diff --git a/agent/subagent_lifecycle.py b/agent/subagent_lifecycle.py
index 63603675bc..b85d84d9e1 100644
--- a/agent/subagent_lifecycle.py
+++ b/agent/subagent_lifecycle.py
@@ -156,7 +156,12 @@ class _Registry:
 
 
 _REGISTRY = _Registry()
-_EXECUTOR = ThreadPoolExecutor(max_workers=8, thread_name_prefix="hermes-lifecycle")
+# Daemon worker pool: a wedged/abandoned child must never block interpreter
+# exit at atexit-join time (same rationale as _run_single_child's timeout
+# executor and the async-delegation registry pool).
+from tools.daemon_pool import DaemonThreadPoolExecutor as _DaemonExecutor
+
+_EXECUTOR = _DaemonExecutor(max_workers=8, thread_name_prefix="hermes-lifecycle")
 _SECRET = secrets.token_bytes(32)
 _ACTIVE_PARENT_AGENT: contextvars.ContextVar[Any] = contextvars.ContextVar(
     "hermes_subagent_lifecycle_parent", default=None
diff --git a/tests/agent/test_subagent_lifecycle.py b/tests/agent/test_subagent_lifecycle.py
index faa3ddabbf..38fd62d93a 100644
--- a/tests/agent/test_subagent_lifecycle.py
+++ b/tests/agent/test_subagent_lifecycle.py
@@ -202,6 +202,10 @@ def test_public_lifecycle_runs_host_aggregation(monkeypatch):
         child_role="leaf",
         child_summary="aggregated",
         child_status="completed",
+        # Redacted tool history rides the shared finalization pipeline
+        # (#62011/#72403); empty here because the fabricated result carries
+        # no tool_trace.
+        tool_call_history=[],
         duration_ms=250,
     )
     assert parent.session_estimated_cost_usd == 3.5