diff --git a/src/vs/workbench/contrib/chat/browser/agentSessions/agentSessionsModel.ts b/src/vs/workbench/contrib/chat/browser/agentSessions/agentSessionsModel.ts
index e7176d38ef6..9757d370d55 100644
--- a/src/vs/workbench/contrib/chat/browser/agentSessions/agentSessionsModel.ts
+++ b/src/vs/workbench/contrib/chat/browser/agentSessions/agentSessionsModel.ts
@@ -426,9 +426,9 @@ export class AgentSessionsModel extends Disposable implements IAgentSessionsMode
 	private registerListeners(): void {
 
 		// Sessions changes
-		this._register(this.chatSessionsService.onDidChangeItemsProviders(({ chatSessionType: provider }) => this.resolve(provider)));
+		this._register(this.chatSessionsService.onDidChangeItemsProviders(({ chatSessionType }) => this.resolve(chatSessionType)));
 		this._register(this.chatSessionsService.onDidChangeAvailability(() => this.resolve(undefined)));
-		this._register(this.chatSessionsService.onDidChangeSessionItems(provider => this.resolve(provider)));
+		this._register(this.chatSessionsService.onDidChangeSessionItems(({ chatSessionType }) => this.resolve(chatSessionType)));
 
 		// State
 		this._register(this.storageService.onWillSaveState(() => {
diff --git a/src/vs/workbench/contrib/chat/browser/agentSessions/localAgentSessionsProvider.ts b/src/vs/workbench/contrib/chat/browser/agentSessions/localAgentSessionsProvider.ts
index 985cc88e959..14bd1a005fc 100644
--- a/src/vs/workbench/contrib/chat/browser/agentSessions/localAgentSessionsProvider.ts
+++ b/src/vs/workbench/contrib/chat/browser/agentSessions/localAgentSessionsProvider.ts
@@ -52,8 +52,8 @@ export class LocalAgentsSessionsProvider extends Disposable implements IChatSess
 			() => this._onDidChangeChatSessionItems.fire()
 		));
 
-		this._register(this.chatSessionsService.onDidChangeSessionItems(sessionType => {
-			if (sessionType === this.chatSessionType) {
+		this._register(this.chatSessionsService.onDidChangeSessionItems(({ chatSessionType }) => {
+			if (chatSessionType === this.chatSessionType) {
 				this._onDidChange.fire();
 			}
 		}));
diff --git a/src/vs/workbench/contrib/chat/browser/chatSessions/chatSessions.contribution.ts b/src/vs/workbench/contrib/chat/browser/chatSessions/chatSessions.contribution.ts
index d67e1a23322..3bef1b718b9 100644
--- a/src/vs/workbench/contrib/chat/browser/chatSessions/chatSessions.contribution.ts
+++ b/src/vs/workbench/contrib/chat/browser/chatSessions/chatSessions.contribution.ts
@@ -259,11 +259,11 @@ export class ChatSessionsService extends Disposable implements IChatSessionsServ
 	private readonly _alternativeIdMap: Map</* alternativeId */ string, /* primaryType */ string> = new Map();
 	private readonly _contextKeys = new Set<string>();
 
-	private readonly _onDidChangeItemsProviders = this._register(new Emitter<IChatSessionItemProvider>());
-	readonly onDidChangeItemsProviders: Event<IChatSessionItemProvider> = this._onDidChangeItemsProviders.event;
+	private readonly _onDidChangeItemsProviders = this._register(new Emitter<{ readonly chatSessionType: string }>());
+	readonly onDidChangeItemsProviders = this._onDidChangeItemsProviders.event;
 
-	private readonly _onDidChangeSessionItems = this._register(new Emitter<string>());
-	readonly onDidChangeSessionItems: Event<string> = this._onDidChangeSessionItems.event;
+	private readonly _onDidChangeSessionItems = this._register(new Emitter<{ readonly chatSessionType: string }>());
+	readonly onDidChangeSessionItems = this._onDidChangeSessionItems.event;
 
 	private readonly _onDidChangeAvailability = this._register(new Emitter<void>());
 	readonly onDidChangeAvailability: Event<void> = this._onDidChangeAvailability.event;
@@ -339,7 +339,7 @@ export class ChatSessionsService extends Disposable implements IChatSessionsServ
 			}
 		}));
 
-		this._register(this.onDidChangeSessionItems(chatSessionType => {
+		this._register(this.onDidChangeSessionItems(({ chatSessionType }) => {
 			this.updateInProgressStatus(chatSessionType).catch(error => {
 				this._logService.warn(`Failed to update progress status for '${chatSessionType}':`, error);
 			});
@@ -637,7 +637,7 @@ export class ChatSessionsService extends Disposable implements IChatSessionsServ
 				this._onDidChangeItemsProviders.fire(provider);
 			}
 			for (const { contribution } of this._contributions.values()) {
-				this._onDidChangeSessionItems.fire(contribution.type);
+				this._onDidChangeSessionItems.fire({ chatSessionType: contribution.type });
 			}
 		}
 		this._updateHasCanDelegateProvidersContextKey();
@@ -828,7 +828,7 @@ export class ChatSessionsService extends Disposable implements IChatSessionsServ
 
 		const disposables = new DisposableStore();
 		disposables.add(provider.onDidChangeChatSessionItems(() => {
-			this._onDidChangeSessionItems.fire(chatSessionType);
+			this._onDidChangeSessionItems.fire({ chatSessionType });
 		}));
 
 		this.updateInProgressStatus(chatSessionType).catch(error => {
@@ -1010,7 +1010,7 @@ export class ChatSessionsService extends Disposable implements IChatSessionsServ
 	}
 
 	public notifySessionItemsChanged(chatSessionType: string): void {
-		this._onDidChangeSessionItems.fire(chatSessionType);
+		this._onDidChangeSessionItems.fire({ chatSessionType });
 	}
 
 	/**
diff --git a/src/vs/workbench/contrib/chat/common/chatSessionsService.ts b/src/vs/workbench/contrib/chat/common/chatSessionsService.ts
index ac53b31a898..871c9e3ade0 100644
--- a/src/vs/workbench/contrib/chat/common/chatSessionsService.ts
+++ b/src/vs/workbench/contrib/chat/common/chatSessionsService.ts
@@ -206,8 +206,8 @@ export interface IChatSessionsService {
 	readonly _serviceBrand: undefined;
 
 	// #region Chat session item provider support
-	readonly onDidChangeItemsProviders: Event<IChatSessionItemProvider>;
-	readonly onDidChangeSessionItems: Event<string>;
+	readonly onDidChangeItemsProviders: Event<{ readonly chatSessionType: string }>;
+	readonly onDidChangeSessionItems: Event<{ readonly chatSessionType: string }>;
 
 	readonly onDidChangeAvailability: Event<void>;
 	readonly onDidChangeInProgress: Event<void>;
diff --git a/src/vs/workbench/contrib/chat/test/common/mockChatSessionsService.ts b/src/vs/workbench/contrib/chat/test/common/mockChatSessionsService.ts
index 80e7de23580..73d80c7f11b 100644
--- a/src/vs/workbench/contrib/chat/test/common/mockChatSessionsService.ts
+++ b/src/vs/workbench/contrib/chat/test/common/mockChatSessionsService.ts
@@ -19,10 +19,10 @@ export class MockChatSessionsService implements IChatSessionsService {
 
 	private readonly _onDidChangeSessionOptions = new Emitter<URI>();
 	readonly onDidChangeSessionOptions = this._onDidChangeSessionOptions.event;
-	private readonly _onDidChangeItemsProviders = new Emitter<IChatSessionItemProvider>();
+	private readonly _onDidChangeItemsProviders = new Emitter<{ readonly chatSessionType: string }>();
 	readonly onDidChangeItemsProviders = this._onDidChangeItemsProviders.event;
 
-	private readonly _onDidChangeSessionItems = new Emitter<string>();
+	private readonly _onDidChangeSessionItems = new Emitter<{ readonly chatSessionType: string }>();
 	readonly onDidChangeSessionItems = this._onDidChangeSessionItems.event;
 
 	private readonly _onDidChangeAvailability = new Emitter<void>();
@@ -54,7 +54,7 @@ export class MockChatSessionsService implements IChatSessionsService {
 	}
 
 	fireDidChangeSessionItems(chatSessionType: string): void {
-		this._onDidChangeSessionItems.fire(chatSessionType);
+		this._onDidChangeSessionItems.fire({ chatSessionType });
 	}
 
 	fireDidChangeAvailability(): void {
@@ -168,7 +168,7 @@ export class MockChatSessionsService implements IChatSessionsService {
 	}
 
 	notifySessionItemsChanged(chatSessionType: string): void {
-		this._onDidChangeSessionItems.fire(chatSessionType);
+		this._onDidChangeSessionItems.fire({ chatSessionType });
 	}
 
 	getSessionOption(sessionResource: URI, optionId: string): string | undefined {