diff --git a/extensions/google-meet/node-host.test.ts b/extensions/google-meet/node-host.test.ts
index c9fdf06a7b33..35f9029632cc 100644
--- a/extensions/google-meet/node-host.test.ts
+++ b/extensions/google-meet/node-host.test.ts
@@ -63,6 +63,33 @@ describe("google-meet node host bridge sessions", () => {
     );
   });
 
+  it("rejects non-Meet start URLs before local Chrome side effects", async () => {
+    const originalPlatform = process.platform;
+    children.length = 0;
+    vi.mocked(spawnSync).mockClear();
+
+    Object.defineProperty(process, "platform", { configurable: true, value: "darwin" });
+    try {
+      await expect(
+        handleGoogleMeetNodeHostCommand(
+          JSON.stringify({
+            action: "start",
+            url: "https://example.com/private-call",
+            mode: "realtime",
+            launch: true,
+            audioInputCommand: ["mock-rec"],
+            audioOutputCommand: ["mock-play"],
+          }),
+        ),
+      ).rejects.toThrow("url must be an explicit https://meet.google.com/... URL");
+
+      expect(spawnSync).not.toHaveBeenCalled();
+      expect(children).toHaveLength(0);
+    } finally {
+      Object.defineProperty(process, "platform", { configurable: true, value: originalPlatform });
+    }
+  });
+
   it("starts observe-only Chrome without BlackHole or bridge processes", async () => {
     const originalPlatform = process.platform;
     children.length = 0;
diff --git a/extensions/google-meet/src/meet-url.ts b/extensions/google-meet/src/meet-url.ts
new file mode 100644
index 000000000000..12878117b825
--- /dev/null
+++ b/extensions/google-meet/src/meet-url.ts
@@ -0,0 +1,29 @@
+// Google Meet plugin module implements shared Meet URL contracts.
+
+function normalizeOptionalString(value: unknown): string | undefined {
+  if (typeof value !== "string") {
+    return undefined;
+  }
+  const trimmed = value.trim();
+  return trimmed || undefined;
+}
+
+export function normalizeMeetUrl(input: unknown): string {
+  const raw = normalizeOptionalString(input);
+  if (!raw) {
+    throw new Error("url required");
+  }
+  let url: URL;
+  try {
+    url = new URL(raw);
+  } catch {
+    throw new Error("url must be a valid Google Meet URL");
+  }
+  if (url.protocol !== "https:" || url.hostname.toLowerCase() !== "meet.google.com") {
+    throw new Error("url must be an explicit https://meet.google.com/... URL");
+  }
+  if (!/^\/[a-z]{3}-[a-z]{4}-[a-z]{3}(?:$|[/?#])/i.test(url.pathname)) {
+    throw new Error("url must include a Google Meet meeting code");
+  }
+  return url.toString();
+}
diff --git a/extensions/google-meet/src/node-host.ts b/extensions/google-meet/src/node-host.ts
index 2cdb84163269..cc92e7a0107e 100644
--- a/extensions/google-meet/src/node-host.ts
+++ b/extensions/google-meet/src/node-host.ts
@@ -6,6 +6,7 @@ import {
   DEFAULT_GOOGLE_MEET_AUDIO_INPUT_COMMAND,
   DEFAULT_GOOGLE_MEET_AUDIO_OUTPUT_COMMAND,
 } from "./config.js";
+import { normalizeMeetUrl } from "./meet-url.js";
 import {
   GOOGLE_MEET_SYSTEM_PROFILER_COMMAND,
   outputMentionsBlackHole2ch,
@@ -278,10 +279,7 @@ function clearAudio(params: Record<string, unknown>) {
 }
 
 function startChrome(params: Record<string, unknown>) {
-  const url = readString(params.url);
-  if (!url) {
-    throw new Error("url required");
-  }
+  const url = normalizeMeetUrl(params.url);
   const timeoutMs = readNumber(params.joinTimeoutMs, 30_000);
   const mode = readString(params.mode);
 
diff --git a/extensions/google-meet/src/node-invoke-policy.ts b/extensions/google-meet/src/node-invoke-policy.ts
index 854afe118804..d9428daaa0cf 100644
--- a/extensions/google-meet/src/node-invoke-policy.ts
+++ b/extensions/google-meet/src/node-invoke-policy.ts
@@ -4,7 +4,7 @@ import type {
   OpenClawPluginNodeInvokePolicyResult,
 } from "openclaw/plugin-sdk/plugin-entry";
 import type { GoogleMeetConfig } from "./config.js";
-import { normalizeMeetUrl } from "./runtime.js";
+import { normalizeMeetUrl } from "./meet-url.js";
 
 export const GOOGLE_MEET_CHROME_NODE_COMMAND = "googlemeet.chrome";
 
diff --git a/extensions/google-meet/src/runtime.ts b/extensions/google-meet/src/runtime.ts
index 2617196ebd9e..e24e19e132d8 100644
--- a/extensions/google-meet/src/runtime.ts
+++ b/extensions/google-meet/src/runtime.ts
@@ -12,6 +12,7 @@ import type {
   GoogleMeetModeInput,
   GoogleMeetTransport,
 } from "./config.js";
+import { normalizeMeetUrl } from "./meet-url.js";
 import { addGoogleMeetSetupCheck, getGoogleMeetSetupStatus } from "./setup.js";
 import {
   isSameMeetUrlForReuse,
@@ -50,6 +51,8 @@ import {
   type VoiceCallGateway,
 } from "./voice-call-gateway.js";
 
+export { normalizeMeetUrl } from "./meet-url.js";
+
 type ChromeAudioBridgeResult = NonNullable<
   | Awaited<ReturnType<typeof launchChromeMeet>>["audioBridge"]
   | Awaited<ReturnType<typeof launchChromeMeetOnNode>>["audioBridge"]
@@ -78,26 +81,6 @@ function buildTwilioVoiceCallSessionKey(meetingSessionId: string): string {
   return `voice:google-meet:${meetingSessionId}`;
 }
 
-export function normalizeMeetUrl(input: unknown): string {
-  const raw = normalizeOptionalString(input);
-  if (!raw) {
-    throw new Error("url required");
-  }
-  let url: URL;
-  try {
-    url = new URL(raw);
-  } catch {
-    throw new Error("url must be a valid Google Meet URL");
-  }
-  if (url.protocol !== "https:" || url.hostname.toLowerCase() !== "meet.google.com") {
-    throw new Error("url must be an explicit https://meet.google.com/... URL");
-  }
-  if (!/^\/[a-z]{3}-[a-z]{4}-[a-z]{3}(?:$|[/?#])/i.test(url.pathname)) {
-    throw new Error("url must include a Google Meet meeting code");
-  }
-  return url.toString();
-}
-
 function resolveTransport(input: GoogleMeetTransport | undefined, config: GoogleMeetConfig) {
   return input ?? config.defaultTransport;
 }