From 20c0ebe9277ba741107e686672ccbd6ba51d4a4f Mon Sep 17 00:00:00 2001
From: "vs-code-engineering[bot]"
 <122617954+vs-code-engineering[bot]@users.noreply.github.com>
Date: Fri, 17 Jul 2026 15:01:19 +0000
Subject: [PATCH] fix: mark Language model unavailable as expected chat error

---
 src/vs/workbench/api/common/extHostChatAgents2.ts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/vs/workbench/api/common/extHostChatAgents2.ts b/src/vs/workbench/api/common/extHostChatAgents2.ts
index a580f8cbc061b..558db5cfb26ad 100644
--- a/src/vs/workbench/api/common/extHostChatAgents2.ts
+++ b/src/vs/workbench/api/common/extHostChatAgents2.ts
@@ -946,7 +946,13 @@ export class ExtHostChatAgents2 extends Disposable implements ExtHostChatAgentsS
 		if (!model) {
 			model = await this._languageModels.getDefaultLanguageModel(extension);
 			if (!model) {
-				throw new Error('Language model unavailable');
+				// No language model is available (e.g. the user is not signed in or no models
+				// have been contributed). This is an expected operational condition, not a bug,
+				// so mark it as a `ChatExpectedError` to keep it out of `chatAgentError` telemetry
+				// while still surfacing the user-facing message.
+				const error = new Error('Language model unavailable');
+				error.name = 'ChatExpectedError';
+				throw error;
 			}
 		}