Prompt for sign in from the coding agent tool (#7626)

Part of #7614

Author: alexr00

src/github/copilotRemoteAgent.ts

@@ -263,9 +263,9 @@ export class CopilotRemoteAgentManager extends Disposable {
 		}
 	}
 
-	private async tryAcquireAuth(): Promise<FolderRepositoryManager | undefined> {
+	async tryAcquireAuth(): Promise<FolderRepositoryManager | undefined> {
 		if (this.credentialStore.isAnyAuthenticated()) {
-			return undefined;
+			return this.chooseFolderManager();
 		}
 
 		const result = await this.credentialStore.create({ createIfNone: { detail: vscode.l10n.t('Sign in to start delegating tasks to the GitHub coding agent.') } });
@@ -294,6 +294,9 @@ export class CopilotRemoteAgentManager extends Disposable {
 		}
 		const { userPrompt, summary, source, followup, _version } = args;
 		const fm = await this.tryAcquireAuth();
+		if (!fm) {
+			return;
+		}
 
 		/* __GDPR__
 			"remoteAgent.command.args" : {

src/lm/tools/copilotRemoteAgentTool.ts

@@ -30,14 +30,15 @@ export class CopilotRemoteAgentTool implements vscode.LanguageModelTool<CopilotR
 
 	async prepareInvocation(options: vscode.LanguageModelToolInvocationPrepareOptions<CopilotRemoteAgentToolParameters>): Promise<vscode.PreparedToolInvocation> {
 		const { title, existingPullRequest } = options.input;
+		const folderManager = existingPullRequest ? undefined : await this.manager.tryAcquireAuth();
 
 		// Check if the coding agent is available (enabled and assignable)
 		const isAvailable = await this.manager.isAvailable();
 		if (!isAvailable) {
 			throw new Error(vscode.l10n.t('Copilot coding agent is not available for this repository. Make sure the agent is enabled and assignable to this repository.'));
 		}
 
-		const targetRepo = await this.manager.repoInfo();
+		const targetRepo = await this.manager.repoInfo(folderManager);
 		const autoPushEnabled = this.manager.autoCommitAndPushEnabled;
 		const openPR = existingPullRequest || await this.getActivePullRequestWithSession(targetRepo);
 
@@ -67,7 +68,9 @@ export class CopilotRemoteAgentTool implements vscode.LanguageModelTool<CopilotR
 		const title = options.input.title;
 		const body = options.input.body || '';
 		const existingPullRequest = options.input.existingPullRequest || '';
-		const targetRepo = await this.manager.repoInfo();
+		const folderManager = existingPullRequest ? undefined : await this.manager.tryAcquireAuth();
+
+		const targetRepo = await this.manager.repoInfo(folderManager);
 		if (!targetRepo) {
 			return new vscode.LanguageModelToolResult([
 				new vscode.LanguageModelTextPart(vscode.l10n.t('No repository information found. Please open a workspace with a Git repository.'))