add: main.py

main.py

@@ -0,0 +1,95 @@
+import os
+import asyncio
+from langchain_openai import ChatOpenAI
+from langchain_core.messages import HumanMessage
+from langchain.tools import tool
+from deepagents import create_deep_agent
+from deepagents.backends import FilesystemBackend, LocalShellBackend, CompositeBackend
+from langgraph.checkpoint.memory import MemorySaver
+from rich.console import Console
+
+# ---------- LLM ----------
+llm = ChatOpenAI(
+    model="openai/gpt-oss-20b:free",
+    base_url="https://openrouter.ai/api/v1",
+    api_key=os.getenv("OPENAI_API_KEY"),
+    temperature=0.0,
+)
+
+# ---------- Backend ----------
+backend = CompositeBackend([
+    LocalShellBackend(workspace_dir="./workspace"),
+    FilesystemBackend(),
+])
+
+# ---------- Tool ----------
+@tool
+def get_price(query: str) -> str:
+    """Return a mock price for a city and date."""
+    return f"Price for {query} is $42"
+
+# ---------- Memory ----------
+memory = MemorySaver()
+
+# ---------- Console ----------
+console = Console()
+
+# ---------- Agent ----------
+agent = create_deep_agent(
+    model=llm,
+    tools=[get_price],
+    backend=backend,
+    system_prompt="You are a helpful agent that can fetch prices.",
+    checkpointer=memory,
+    interrupt_before=["tools"],
+)
+
+# ---------- Helper to display tool call ----------
+async def display_tool_call(state):
+    # Get the last tool call from the messages
+    messages = state.values.get("messages", [])
+    if not messages:
+        return
+    last_msg = messages[-1]
+    if hasattr(last_msg, "tool_calls") and last_msg.tool_calls:
+        tool_call = last_msg.tool_calls[0]
+        name = tool_call.get("name")
+        args = tool_call.get("args")
+        console.print(f"\n[bold cyan]Agent wants to call tool:[/bold cyan] {name}({args})")
+
+# ---------- Main loop ----------
+async def ask_and_run(user_input, config):
+    async for chunk in agent.stream(user_input, config=config, stream_mode=["messages", "updates"]):
+        chunk_type, chunk_data = chunk
+        state = agent.get_state(config)
+
+        if chunk_type == "messages":
+            # Stream token output
+            console.print(chunk_data, end="")
+
+        if chunk_type == "updates":
+            # Tool execution output
+            console.print(chunk_data, end="")
+
+        # Handle interrupt before tool call
+        if "__interrupt__" in chunk_data and state.next == ("tools",):
+            await display_tool_call(state)
+            answer = input("Разрешить? (Y/n): ")
+            if answer.lower().strip() in ("", "y", "yes"):
+                # Resume by calling ask_and_run with None to continue
+                await ask_and_run(None, config)
+            else:
+                console.print("[red]Отменено[/red]")
+                break
+
+async def main():
+    config = {"configurable": {"thread_id": "conversation-1"}}
+    console.print("[bold green]Добро пожаловать! Введите 'exit' для выхода.[/bold green]")
+    while True:
+        user_input = input("\nВы: ")
+        if user_input.lower() == "exit":
+            break
+        await ask_and_run({"messages": [{"role": "human", "content": user_input}]}, config)
+
+if __name__ == "__main__":
+    asyncio.run(main())