diff --git a/src/vs/workbench/api/common/extHostChatAgents2.ts b/src/vs/workbench/api/common/extHostChatAgents2.ts
index 7279fb1512e..9f3631f5a78 100644
--- a/src/vs/workbench/api/common/extHostChatAgents2.ts
+++ b/src/vs/workbench/api/common/extHostChatAgents2.ts
@@ -125,6 +125,7 @@ class ChatAgentResponseStream {
 				},
 				warning(value) {
 					throwIfDone(this.progress);
+					checkProposedApiEnabled(that._extension, 'chatParticipantAdditions');
 					const part = new extHostTypes.ChatResponseWarningPart(value);
 					const dto = typeConvert.ChatResponseWarningPart.from(part);
 					_report(dto);
@@ -184,7 +185,12 @@ class ChatAgentResponseStream {
 				push(part) {
 					throwIfDone(this.push);
 
-					if (part instanceof extHostTypes.ChatResponseTextEditPart || part instanceof extHostTypes.ChatResponseMarkdownWithVulnerabilitiesPart || part instanceof extHostTypes.ChatResponseDetectedParticipantPart) {
+					if (
+						part instanceof extHostTypes.ChatResponseTextEditPart ||
+						part instanceof extHostTypes.ChatResponseMarkdownWithVulnerabilitiesPart ||
+						part instanceof extHostTypes.ChatResponseDetectedParticipantPart ||
+						part instanceof extHostTypes.ChatResponseWarningPart
+					) {
 						checkProposedApiEnabled(that._extension, 'chatParticipantAdditions');
 					}
 
diff --git a/src/vs/workbench/api/common/extHostTypeConverters.ts b/src/vs/workbench/api/common/extHostTypeConverters.ts
index 66628dc8cca..d163386bf00 100644
--- a/src/vs/workbench/api/common/extHostTypeConverters.ts
+++ b/src/vs/workbench/api/common/extHostTypeConverters.ts
@@ -2455,7 +2455,7 @@ export namespace ChatResponseReferencePart {
 
 export namespace ChatResponsePart {
 
-	export function from(part: vscode.ChatResponsePart | vscode.ChatResponseTextEditPart | vscode.ChatResponseMarkdownWithVulnerabilitiesPart | vscode.ChatResponseDetectedParticipantPart, commandsConverter: CommandsConverter, commandDisposables: DisposableStore): extHostProtocol.IChatProgressDto {
+	export function from(part: vscode.ChatResponsePart | vscode.ChatResponseTextEditPart | vscode.ChatResponseMarkdownWithVulnerabilitiesPart | vscode.ChatResponseDetectedParticipantPart | vscode.ChatResponseWarningPart, commandsConverter: CommandsConverter, commandDisposables: DisposableStore): extHostProtocol.IChatProgressDto {
 		if (part instanceof types.ChatResponseMarkdownPart) {
 			return ChatResponseMarkdownPart.from(part);
 		} else if (part instanceof types.ChatResponseAnchorPart) {
@@ -2474,6 +2474,8 @@ export namespace ChatResponsePart {
 			return ChatResponseMarkdownWithVulnerabilitiesPart.from(part);
 		} else if (part instanceof types.ChatResponseDetectedParticipantPart) {
 			return ChatResponseDetectedParticipantPart.from(part);
+		} else if (part instanceof types.ChatResponseWarningPart) {
+			return ChatResponseWarningPart.from(part);
 		}
 
 		return {
diff --git a/src/vs/workbench/contrib/chat/common/chatModel.ts b/src/vs/workbench/contrib/chat/common/chatModel.ts
index 7b44235a3e7..7a7ffacd78e 100644
--- a/src/vs/workbench/contrib/chat/common/chatModel.ts
+++ b/src/vs/workbench/contrib/chat/common/chatModel.ts
@@ -226,8 +226,6 @@ export class Response implements IResponse {
 				return '';
 			} else if (part.kind === 'progressMessage') {
 				return '';
-			} else if (part.kind === 'warning') {
-				return '';
 			} else {
 				return part.content.value;
 			}