diff --git a/tools/delegate_tool.py b/tools/delegate_tool.py
index 31e13249..c8de9722 100644
--- a/tools/delegate_tool.py
+++ b/tools/delegate_tool.py
@@ -205,6 +205,9 @@ def _run_single_child(
             provider=getattr(parent_agent, "provider", None),
             api_mode=getattr(parent_agent, "api_mode", None),
             max_iterations=max_iterations,
+            max_tokens=getattr(parent_agent, "max_tokens", None),
+            reasoning_config=getattr(parent_agent, "reasoning_config", None),
+            prefill_messages=getattr(parent_agent, "prefill_messages", None),
             enabled_toolsets=child_toolsets,
             quiet_mode=True,
             ephemeral_system_prompt=child_prompt,