diff --git a/apps/api/src/api/tool_instances.py b/apps/api/src/api/tool_instances.py
index 5ba9a36..5ba0134 100644
--- a/apps/api/src/api/tool_instances.py
+++ b/apps/api/src/api/tool_instances.py
@@ -110,6 +110,13 @@ async def _resolve_single_git_mount(
         logger.warning("Invalid git mount skipped: missing remote_url or target_path")
         return []
     
+    # Expand ~ to the working directory or a default home path
+    # (The container may have HOME set to /tmp, so we resolve it ourselves)
+    if target_path.startswith("~"):
+        home = working_directory or "/home/user"
+        target_path = home + target_path[1:]
+        logger.info("Expanded ~ to %s", target_path)
+    
     # Resolve relative target paths against working directory
     if target_path and not target_path.startswith("/"):
         base = working_directory or "/home/user"