diff --git a/tests/test_proxy_health.py b/tests/test_proxy_health.py
new file mode 100644
index 000000000..f771fdf5e
--- /dev/null
+++ b/tests/test_proxy_health.py
@@ -0,0 +1,34 @@
+from fastapi.testclient import TestClient
+
+from headroom.proxy.models import ProxyConfig
+from headroom.proxy.server import create_app
+
+
+def test_readyz_excludes_kompress_from_aggregate_readiness(monkeypatch):
+    monkeypatch.setenv("HEADROOM_SKIP_UPSTREAM_CHECK", "1")
+
+    app = create_app(
+        ProxyConfig(
+            optimize=False,
+            cache_enabled=False,
+            rate_limit_enabled=False,
+        )
+    )
+    app.state.ready = True
+    proxy = app.state.proxy
+    proxy.http_client = object()
+    proxy.warmup.kompress.mark_error("model not cached")
+
+    client = TestClient(app)
+    response = client.get("/readyz")
+
+    assert response.status_code == 200
+    payload = response.json()
+    assert payload["ready"] is True
+    assert payload["status"] == "healthy"
+    assert payload["checks"]["kompress"] == {
+        "enabled": True,
+        "ready": False,
+        "status": "unhealthy",
+        "backend": None,
+    }