Initial analysis: understand issue with branch switching when useBranchForIssues is off

Co-authored-by: alexr00 <38270282+alexr00@users.noreply.github.com>

Author: Copilot

src/@types/vscode.proposed.chatParticipantAdditions.d.ts

@@ -646,7 +646,13 @@ declare module 'vscode' {
 	}
 
 	export interface ChatRequest {
-		modeInstructions?: string;
-		modeInstructionsToolReferences?: readonly ChatLanguageModelToolReference[];
+		readonly modeInstructions?: string;
+		readonly modeInstructions2?: ChatRequestModeInstructions;
+	}
+
+	export interface ChatRequestModeInstructions {
+		readonly content: string;
+		readonly toolReferences?: readonly ChatLanguageModelToolReference[];
+		readonly metadata?: Record<string, boolean | string | number>;
 	}
 }

src/@types/vscode.proposed.chatParticipantPrivate.d.ts

@@ -187,6 +187,8 @@ declare module 'vscode' {
 
 		isQuotaExceeded?: boolean;
 
+		isRateLimited?: boolean;
+
 		level?: ChatErrorLevel;
 
 		code?: string;
@@ -239,6 +241,7 @@ declare module 'vscode' {
 	export class ExtendedLanguageModelToolResult extends LanguageModelToolResult {
 		toolResultMessage?: string | MarkdownString;
 		toolResultDetails?: Array<Uri | Location>;
+		toolMetadata?: unknown;
 	}
 
 	// #region Chat participant detection