1 files changed, 14 insertions, 2 deletions
diff --git a/Omni/Task/Core.hs b/Omni/Task/Core.hs
index 58744fa..3de42b2 100644
--- a/Omni/Task/Core.hs
+++ b/Omni/Task/Core.hs
@@ -192,7 +192,7 @@ withTaskReadLock action =
               action
           )
 
--- Generate a short ID using base62 encoding of timestamp
+-- Generate a short ID using base36 encoding of timestamp (lowercase)
 generateId :: IO Text
 generateId = do
   now <- getCurrentTime
@@ -339,7 +339,7 @@ createTask title taskType parent namespace priority deps description =
         deps' = map normalizeDependency deps
 
     tid <- case parent' of
-      Nothing -> generateId
+      Nothing -> generateUniqueId
       Just pid -> do
         tasks <- loadTasksInternal
         pure <| computeNextChildId tasks pid
@@ -361,6 +361,18 @@ createTask title taskType parent namespace priority deps description =
     saveTaskInternal task
     pure task
 
+-- Generate a unique ID (checking against existing tasks)
+generateUniqueId :: IO Text
+generateUniqueId = do
+  tasks <- loadTasksInternal
+  go tasks
+  where
+    go tasks = do
+      tid <- generateId
+      case findTask tid tasks of
+        Nothing -> pure tid
+        Just _ -> go tasks -- Retry if collision (case-insensitive)
+
 -- Update task status
 updateTaskStatus :: Text -> Status -> [Dependency] -> IO ()
 updateTaskStatus tid newStatus newDeps =