Add "developer: inspect chat model" action

src/vs/workbench/contrib/chat/browser/actions/chatDeveloperActions.ts

@@ -8,13 +8,15 @@ import { ServicesAccessor } from '../../../../../editor/browser/editorExtensions
 import { localize2 } from '../../../../../nls.js';
 import { Categories } from '../../../../../platform/action/common/actionCommonCategories.js';
 import { Action2, registerAction2 } from '../../../../../platform/actions/common/actions.js';
+import { IEditorService } from '../../../../services/editor/common/editorService.js';
 import { ChatContextKeys } from '../../common/actions/chatContextKeys.js';
 import { IChatService } from '../../common/chatService/chatService.js';
 import { IChatWidgetService } from '../chat.js';
 
 export function registerChatDeveloperActions() {
 	registerAction2(LogChatInputHistoryAction);
 	registerAction2(LogChatIndexAction);
+	registerAction2(InspectChatModelAction);
 }
 
 class LogChatInputHistoryAction extends Action2 {
@@ -56,3 +58,57 @@ class LogChatIndexAction extends Action2 {
 		chatService.logChatIndex();
 	}
 }
+
+class InspectChatModelAction extends Action2 {
+	static readonly ID = 'workbench.action.chat.inspectChatModel';
+
+	constructor() {
+		super({
+			id: InspectChatModelAction.ID,
+			title: localize2('workbench.action.chat.inspectChatModel.label', "Inspect Chat Model"),
+			icon: Codicon.inspect,
+			category: Categories.Developer,
+			f1: true,
+			precondition: ChatContextKeys.enabled
+		});
+	}
+
+	override async run(accessor: ServicesAccessor, ...args: unknown[]): Promise<void> {
+		const chatWidgetService = accessor.get(IChatWidgetService);
+		const editorService = accessor.get(IEditorService);
+		const widget = chatWidgetService.lastFocusedWidget;
+
+		if (!widget?.viewModel) {
+			return;
+		}
+
+		const model = widget.viewModel.model;
+		const modelData = model.toJSON();
+
+		// Build markdown output with latest response at the top
+		let output = '# Chat Model Inspection\n\n';
+
+		// Show latest response first if it exists
+		const requests = modelData.requests;
+		if (requests && requests.length > 0) {
+			const latestRequest = requests[requests.length - 1];
+			if (latestRequest.response) {
+				output += '## Latest Response\n\n';
+				output += '```json\n' + JSON.stringify(latestRequest.response, null, 2) + '\n```\n\n';
+			}
+		}
+
+		// Show full model data
+		output += '## Full Chat Model\n\n';
+		output += '```json\n' + JSON.stringify(modelData, null, 2) + '\n```\n';
+
+		await editorService.openEditor({
+			resource: undefined,
+			contents: output,
+			languageId: 'markdown',
+			options: {
+				pinned: true
+			}
+		});
+	}
+}

src/vs/workbench/contrib/chat/browser/widget/chatWidgetService.ts

@@ -231,6 +231,10 @@ export class ChatWidgetService extends Disposable implements IChatWidgetService
 		this._widgets.push(newWidget);
 		this._onDidAddWidget.fire(newWidget);
 
+		if (!this._lastFocusedWidget) {
+			this.setLastFocusedWidget(newWidget);
+		}
+
 		return combinedDisposable(
 			newWidget.onDidFocus(() => this.setLastFocusedWidget(newWidget)),
 			newWidget.onDidChangeViewModel(({ previousSessionResource, currentSessionResource }) => {
@@ -245,7 +249,12 @@ export class ChatWidgetService extends Disposable implements IChatWidgetService
 					}
 				});
 			}),
-			toDisposable(() => this._widgets.splice(this._widgets.indexOf(newWidget), 1))
+			toDisposable(() => {
+				this._widgets.splice(this._widgets.indexOf(newWidget), 1);
+				if (this._lastFocusedWidget === newWidget) {
+					this.setLastFocusedWidget(undefined);
+				}
+			})
 		);
 	}
 }