diff --git a/engine/discord.py b/engine/discord.py
index 99f1918..fd39822 100644
--- a/engine/discord.py
+++ b/engine/discord.py
@@ -15,7 +15,16 @@
 ENV = ROOT / ".env"
 # The operator-managed bot credential is shared by TRON worktrees.  Keep the
 # engine-local file first for standalone installs and tests.
-MODES_ENV = ROOT.parents[2] / "tron-modes" / ".env"
+def _modes_env() -> Path:
+    """Find the shared modes env from either a checkout or an added worktree."""
+    for parent in ROOT.parents:
+        candidate = parent / "tron-modes" / ".env"
+        if candidate.exists():
+            return candidate
+    return ROOT.parents[2] / "tron-modes" / ".env"
+
+
+MODES_ENV = _modes_env()
 CHANNEL_ID = "1547918251651112971"
 MESSAGE_URL = f"https://discord.com/api/v10/channels/{CHANNEL_ID}/messages"
 _state = {"loaded": False, "token": None, "after": None}
@@ -38,10 +47,14 @@ def _load():
 
 
 def _request(url, data=None, timeout=10):
+    headers = {
+        "Authorization": f"Bot {_state['token']}",
+        "User-Agent": "42labs-tron/1.0",
+    }
+    if data is not None:
+        headers["Content-Type"] = "application/json"
     request = urllib.request.Request(
-        url, data=data,
-        headers={"Authorization": f"Bot {_state['token']}",
-                 "Content-Type": "application/json"})
+        url, data=data, headers=headers)
     with urllib.request.urlopen(request, timeout=timeout) as response:
         return json.loads(response.read().decode())