diff --git a/skills/productivity/google-workspace/scripts/gws_bridge.py b/skills/productivity/google-workspace/scripts/gws_bridge.py
index adecd33ad..7b5d351f8 100755
--- a/skills/productivity/google-workspace/scripts/gws_bridge.py
+++ b/skills/productivity/google-workspace/scripts/gws_bridge.py
@@ -25,6 +25,13 @@ def refresh_token(token_data: dict) -> dict:
     import urllib.parse
     import urllib.request
 
+    required_keys = ["client_id", "client_secret", "refresh_token", "token_uri"]
+    missing = [k for k in required_keys if k not in token_data]
+    if missing:
+        print(f"ERROR: google_token.json is missing required fields: {', '.join(missing)}", file=sys.stderr)
+        print("Please re-authenticate by running the Google Workspace setup script.", file=sys.stderr)
+        sys.exit(1)
+
     params = urllib.parse.urlencode({
         "client_id": token_data["client_id"],
         "client_secret": token_data["client_secret"],