Refine course progression and runtime safety

s01_agent_loop/code.py

@@ -32,7 +32,7 @@ import subprocess
 
 try:
     import readline
-    # macOS 的 libedit 在处理中文输入时有退格问题，这四行修复它
+    # #143 UTF-8 backspace fix for macOS libedit
     readline.parse_and_bind('set bind-tty-special-chars off')
     readline.parse_and_bind('set input-meta on')
     readline.parse_and_bind('set output-meta on')
@@ -53,7 +53,7 @@ MODEL = os.environ["MODEL_ID"]
 
 SYSTEM = f"You are a coding agent at {os.getcwd()}. Use bash to solve tasks. Act, don't explain."
 
-# ── Tool definition: just bash ────────────────────────────
+# -- Tool definition: just bash --
 TOOLS = [{
     "name": "bash",
     "description": "Run a shell command.",
@@ -65,7 +65,7 @@ TOOLS = [{
 }]
 
 
-# ── Tool execution ────────────────────────────────────────
+# -- Tool execution --
 def run_bash(command: str) -> str:
     dangerous = ["rm -rf /", "sudo", "shutdown", "reboot", "> /dev/"]
     if any(d in command for d in dangerous):
@@ -81,7 +81,7 @@ def run_bash(command: str) -> str:
         return f"Error: {e}"
 
 
-# ── The core pattern: a while loop that calls tools until the model stops ──
+# -- The core pattern: a while loop that calls tools until the model stops --
 def agent_loop(messages: list):
     while True:
         response = client.messages.create(
@@ -113,10 +113,10 @@ def agent_loop(messages: list):
         messages.append({"role": "user", "content": results})
 
 
-# ── Entry point ──────────────────────────────────────────
+# -- Entry point --
 if __name__ == "__main__":
     print("s01: Agent Loop")
-    print("输入问题，回车发送。输入 q 退出。\n")
+    print("Enter a question, press Enter to send. Type q to quit.\n")
 
     history = []
     while True: