From f0f7fc47e7e5f7985fcf87f253a3b7532fc63a4c Mon Sep 17 00:00:00 2001
From: Colen Garoutte-Carson <coleng@microsoft.com>
Date: Mon, 14 Sep 2026 19:12:24 -0700
Subject: [PATCH 1/2] Add diagnostic tags

---
 Extension/src/LanguageServer/client.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Extension/src/LanguageServer/client.ts b/Extension/src/LanguageServer/client.ts
index ef459c05f..64eb18b91 100644
--- a/Extension/src/LanguageServer/client.ts
+++ b/Extension/src/LanguageServer/client.ts
@@ -293,6 +293,7 @@ interface IntelliSenseDiagnostic {
     severity: vscode.DiagnosticSeverity;
     localizeStringParams: LocalizeStringParams;
     relatedInformation?: IntelliSenseDiagnosticRelatedInformation[];
+    tags?: vscode.DiagnosticTag[];
 }
 
 interface RefactorDiagnostic {
@@ -2684,6 +2685,7 @@ export class DefaultClient implements Client {
             const diagnostic: vscode.Diagnostic = new vscode.Diagnostic(makeVscodeRange(d.range), message, d.severity);
             diagnostic.code = d.code;
             diagnostic.source = CppSourceStr;
+            diagnostic.tags = d.tags;
             if (d.relatedInformation) {
                 diagnostic.relatedInformation = [];
                 for (const info of d.relatedInformation) {

From c4ff532c78ab51670290fb5f5976a6cc50008b65 Mon Sep 17 00:00:00 2001
From: Colen Garoutte-Carson <coleng@microsoft.com>
Date: Tue, 15 Sep 2026 19:33:48 -0700
Subject: [PATCH 2/2] Add settings

---
 Extension/src/LanguageServer/client.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Extension/src/LanguageServer/client.ts b/Extension/src/LanguageServer/client.ts
index 64eb18b91..16598927c 100644
--- a/Extension/src/LanguageServer/client.ts
+++ b/Extension/src/LanguageServer/client.ts
@@ -532,6 +532,7 @@ interface CppInitializationParams {
     vcpkgRoot: string;
     intelliSenseCacheDisabled: boolean;
     caseSensitiveFileSupport: boolean;
+    supportsDiagnosticTags: boolean;
     resetDatabase: boolean;
     edgeMessagesDirectory: string;
     localizedStrings: string[];
@@ -1746,6 +1747,7 @@ export class DefaultClient implements Client {
             vcpkgRoot: util.getVcpkgRoot(),
             intelliSenseCacheDisabled: intelliSenseCacheDisabled,
             caseSensitiveFileSupport: workspaceSettings.isCaseSensitiveFileSupportEnabled,
+            supportsDiagnosticTags: true,
             resetDatabase: resetDatabase,
             edgeMessagesDirectory: path.join(util.getExtensionFilePath("bin"), "messages", getLocaleId()),
             localizedStrings: localizedStrings,