Update app.py

app.py

@@ -50,11 +50,14 @@ GCS_BUCKET_NAME = "elderly-healthwatch-images"
 GCS_CREDENTIALS_FILE = "gcs-credentials.json"
 
 DEFAULT_VLM_PROMPT = (
-    "From the provided face/eye images, compute the required screening features "
-    "(pallor, sclera yellowness, redness, mobility metrics, quality checks) "
-    "and output a clean JSON feature vector only and the values should be confidence scores."
+    "Analyze the provided face and eye images and extract only the following screening features: "
+    "pallor, sclera_yellowness, eye_redness, facial_mobility_metrics, and image_quality_checks. "
+    "Return a single valid JSON object only (no text, no markdown). "
+    "Each feature value must be a normalized confidence score between 0 and 1. "
+    "If a feature cannot be reliably determined, assign null."
 )
 
+
 LLM_SYSTEM_PROMPT = (
     "System: This assistant MUST ONLY OUTPUT a single valid JSON object as its response — "
     "no prose, no explanations, no code fences, no annotations."