diff --git a/tools/delegate_tool.py b/tools/delegate_tool.py
index 5655631662..c288e7b28a 100644
--- a/tools/delegate_tool.py
+++ b/tools/delegate_tool.py
@@ -483,8 +483,8 @@ _HEARTBEAT_INTERVAL = 30  # seconds between parent activity heartbeats during de
 # The idle ceiling stays tight so genuinely stuck children don't mask the gateway
 # timeout. The in-tool ceiling is much higher so legit long-running tools get
 # time to finish; child_timeout_seconds (default 600s) is still the hard cap.
-_HEARTBEAT_STALE_CYCLES_IDLE = 5  # 5 * 30s = 150s idle between turns → stale
-_HEARTBEAT_STALE_CYCLES_IN_TOOL = 20  # 20 * 30s = 600s stuck on same tool → stale
+_HEARTBEAT_STALE_CYCLES_IDLE = 15  # 15 * 30s = 450s idle between turns → stale
+_HEARTBEAT_STALE_CYCLES_IN_TOOL = 40  # 40 * 30s = 1200s stuck on same tool → stale
 DEFAULT_TOOLSETS = ["terminal", "file", "web"]