diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 35feebc..8bcc588 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,6 +17,8 @@ jobs:
         run: bun install --frozen-lockfile
       - name: Check tool count drift
         run: bun run scripts/check-tool-count.ts
+      - name: Test
+        run: bun test
       - name: Build
         run: bun run build
       - name: Lint
diff --git a/src/tool-configs.ts b/src/tool-configs.ts
index 03fabd9..8255e57 100644
--- a/src/tool-configs.ts
+++ b/src/tool-configs.ts
@@ -72,7 +72,7 @@ function cliExists(name: string): boolean {
 	return false;
 }
 
-const VSCODE_VARIANTS = ["Code", "Code - Insiders", "Cursor", "VSCodium", "Windsurf"];
+const VSCODE_VARIANTS = ["Code", "Code - Insiders", "Cursor", "Cursor Nightly", "VSCodium", "Windsurf", "Windsurf Next", "Trae", "Void", "Positron"];
 
 function vscodeExtensionStorageExists(extensionId: string): boolean {
 	let bases: string[];
diff --git a/tests/tool-configs.test.ts b/tests/tool-configs.test.ts
new file mode 100644
index 0000000..9f82eea
--- /dev/null
+++ b/tests/tool-configs.test.ts
@@ -0,0 +1,59 @@
+import { beforeAll, describe, expect, mock, test } from "bun:test";
+
+let activeVariant = "";
+let activeExtensionId = "";
+
+mock.module("os", () => ({
+	homedir: () => "/home/agentfiles-test",
+	platform: () => "linux",
+}));
+
+mock.module("fs", () => ({
+	existsSync: (path: unknown) => {
+		const normalized = String(path).replaceAll("\\", "/");
+		return normalized.endsWith(
+			`/${activeVariant}/User/globalStorage/${activeExtensionId}`,
+		);
+	},
+	readdirSync: () => [],
+}));
+
+let toolConfigs: typeof import("../src/tool-configs");
+
+beforeAll(async () => {
+	toolConfigs = await import("../src/tool-configs");
+});
+
+const VSCODE_VARIANTS = [
+	"Code",
+	"Code - Insiders",
+	"Cursor",
+	"Cursor Nightly",
+	"VSCodium",
+	"Windsurf",
+	"Windsurf Next",
+	"Trae",
+	"Void",
+	"Positron",
+] as const;
+
+const VSCODE_EXTENSION_TOOLS = [
+	{ id: "cline", extensionId: "saoudrizwan.claude-dev" },
+	{ id: "roo-code", extensionId: "RooVeterinaryInc.roo-cline" },
+] as const;
+
+describe("VS Code fork extension storage detection", () => {
+	for (const variant of VSCODE_VARIANTS) {
+		test(`detects extension-backed tools in ${variant}`, () => {
+			for (const tool of VSCODE_EXTENSION_TOOLS) {
+				activeVariant = variant;
+				activeExtensionId = tool.extensionId;
+				toolConfigs.clearInstallCache();
+
+				const config = toolConfigs.TOOL_CONFIGS.find(({ id }) => id === tool.id);
+				expect(config).toBeDefined();
+				expect(config?.isInstalled()).toBe(true);
+			}
+		});
+	}
+});