Don't reset mode to Edit if Agent participant has not loaded yet (#245931)

Fix microsoft/vscode-copilot-release#7379

Author: roblourens

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

@@ -404,12 +404,6 @@ export class ChatInputPart extends Disposable implements IHistoryNavigationWidge
 		});
 
 		this.initSelectedModel();
-
-		this._register(agentService.onDidChangeAgents(() => {
-			if (!agentService.hasToolsAgent && this._currentMode === ChatMode.Agent) {
-				this.setChatMode(ChatMode.Edit);
-			}
-		}));
 	}
 
 	private getSelectedModelStorageKey(): string {
@@ -469,10 +463,6 @@ export class ChatInputPart extends Disposable implements IHistoryNavigationWidge
 		}
 
 		mode = validateChatMode(mode) ?? (this.location === ChatAgentLocation.Panel ? ChatMode.Ask : ChatMode.Edit);
-		if (mode === ChatMode.Agent && !this.agentService.hasToolsAgent) {
-			mode = ChatMode.Edit;
-		}
-
 		this._currentMode = mode;
 		this.chatMode.set(mode);
 		this._onDidChangeCurrentChatMode.fire();
@@ -714,6 +704,12 @@ export class ChatInputPart extends Disposable implements IHistoryNavigationWidge
 		}
 	}
 
+	validateCurrentMode(): void {
+		if (!this.agentService.hasToolsAgent && this._currentMode === ChatMode.Agent) {
+			this.setChatMode(ChatMode.Edit);
+		}
+	}
+
 	// A funtion that filters out specifically the `value` property of the attachment.
 	private getFilteredEntry(query: string, inputState: IChatInputState): IChatHistoryEntry {
 		const attachmentsWithoutImageValues = inputState.chatContextAttachments?.map(attachment => {

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

@@ -1143,6 +1143,7 @@ export class ChatWidget extends Disposable implements IChatWidget {
 
 			this.chatService.cancelCurrentRequestForSession(this.viewModel.sessionId);
 
+			this.input.validateCurrentMode();
 			const result = await this.chatService.sendRequest(this.viewModel.sessionId, input, {
 				mode: this.inputPart.currentMode,
 				userSelectedModelId: this.inputPart.currentLanguageModel,