From 861869cb48a2779ade57bfa452b3fc04a63deb20 Mon Sep 17 00:00:00 2001
From: Nikita <152299288+nikitagorlov54@users.noreply.github.com>
Date: Sun, 15 Mar 2026 05:23:05 +0100
Subject: [PATCH] fix(#878): add robust crontab binary check to requirements

---
 tools/cronjob_tools.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/cronjob_tools.py b/tools/cronjob_tools.py
index 124223c77..b082e5647 100644
--- a/tools/cronjob_tools.py
+++ b/tools/cronjob_tools.py
@@ -369,9 +369,13 @@ def check_cronjob_requirements() -> bool:
     """
     Check if cronjob tools can be used.
 
+    Requires 'crontab' executable to be present in the system PATH.
     Available in interactive CLI mode and gateway/messaging platforms.
-    Cronjobs are server-side scheduled tasks so they work from any interface.
     """
+    # Fix for issue #878: ensure crontab binary is actually available
+    if not shutil.which("crontab"):
+        return False
+
     return bool(
         os.getenv("HERMES_INTERACTIVE")
         or os.getenv("HERMES_GATEWAY_SESSION")