContext = {
 	onTerminalInput: () => () => {},
 	setStatus: () => {},
 	setWorkingMessage: () => {},
+	setWorkingIndicator: () => {},
 	setHiddenThinkingLabel: () => {},
 	setWidget: () => {},
 	setFooter: () => {},

packages/coding-agent/src/core/extensions/types.ts

@@ -102,6 +102,14 @@ export interface ExtensionWidgetOptions {
 /** Raw terminal input listener for extensions. */
 export type TerminalInputHandler = (data: string) => { consume?: boolean; data?: string } | undefined;
 
+/** Working indicator configuration for the interactive streaming loader. */
+export interface WorkingIndicatorOptions {
+	/** Animation frames. Use an empty array to hide the indicator entirely. */
+	frames?: string[];
+	/** Frame interval in milliseconds for animated indicators. */
+	intervalMs?: number;
+}
+
 /**
  * UI context for extensions to request interactive UI.
  * Each mode (interactive, RPC, print) provides its own implementation.
@@ -128,6 +136,15 @@ export interface ExtensionUIContext {
 	/** Set the working/loading message shown during streaming. Call with no argument to restore default. */
 	setWorkingMessage(message?: string): void;
 
+	/**
+	 * Configure the interactive working indicator shown during streaming.
+	 *
+	 * - Omit the argument to restore the default animated spinner.
+	 * - Use `frames: ["●"]` for a static indicator.
+	 * - Use `frames: []` to hide the indicator entirely.
+	 */
+	setWorkingIndicator(options?: WorkingIndicatorOptions): void;
+
 	/** Set the label shown for hidden thinking blocks. Call with no argument to restore default. */
 	setHiddenThinkingLabel(label?: string): void;