diff --git a/agents/s09_agent_teams.py b/agents/s09_agent_teams.py
index 90f6760df..bd666552a 100644
--- a/agents/s09_agent_teams.py
+++ b/agents/s09_agent_teams.py
@@ -260,7 +260,7 @@ def _safe_path(p: str) -> Path:
 
 
 def _run_bash(command: str) -> str:
-    dangerous = ["rm -rf /", "sudo", "shutdown", "reboot"]
+    dangerous = ["rm -rf /", "sudo", "shutdown", "reboot", "> /dev/"]
     if any(d in command for d in dangerous):
         return "Error: Dangerous command blocked"
     try:
diff --git a/agents/s10_team_protocols.py b/agents/s10_team_protocols.py
index d5475359c..3f9923da2 100644
--- a/agents/s10_team_protocols.py
+++ b/agents/s10_team_protocols.py
@@ -301,7 +301,7 @@ def _safe_path(p: str) -> Path:
 
 
 def _run_bash(command: str) -> str:
-    dangerous = ["rm -rf /", "sudo", "shutdown", "reboot"]
+    dangerous = ["rm -rf /", "sudo", "shutdown", "reboot", "> /dev/"]
     if any(d in command for d in dangerous):
         return "Error: Dangerous command blocked"
     try:
diff --git a/agents/s11_autonomous_agents.py b/agents/s11_autonomous_agents.py
index 3aec416b8..c3a62cdaa 100644
--- a/agents/s11_autonomous_agents.py
+++ b/agents/s11_autonomous_agents.py
@@ -389,7 +389,7 @@ def _safe_path(p: str) -> Path:
 
 
 def _run_bash(command: str) -> str:
-    dangerous = ["rm -rf /", "sudo", "shutdown", "reboot"]
+    dangerous = ["rm -rf /", "sudo", "shutdown", "reboot", "> /dev/"]
     if any(d in command for d in dangerous):
         return "Error: Dangerous command blocked"
     try: