diff --git a/agents/s01_agent_loop.py b/agents/s01_agent_loop.py
index 8455ebf..2734a70 100644
--- a/agents/s01_agent_loop.py
+++ b/agents/s01_agent_loop.py
@@ -108,8 +108,10 @@ if __name__ == "__main__":
             query = input("\033[36ms01 >> \033[0m")
         except (EOFError, KeyboardInterrupt):
             break
-        if query.strip().lower() in ("q", "exit", ""):
+        if query.strip().lower() in ("q", "exit"):
             break
+        if not query.strip():
+            continue
         history.append({"role": "user", "content": query})
         agent_loop(history)
         response_content = history[-1]["content"]
diff --git a/agents/s02_tool_use.py b/agents/s02_tool_use.py
index 8e434c0..261f681 100644
--- a/agents/s02_tool_use.py
+++ b/agents/s02_tool_use.py
@@ -138,8 +138,10 @@ if __name__ == "__main__":
             query = input("\033[36ms02 >> \033[0m")
         except (EOFError, KeyboardInterrupt):
             break
-        if query.strip().lower() in ("q", "exit", ""):
+        if query.strip().lower() in ("q", "exit"):
             break
+        if not query.strip():
+            continue
         history.append({"role": "user", "content": query})
         agent_loop(history)
         response_content = history[-1]["content"]
diff --git a/agents/s03_todo_write.py b/agents/s03_todo_write.py
index 4c7076c..dd37f6b 100644
--- a/agents/s03_todo_write.py
+++ b/agents/s03_todo_write.py
@@ -199,8 +199,10 @@ if __name__ == "__main__":
             query = input("\033[36ms03 >> \033[0m")
         except (EOFError, KeyboardInterrupt):
             break
-        if query.strip().lower() in ("q", "exit", ""):
+        if query.strip().lower() in ("q", "exit"):
             break
+        if not query.strip():
+            continue
         history.append({"role": "user", "content": query})
         agent_loop(history)
         response_content = history[-1]["content"]
diff --git a/agents/s04_subagent.py b/agents/s04_subagent.py
index dda2737..86bf2f0 100644
--- a/agents/s04_subagent.py
+++ b/agents/s04_subagent.py
@@ -175,8 +175,10 @@ if __name__ == "__main__":
             query = input("\033[36ms04 >> \033[0m")
         except (EOFError, KeyboardInterrupt):
             break
-        if query.strip().lower() in ("q", "exit", ""):
+        if query.strip().lower() in ("q", "exit"):
             break
+        if not query.strip():
+            continue
         history.append({"role": "user", "content": query})
         agent_loop(history)
         response_content = history[-1]["content"]
diff --git a/agents/s05_skill_loading.py b/agents/s05_skill_loading.py
index e14167a..46ba750 100644
--- a/agents/s05_skill_loading.py
+++ b/agents/s05_skill_loading.py
@@ -215,8 +215,10 @@ if __name__ == "__main__":
             query = input("\033[36ms05 >> \033[0m")
         except (EOFError, KeyboardInterrupt):
             break
-        if query.strip().lower() in ("q", "exit", ""):
+        if query.strip().lower() in ("q", "exit"):
             break
+        if not query.strip():
+            continue
         history.append({"role": "user", "content": query})
         agent_loop(history)
         response_content = history[-1]["content"]
diff --git a/agents/s06_context_compact.py b/agents/s06_context_compact.py
index 0fde70e..ed781da 100644
--- a/agents/s06_context_compact.py
+++ b/agents/s06_context_compact.py
@@ -244,8 +244,10 @@ if __name__ == "__main__":
             query = input("\033[36ms06 >> \033[0m")
         except (EOFError, KeyboardInterrupt):
             break
-        if query.strip().lower() in ("q", "exit", ""):
+        if query.strip().lower() in ("q", "exit"):
             break
+        if not query.strip():
+            continue
         history.append({"role": "user", "content": query})
         agent_loop(history)
         response_content = history[-1]["content"]
diff --git a/agents/s07_task_system.py b/agents/s07_task_system.py
index cf72783..7644c7a 100644
--- a/agents/s07_task_system.py
+++ b/agents/s07_task_system.py
@@ -231,8 +231,10 @@ if __name__ == "__main__":
             query = input("\033[36ms07 >> \033[0m")
         except (EOFError, KeyboardInterrupt):
             break
-        if query.strip().lower() in ("q", "exit", ""):
+        if query.strip().lower() in ("q", "exit"):
             break
+        if not query.strip():
+            continue
         history.append({"role": "user", "content": query})
         agent_loop(history)
         response_content = history[-1]["content"]
diff --git a/agents/s08_background_tasks.py b/agents/s08_background_tasks.py
index 390a777..773721a 100644
--- a/agents/s08_background_tasks.py
+++ b/agents/s08_background_tasks.py
@@ -222,8 +222,10 @@ if __name__ == "__main__":
             query = input("\033[36ms08 >> \033[0m")
         except (EOFError, KeyboardInterrupt):
             break
-        if query.strip().lower() in ("q", "exit", ""):
+        if query.strip().lower() in ("q", "exit"):
             break
+        if not query.strip():
+            continue
         history.append({"role": "user", "content": query})
         agent_loop(history)
         response_content = history[-1]["content"]
diff --git a/agents/s09_agent_teams.py b/agents/s09_agent_teams.py
index 90f6760..68a3905 100644
--- a/agents/s09_agent_teams.py
+++ b/agents/s09_agent_teams.py
@@ -385,8 +385,10 @@ if __name__ == "__main__":
             query = input("\033[36ms09 >> \033[0m")
         except (EOFError, KeyboardInterrupt):
             break
-        if query.strip().lower() in ("q", "exit", ""):
+        if query.strip().lower() in ("q", "exit"):
             break
+        if not query.strip():
+            continue
         if query.strip() == "/team":
             print(TEAM.list_all())
             continue
diff --git a/agents/s10_team_protocols.py b/agents/s10_team_protocols.py
index d547535..52a42ae 100644
--- a/agents/s10_team_protocols.py
+++ b/agents/s10_team_protocols.py
@@ -466,8 +466,10 @@ if __name__ == "__main__":
             query = input("\033[36ms10 >> \033[0m")
         except (EOFError, KeyboardInterrupt):
             break
-        if query.strip().lower() in ("q", "exit", ""):
+        if query.strip().lower() in ("q", "exit"):
             break
+        if not query.strip():
+            continue
         if query.strip() == "/team":
             print(TEAM.list_all())
             continue
diff --git a/agents/s11_autonomous_agents.py b/agents/s11_autonomous_agents.py
index 3aec416..51944b4 100644
--- a/agents/s11_autonomous_agents.py
+++ b/agents/s11_autonomous_agents.py
@@ -560,8 +560,10 @@ if __name__ == "__main__":
             query = input("\033[36ms11 >> \033[0m")
         except (EOFError, KeyboardInterrupt):
             break
-        if query.strip().lower() in ("q", "exit", ""):
+        if query.strip().lower() in ("q", "exit"):
             break
+        if not query.strip():
+            continue
         if query.strip() == "/team":
             print(TEAM.list_all())
             continue
diff --git a/agents/s12_worktree_task_isolation.py b/agents/s12_worktree_task_isolation.py
index 09f9052..dfaf725 100644
--- a/agents/s12_worktree_task_isolation.py
+++ b/agents/s12_worktree_task_isolation.py
@@ -770,8 +770,10 @@ if __name__ == "__main__":
             query = input("\033[36ms12 >> \033[0m")
         except (EOFError, KeyboardInterrupt):
             break
-        if query.strip().lower() in ("q", "exit", ""):
+        if query.strip().lower() in ("q", "exit"):
             break
+        if not query.strip():
+            continue
         history.append({"role": "user", "content": query})
         agent_loop(history)
         response_content = history[-1]["content"]
diff --git a/agents/s_full.py b/agents/s_full.py
index e2f887b..4928bef 100644
--- a/agents/s_full.py
+++ b/agents/s_full.py
@@ -714,8 +714,10 @@ if __name__ == "__main__":
             query = input("\033[36ms_full >> \033[0m")
         except (EOFError, KeyboardInterrupt):
             break
-        if query.strip().lower() in ("q", "exit", ""):
+        if query.strip().lower() in ("q", "exit"):
             break
+        if not query.strip():
+            continue
         if query.strip() == "/compact":
             if history:
                 print("[manual compact via /compact]")