Indicate custom modes to screen reader users in chat input (microsoft#273579)

fixes microsoft#273161

Author: meganrogge

src/vs/workbench/contrib/chat/browser/chatInputPart.ts

@@ -137,6 +137,11 @@ export interface IWorkingSetEntry {
 	uri: URI;
 }
 
+interface ICustomMode {
+	mode: string;
+	argumentHint?: string;
+}
+
 const GlobalLastChatModeKey = 'chat.lastChatMode';
 
 export class ChatInputPart extends Disposable implements IHistoryNavigationWidget {
@@ -319,13 +324,18 @@ export class ChatInputPart extends Disposable implements IHistoryNavigationWidge
 	readonly onDidChangeCurrentChatMode: Event<void> = this._onDidChangeCurrentChatMode.event;
 
 	private readonly _currentModeObservable: ISettableObservable<IChatMode>;
+	private readonly _currentModeLabelObservable: ISettableObservable<ICustomMode>;
 	public get currentModeKind(): ChatModeKind {
 		const mode = this._currentModeObservable.get();
 		return mode.kind === ChatModeKind.Agent && !this.agentService.hasToolsAgent ?
 			ChatModeKind.Edit :
 			mode.kind;
 	}
 
+	public get currentModeLabel(): IObservable<ICustomMode> {
+		return this._currentModeLabelObservable;
+	}
+
 	public get currentModeObs(): IObservable<IChatMode> {
 		return this._currentModeObservable;
 	}
@@ -425,6 +435,7 @@ export class ChatInputPart extends Disposable implements IHistoryNavigationWidge
 		super();
 		this._contextResourceLabels = this._register(this.instantiationService.createInstance(ResourceLabels, { onDidChangeVisibility: this._onDidChangeVisibility.event }));
 		this._currentModeObservable = observableValue<IChatMode>('currentMode', this.options.defaultMode ?? ChatMode.Agent);
+		this._currentModeLabelObservable = observableValue<ICustomMode>('currentModeLabel', { mode: (this.options.defaultMode ?? ChatMode.Agent).label, argumentHint: (this.options.defaultMode ?? ChatMode.Agent).description.get() });
 
 		this._register(this.editorService.onDidActiveEditorChange(() => {
 			this._indexOfLastOpenedContext = -1;
@@ -746,6 +757,7 @@ export class ChatInputPart extends Disposable implements IHistoryNavigationWidge
 		}
 
 		this._currentModeObservable.set(mode, undefined);
+		this._currentModeLabelObservable.set({ mode: mode.label, argumentHint: mode.argumentHint?.get() }, undefined);
 		this.chatModeKindKey.set(mode.kind);
 		this._onDidChangeCurrentChatMode.fire();
 
@@ -798,23 +810,29 @@ export class ChatInputPart extends Disposable implements IHistoryNavigationWidge
 		if (verbose) {
 			kbLabel = this.keybindingService.lookupKeybinding(AccessibilityCommandId.OpenAccessibilityHelp)?.getLabel();
 		}
+		const mode = this._currentModeObservable.get();
 
 		// Include model information if available
 		const modelName = this._currentLanguageModel?.metadata.name;
 		const modelInfo = modelName ? localize('chatInput.model', ", {0}. ", modelName) : '';
 
 		let modeLabel = '';
-		switch (this.currentModeKind) {
-			case ChatModeKind.Agent:
-				modeLabel = localize('chatInput.mode.agent', "(Agent), edit files in your workspace.");
-				break;
-			case ChatModeKind.Edit:
-				modeLabel = localize('chatInput.mode.edit', "(Edit), edit files in your workspace.");
-				break;
-			case ChatModeKind.Ask:
-			default:
-				modeLabel = localize('chatInput.mode.ask', "(Ask), ask questions or type / for topics.");
-				break;
+		if (!mode.isBuiltin) {
+			const mode = this.currentModeLabel.get();
+			modeLabel = localize('chatInput.mode.custom', "({0}), {1}", mode.mode, mode.argumentHint);
+		} else {
+			switch (this.currentModeKind) {
+				case ChatModeKind.Agent:
+					modeLabel = localize('chatInput.mode.agent', "(Agent), edit files in your workspace.");
+					break;
+				case ChatModeKind.Edit:
+					modeLabel = localize('chatInput.mode.edit', "(Edit), edit files in your workspace.");
+					break;
+				case ChatModeKind.Ask:
+				default:
+					modeLabel = localize('chatInput.mode.ask', "(Ask), ask questions or type / for topics.");
+					break;
+			}
 		}
 		if (verbose) {
 			return kbLabel