diff --git a/scripts/operator-browser/xdg-open b/scripts/operator-browser/xdg-open
index 2f731c1..eb5277f 100755
--- a/scripts/operator-browser/xdg-open
+++ b/scripts/operator-browser/xdg-open
@@ -56,11 +56,24 @@ def launch_argv(browser, profile_dir, url):
     ]
 
 
+def stamp(result):
+    path = Path("/home/worsch/.local/state/railiance/receipts/operator-browser-last.txt")
+    try:
+        path.parent.mkdir(mode=0o700, parents=True, exist_ok=True)
+        path.write_text(result + "\n", encoding="utf-8")
+        os.chmod(path, 0o600)
+    except OSError:
+        return
+
+
 def main():
+    stamp("called")
     if len(sys.argv) != 2 or not allowed(sys.argv[1]):
+        stamp("rejected")
         return 1
     browser = browser_path()
     if not browser:
+        stamp("no-browser")
         return 1
     profile = Path(tempfile.mkdtemp(prefix="operator-browser-"))
     os.chmod(profile, 0o700)
@@ -95,8 +108,13 @@ def main():
             stderr=subprocess.DEVNULL,
             timeout=20,
         )
-        return int(opened.returncode != 0)
+        if opened.returncode != 0:
+            stamp("open-failed")
+            return 1
+        stamp("opened")
+        return 0
     except (OSError, subprocess.SubprocessError):
+        stamp("open-failed")
         return 1