Stop counting browsers that are being driven by a script

src/__tests__/funnel.test.ts

@@ -13,14 +13,14 @@
  * worth more than any metric.
  */
 
 const beaconMock = vi.fn((_url: string, _body: unknown) => true);
 
 beforeEach(() => {
   trackMock.mockClear();
   beaconMock.mockClear();
   vi.unstubAllEnvs();
   vi.stubEnv("NEXT_PUBLIC_VERCEL_ENV", "production");
-  vi.stubGlobal("navigator", { sendBeacon: beaconMock });
+  vi.stubGlobal("navigator", { sendBeacon: beaconMock, webdriver: false });
   vi.stubGlobal("Blob", class { constructor(public parts: string[]) {} text() { return this.parts.join(""); } });
 });
 
@@ -79,6 +79,25 @@
   });
 });
 
+describe("a browser being driven by a script is not a visitor", () => {
+  it("counts nothing when navigator.webdriver is set", () => {
+    // Our own headless checks opened the editor 12 times in one afternoon, and every one
+    // of them counted. The first numbers anybody read were mostly us.
+    vi.stubGlobal("navigator", { sendBeacon: beaconMock, webdriver: true });
+    countEditorOpened("kept");
+    countFirstEdit();
+    countExportStarted();
+    countExportFinished();
+    expect(trackMock).not.toHaveBeenCalled();
+    expect(beaconMock).not.toHaveBeenCalled();
+  });
+
+  it("still counts an ordinary browser", () => {
+    countEditorOpened("kept");
+    expect(beaconMock).toHaveBeenCalled();
+  });
+});
+
 describe("it cannot carry a person's work, even by accident", () => {
   it("sends a template slug only when it looks like one", () => {
     countEditorOpened("Our Clinic's Private Draft, 2026");

src/lib/funnel.ts

@@ -22,8 +22,21 @@ const MAX_EXPORT_MS = 600_000;
  */
 let exportStartedAt: number | null = null;
 
+/**
+ * A browser being driven by a script.
+ *
+ * Set by every automation framework and by Chrome's own remote debugging. Our headless
+ * checks opened the editor a dozen times in one afternoon and all of it counted, so the
+ * first real numbers were mostly us. A visitor who finishes a site is the whole point of
+ * these counts, and a robot never does.
+ */
+function driven(): boolean {
+  return typeof navigator !== "undefined" && navigator.webdriver === true;
+}
+
 function send(name: FunnelEvent, properties?: Record<string, string | number>): void {
   if (!process.env.NEXT_PUBLIC_VERCEL_ENV) return;
+  if (driven()) return;
   try {
     track(name, properties);
   } catch {