diff --git a/chat-sample/package.json b/chat-sample/package.json
index 691458ed..fb3a97d5 100644
--- a/chat-sample/package.json
+++ b/chat-sample/package.json
@@ -52,7 +52,8 @@
                 },
                 "supportedContentTypes": [
                     "text/plain"
-                ]
+                ],
+                "requiresConfirmation": true
             },
             {
                 "id": "chat-sample_catVoice",
diff --git a/chat-sample/src/extension.ts b/chat-sample/src/extension.ts
index 91510bcd..b18e68de 100644
--- a/chat-sample/src/extension.ts
+++ b/chat-sample/src/extension.ts
@@ -21,6 +21,7 @@ function registerChatTool(context: vscode.ExtensionContext) {
 
             return result;
         },
+        provideToolInvocationMessage: async () => 'Speaking in the voice of a cat',
     }));
 
     interface ITabCountParameters {
@@ -29,6 +30,7 @@ function registerChatTool(context: vscode.ExtensionContext) {
 
     context.subscriptions.push(vscode.lm.registerTool('chat-sample_tabCount', {
         async invoke(options, token) {
+            await new Promise(resolve => setTimeout(resolve, 5000));
             const params = options.parameters as ITabCountParameters;
             if (typeof params.tabGroup === 'number') {
                 const group = vscode.window.tabGroups.all[Math.max(params.tabGroup - 1, 0)];
@@ -39,6 +41,14 @@ function registerChatTool(context: vscode.ExtensionContext) {
                 return { 'text/plain': `There are ${group.tabs.length} tabs open.` };
             }
         },
+        provideToolInvocationMessage: async () => 'Counting the number of tabs',
+        provideToolConfirmationMessages: async (options) => {
+            const params = options.parameters as ITabCountParameters;
+            return { 
+                title: 'Count the number of open tabs', 
+                message: new vscode.MarkdownString(`${options.participantName} will count the number of **open tabs**` + (params.tabGroup !== undefined ? ` in tab group ${params.tabGroup}` : '')) 
+            };
+        }
     }));
 }
 
@@ -56,7 +66,7 @@ function registerChatParticipant(context: vscode.ExtensionContext) {
         });
 
         const model = models[0];
-        stream.markdown(`Available tools: ${vscode.lm.tools.map(tool => tool.id).join(', ')}\n\n`);
+        // stream.markdown(`Available tools: ${vscode.lm.tools.map(tool => tool.id).join(', ')}\n\n`);
 
         const allTools = vscode.lm.tools.map((tool): vscode.LanguageModelChatTool => {
             return {
@@ -106,7 +116,6 @@ function registerChatParticipant(context: vscode.ExtensionContext) {
                         throw new Error(`Got invalid tool use parameters: "${part.parameters}". (${(err as Error).message})`);
                     }
 
-                    stream.progress(`Calling tool: ${tool.id} with ${part.parameters}`);
                     // TODO support prompt-tsx here
                     const requestedContentType = 'text/plain';
                     toolCalls.push({
diff --git a/chat-sample/vscode.proposed.lmTools.d.ts b/chat-sample/vscode.proposed.lmTools.d.ts
index 43749d8a..89175362 100644
--- a/chat-sample/vscode.proposed.lmTools.d.ts
+++ b/chat-sample/vscode.proposed.lmTools.d.ts
@@ -166,9 +166,28 @@ declare module 'vscode' {
 		supportedContentTypes: string[];
 	}
 
+	export interface LanguageModelToolProvideConfirmationMessageOptions {
+		participantName: string;
+		parameters: any;
+	}
+
+	export interface LanguageModelToolConfirmationMessages {
+		title: string;
+		message: string | MarkdownString;
+	}
+
 	export interface LanguageModelTool {
-		// TODO@API should it be LanguageModelToolResult | string?
 		invoke(options: LanguageModelToolInvocationOptions, token: CancellationToken): ProviderResult<LanguageModelToolResult>;
+
+		/**
+		 * This can be implemented to customize the message shown to the user when a tool requires confirmation.
+		 */
+		provideToolConfirmationMessages?(options: LanguageModelToolProvideConfirmationMessageOptions, token: CancellationToken): Thenable<LanguageModelToolConfirmationMessages>;
+
+		/**
+		 * This message will be shown with the progress notification when the tool is invoked in a chat session.
+		 */
+		provideToolInvocationMessage?(parameters: any, token: CancellationToken): Thenable<string>;
 	}
 
 	export interface ChatLanguageModelToolReference {