diff --git a/src/package.ts b/src/package.ts
index b0b95ea3..c005c2f2 100644
--- a/src/package.ts
+++ b/src/package.ts
@@ -675,7 +675,7 @@ export class TagsProcessor extends BaseProcessor {
 		const debuggers = doesContribute('debuggers') ? ['debuggers'] : [];
 		const json = doesContribute('jsonValidation') ? ['json'] : [];
 		const remoteMenu = doesContribute('menus', 'statusBar/remoteIndicator') ? ['remote-menu'] : [];
-		const chatParticipants = doesContribute('chatParticipants') ? ['chat-participant'] : [];
+		const chatParticipants = doesContribute('chatParticipants') ? ['chat-participant', 'copilot'] : [];
 
 		const localizationContributions = ((contributes && contributes['localizations']) ?? []).reduce<string[]>(
 			(r, l) => [...r, `lp-${l.languageId}`, ...toLanguagePackTags(l.translations, l.languageId)],
@@ -1636,7 +1636,7 @@ async function collectAllFiles(
 	cwd: string,
 	dependencies: 'npm' | 'yarn' | 'none' | undefined,
 	dependencyEntryPoints?: string[],
-	followSymlinks:boolean = true
+	followSymlinks: boolean = true
 ): Promise<string[]> {
 	const deps = await getDependencies(cwd, dependencies, dependencyEntryPoints);
 	const promises = deps.map(dep =>
@@ -1670,7 +1670,7 @@ function collectFiles(
 	ignoreFile?: string,
 	manifestFileIncludes?: string[],
 	readmePath?: string,
-	followSymlinks:boolean = false
+	followSymlinks: boolean = false
 ): Promise<string[]> {
 	readmePath = readmePath ?? 'README.md';
 	const notIgnored = ['!package.json', `!${readmePath}`];
diff --git a/src/test/package.test.ts b/src/test/package.test.ts
index ba18dac3..e020e0a6 100644
--- a/src/test/package.test.ts
+++ b/src/test/package.test.ts
@@ -1332,7 +1332,7 @@ describe('toVsixManifest', () => {
 			.then(result => assert.deepEqual(result.PackageManifest.Metadata[0].Tags[0], 'snippet,__web_extension'));
 	});
 
-	it('should automatically add chatParticipant tag', () => {
+	it('should automatically add chatParticipant and copilot tag', () => {
 		const manifest = {
 			name: 'test',
 			publisher: 'mocha',
@@ -1345,7 +1345,7 @@ describe('toVsixManifest', () => {
 
 		return _toVsixManifest(manifest, [])
 			.then(parseXmlManifest)
-			.then(result => assert.deepEqual(result.PackageManifest.Metadata[0].Tags[0], 'chat-participant,__web_extension'));
+			.then(result => assert.deepEqual(result.PackageManifest.Metadata[0].Tags[0], 'chat-participant,copilot,__web_extension'));
 	});
 
 	it('should remove duplicate tags', () => {