diff --git a/extensions/google/oauth.local-login.test.ts b/extensions/google/oauth.local-login.test.ts
new file mode 100644
index 000000000000..626bec4390bb
--- /dev/null
+++ b/extensions/google/oauth.local-login.test.ts
@@ -0,0 +1,69 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+const AUTH_URL = "https://accounts.google.com/o/oauth2/v2/auth?state=state-123";
+
+const exchangeCodeForTokensMock = vi.hoisted(() =>
+  vi.fn(async () => ({
+    access: "access-token",
+    refresh: "refresh-token",
+    expires: 123,
+  })),
+);
+const waitForLocalCallbackMock = vi.hoisted(() =>
+  vi.fn(async () => ({ code: "oauth-code", state: "state-123" })),
+);
+
+vi.mock("./oauth.flow.js", () => ({
+  buildAuthUrl: () => AUTH_URL,
+  generateOAuthState: () => "state-123",
+  generatePkce: () => ({ challenge: "pkce-challenge", verifier: "pkce-verifier" }),
+  parseCallbackInput: vi.fn(),
+  shouldUseManualOAuthFlow: (isRemote: boolean) => isRemote,
+  waitForLocalCallback: waitForLocalCallbackMock,
+}));
+
+vi.mock("./oauth.token.js", () => ({
+  exchangeCodeForTokens: exchangeCodeForTokensMock,
+}));
+
+describe("loginGeminiCliOAuth local browser flow", () => {
+  beforeEach(() => {
+    exchangeCodeForTokensMock.mockClear();
+    waitForLocalCallbackMock.mockClear();
+  });
+
+  it("prints the auth URL before attempting best-effort browser launch", async () => {
+    const events: string[] = [];
+    const { loginGeminiCliOAuth } = await import("./oauth.js");
+    const openUrl = vi.fn(async () => {
+      events.push("open");
+    });
+    const log = vi.fn((message: string) => {
+      events.push(`log:${message}`);
+    });
+
+    const result = await loginGeminiCliOAuth({
+      isRemote: false,
+      openUrl,
+      log,
+      note: async () => {},
+      prompt: async () => "",
+      progress: { update: () => {}, stop: () => {} },
+    });
+
+    expect(result).toEqual({
+      access: "access-token",
+      refresh: "refresh-token",
+      expires: 123,
+    });
+    expect(log).toHaveBeenCalledWith(expect.stringContaining(AUTH_URL));
+    expect(openUrl).toHaveBeenCalledWith(AUTH_URL);
+    expect(events.findIndex((event) => event.startsWith("log:"))).toBeLessThan(
+      events.indexOf("open"),
+    );
+    expect(waitForLocalCallbackMock).toHaveBeenCalledWith(
+      expect.objectContaining({ expectedState: "state-123" }),
+    );
+    expect(exchangeCodeForTokensMock).toHaveBeenCalledWith("oauth-code", "pkce-verifier");
+  });
+});
diff --git a/extensions/google/oauth.ts b/extensions/google/oauth.ts
index d816067048b4..4461567e60ea 100644
--- a/extensions/google/oauth.ts
+++ b/extensions/google/oauth.ts
@@ -42,10 +42,11 @@ export async function loginGeminiCliOAuth(
   }
 
   ctx.progress.update("Complete sign-in in browser...");
+  ctx.log(`\nOpen this URL in your browser:\n\n${authUrl}\n`);
   try {
     await ctx.openUrl(authUrl);
   } catch {
-    ctx.log(`\nOpen this URL in your browser:\n\n${authUrl}\n`);
+    // The URL is already visible; browser launch is best-effort.
   }
 
   try {