diff --git a/tests/test_vibe_update.py b/tests/test_vibe_update.py
index 86b486f..4300510 100644
--- a/tests/test_vibe_update.py
+++ b/tests/test_vibe_update.py
@@ -228,6 +228,10 @@ def test_derive_health_url_drops_status_query_parameters(self):
             "http://localhost:8080/api/health",
         )
 
+    def test_derive_health_url_reports_invalid_url_without_traceback(self):
+        with self.assertRaisesRegex(RuntimeError, "无效的 InkDash URL"):
+            vibe_update.derive_health_url("http://[::1")
+
     def test_format_health_summary(self):
         summary = vibe_update.format_health_summary({
             "status": "ok",
@@ -295,6 +299,19 @@ def test_wait_for_health_times_out_with_last_error(self):
                     monotonic_fn=iter([0.0, 0.0]).__next__,
                 )
 
+    def test_wait_for_health_rejects_invalid_url_before_retry(self):
+        with patch("vibe_update.request_vibe") as request_mock:
+            with self.assertRaisesRegex(RuntimeError, "无效的 InkDash URL"):
+                vibe_update.wait_for_health(
+                    "http://[::1",
+                    request_timeout=0.1,
+                    wait_timeout=2.0,
+                    wait_interval=0.1,
+                    sleep_fn=lambda _: self.fail("invalid URL should not sleep"),
+                )
+
+        request_mock.assert_not_called()
+
     def test_request_vibe_reports_invalid_json_without_traceback(self):
         with patch("vibe_update.request.urlopen", return_value=FakeResponse(b"<html>not json</html>")):
             with self.assertRaisesRegex(RuntimeError, "不是有效 JSON"):
diff --git a/vibe_update.py b/vibe_update.py
index c5ee33b..02bd898 100644
--- a/vibe_update.py
+++ b/vibe_update.py
@@ -311,7 +311,10 @@ def request_vibe(
 
 
 def derive_health_url(url: str) -> str:
-    parsed = urlparse(url.rstrip("/"))
+    try:
+        parsed = urlparse(url.rstrip("/"))
+    except ValueError as e:
+        raise RuntimeError(f"无效的 InkDash URL：{e}") from e
     path = parsed.path.rstrip("/")
     for suffix in ("/api/vibe", "/api/status", "/api/health"):
         if path.endswith(suffix):
@@ -405,13 +408,14 @@ def wait_for_health(
     sleep_fn=time.sleep,
     monotonic_fn=time.monotonic,
 ) -> Dict[str, Any]:
+    health_url = derive_health_url(url)
     deadline = monotonic_fn() + max(0.0, wait_timeout)
     interval = max(0.1, wait_interval)
     last_error = ""
 
     while True:
         try:
-            return request_vibe(derive_health_url(url), None, request_timeout, token)
+            return request_vibe(health_url, None, request_timeout, token)
         except RuntimeError as e:
             last_error = str(e)