diff --git a/chat-sample/package.json b/chat-sample/package.json
index c914ff232..4d25b65db 100644
--- a/chat-sample/package.json
+++ b/chat-sample/package.json
@@ -9,7 +9,7 @@
     },
     "version": "0.1.0",
     "engines": {
-        "vscode": "^1.86.0"
+        "vscode": "^1.88.0"
     },
     "extensionDependencies": [
         "github.copilot-chat"
@@ -17,20 +17,34 @@
     "categories": [
         "Other"
     ],
-    "activationEvents": [
-        "onStartupFinished"
-    ],
+    "activationEvents": [ ],
     "enabledApiProposals": [
         "chatParticipant",
-		"chatVariableResolver",
+        "chatVariableResolver",
         "languageModels"
     ],
     "contributes": {
+        "chatParticipants": [
+            {
+                "name": "cat",
+                "description": "Meow! What can I teach you?",
+                "commands": [
+                    {
+                        "name": "teach",
+                        "description": "Pick at random a computer science concept then explain it in purfect way of a cat"
+                    },
+                    {
+                        "name": "play",
+                        "description": "Do whatever you want, you are a cat after all"
+                    }
+                ]
+            }
+        ],
         "commands": [
-          {
-            "command": "cat.namesInEditor",
-            "title": "Use Cat Names in Editor"
-          }
+            {
+                "command": "cat.namesInEditor",
+                "title": "Use Cat Names in Editor"
+            }
         ]
     },
     "main": "./out/extension.js",
diff --git a/chat-sample/src/extension.ts b/chat-sample/src/extension.ts
index fd4efa821..f159b8ace 100644
--- a/chat-sample/src/extension.ts
+++ b/chat-sample/src/extension.ts
@@ -71,16 +71,6 @@ export function activate(context: vscode.ExtensionContext) {
     const cat = vscode.chat.createChatParticipant(CAT_PARTICIPANT_NAME, handler);
     cat.isSticky = true; // Cat is persistant, whenever a user starts interacting with @cat, @cat will automatically be added to the following messages
     cat.iconPath = vscode.Uri.joinPath(context.extensionUri, 'cat.jpeg');
-    cat.description = vscode.l10n.t('Meow! What can I teach you?');
-    cat.commandProvider = {
-        provideCommands(token) {
-            return [
-                { name: 'teach', description: 'Pick at random a computer science concept then explain it in purfect way of a cat' },
-                { name: 'play', description: 'Do whatever you want, you are a cat after all' }
-            ];
-        }
-    };
-
     cat.followupProvider = {
         provideFollowups(result: ICatChatResult, token: vscode.CancellationToken) {
             return [{
diff --git a/chat-sample/src/vscode.proposed.chatParticipant.d.ts b/chat-sample/src/vscode.proposed.chatParticipant.d.ts
index 5fcc77cb7..b6794145d 100644
--- a/chat-sample/src/vscode.proposed.chatParticipant.d.ts
+++ b/chat-sample/src/vscode.proposed.chatParticipant.d.ts
@@ -143,49 +143,6 @@ declare module 'vscode' {
 		readonly kind: ChatResultFeedbackKind;
 	}
 
-	export interface ChatCommand {
-		/**
-		 * A short name by which this command is referred to in the UI, e.g. `fix` or
-		 * `explain` for commands that fix an issue or explain code.
-		 *
-		 * **Note**: The name should be unique among the commands provided by this participant.
-		 */
-		readonly name: string;
-
-		/**
-		 * Human-readable description explaining what this command does.
-		 */
-		readonly description: string;
-
-		/**
-		 * When the user clicks this command in `/help`, this text will be submitted to this command
-		 */
-		readonly sampleRequest?: string;
-
-		/**
-		 * Whether executing the command puts the chat into a persistent mode, where the command is automatically added to the chat input for the next message.
-		 */
-		readonly isSticky?: boolean;
-	}
-
-	/**
-	 * A ChatCommandProvider returns {@link ChatCommands commands} that can be invoked on a chat participant using `/`. For example, `@participant /command`.
-	 * These can be used as shortcuts to let the user explicitly invoke different functionalities provided by the participant.
-	 */
-	export interface ChatCommandProvider {
-		/**
-		 * Returns a list of commands that its participant is capable of handling. A command
-		 * can be selected by the user and will then be passed to the {@link ChatRequestHandler handler}
-		 * via the {@link ChatRequest.command command} property.
-		 *
-		 *
-		 * @param token A cancellation token.
-		 * @returns A list of commands. The lack of a result can be signaled by returning `undefined`, `null`, or
-		 * an empty array.
-		 */
-		provideCommands(context: ChatContext, token: CancellationToken): ProviderResult<ChatCommand[]>;
-	}
-
 	/**
 	 * A followup question suggested by the participant.
 	 */
@@ -239,11 +196,6 @@ declare module 'vscode' {
 		 */
 		readonly name: string;
 
-		/**
-		 * A human-readable description explaining what this participant does.
-		 */
-		description?: string;
-
 		/**
 		 * Icon for the participant shown in UI.
 		 */
@@ -263,11 +215,6 @@ declare module 'vscode' {
 		 */
 		requestHandler: ChatRequestHandler;
 
-		/**
-		 * This provider will be called to retrieve the participant's commands.
-		 */
-		commandProvider?: ChatCommandProvider;
-
 		/**
 		 * This provider will be called once after each request to retrieve suggested followup questions.
 		 */