examples: A simple agent that can execute bash

examples/README.md

@@ -127,3 +127,7 @@ Requirement: `pip install tqdm`
 ### Thinking (levels) - Choose the thinking level
 
 - [thinking-levels.py](thinking-levels.py)
+
+### Simple Agent - A simple agent that can execute bash
+
+- [simple-agent.py](simple-agent.py)

examples/simple-agent.py

@@ -0,0 +1,100 @@
+import os
+import subprocess
+import ollama
+
+model = "qwen3:4b"
+
+system = "You are a smart agent. Use bash to solve some tasks."
+
+tools = [{
+    "type": "function",
+    "function": {
+        "name": "bash",
+        "description": "Run a shell command.",
+        "parameters": {
+            "type": "object",
+            "properties": {"command": {"type": "string"}},
+            "required": ["command"],
+        },
+    },
+}]
+
+
+def run_bash(command: str) -> str:
+    dangerous = ["rm -rf", "sudo", "shutdown", "reboot", "> /dev/"]
+    if any(d in command for d in dangerous):
+        return "Error: Dangerous command blocked"
+    try:
+        r = subprocess.run(command, shell=True, cwd=os.getcwd(),
+                           capture_output=True, text=True, timeout=120)
+        out = (r.stdout + r.stderr).strip()
+        return out[:50000] if out else "(no output)"
+    except subprocess.TimeoutExpired:
+        return "Error: Timeout (120s)"
+
+
+def agent_loop(messages: list):
+    if not messages or messages[0].get("role") != "system":
+        messages.insert(0, {"role": "system", "content": system})
+
+    while True:
+        response = ollama.chat(
+            model=model,
+            messages=messages,
+            tools=tools,
+            options={"num_predict": 8000},
+        )
+
+        msg = response["message"]
+        assistant_content = msg.get("content", "")
+        assistant_msg = {"role": "assistant", "content": assistant_content}
+        tool_calls = msg.get("tool_calls", [])
+        if tool_calls:
+            assistant_msg["tool_calls"] = tool_calls
+        messages.append(assistant_msg)
+
+        if not tool_calls:
+            return
+
+        for tool in tool_calls:
+            func_name = tool["function"]["name"]
+            if func_name == "bash":
+                import json
+                args = tool["function"]["arguments"]
+                if isinstance(args, str):
+                    args = json.loads(args)
+                command = args["command"]
+                output = run_bash(command)
+                messages.append({
+                    "role": "tool",
+                    "content": output,
+                    "tool_name": "bash",
+                })
+
+
+if __name__ == "__main__":
+    try:
+        ollama.show(model)
+    except Exception:
+        print(f"\033[31mModel '{model}' not found locally.\033[0m")
+        print(f"Pull it first with: \033[33mollama pull {model}\033[0m")
+        exit(1)
+
+    history = []
+    print(f"\033[32mOllama agent loop running with {model}\033[0m")
+    print("Type 'q' or 'exit' to quit.\n")
+
+    while True:
+        try:
+            query = input("\033[36mOllama-Agent >> \033[0m")
+        except (EOFError, KeyboardInterrupt):
+            break
+        if query.strip().lower() in ("q", "exit", ""):
+            break
+        history.append({"role": "user", "content": query})
+        agent_loop(history)
+        for entry in reversed(history):
+            if entry.get("role") == "assistant" and entry.get("content"):
+                print(entry["content"])
+                break
+        print()