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app.py

@@ -42,6 +42,26 @@ ON_SPACES = bool(os.getenv("SPACE_ID"))
 if ON_SPACES:
     os.environ["PUBLIC_DEPLOYMENT"] = "1"
 
+    # ZeroGPU refuses to start a Space that declares no GPU function, failing
+    # with "No @spaces.GPU function detected during startup". This app is
+    # CPU-only by nature - it needs compilers, not a GPU - and the honest fix
+    # would be CPU Basic hardware, but downgrading an existing ZeroGPU Space
+    # requires a PRO subscription.
+    #
+    # Declaring a function that is never wired to any event satisfies the check
+    # at no cost: ZeroGPU allocates hardware on invocation, so one that is never
+    # called consumes no GPU time. Guarded by ImportError because the `spaces`
+    # package only exists on the platform, not in local development.
+    try:
+        import spaces
+
+        @spaces.GPU(duration=1)
+        def _zerogpu_startup_marker():  # never called; presence is the point
+            return None
+
+    except ImportError:
+        pass
+
 import providers  # noqa: E402  - imported after load_dotenv so it sees the keys
 import sandbox  # noqa: E402
 from examples import DEFAULT_EXAMPLE, EXAMPLES  # noqa: E402