diff --git a/agent-office/app/agents/music.py b/agent-office/app/agents/music.py
index cd54366..9e05809 100644
--- a/agent-office/app/agents/music.py
+++ b/agent-office/app/agents/music.py
@@ -63,7 +63,9 @@ class MusicAgent(BaseAgent):
 
         approve_task(task_id, via="telegram")
         await self.transition("working", "작곡 중...", task_id)
+        asyncio.create_task(self._poll_composition(task_id, task))
 
+    async def _poll_composition(self, task_id: str, task: dict) -> None:
         try:
             input_data = task["input_data"]
             payload = {
diff --git a/agent-office/app/agents/stock.py b/agent-office/app/agents/stock.py
index 6f8c441..effabb0 100644
--- a/agent-office/app/agents/stock.py
+++ b/agent-office/app/agents/stock.py
@@ -45,12 +45,16 @@ class StockAgent(BaseAgent):
             return {"ok": True, "message": "뉴스 수집 시작"}
 
         if command == "add_alert":
+            symbol = params.get("symbol")
+            target_price = params.get("target_price")
+            if not symbol or target_price is None:
+                return {"ok": False, "message": "symbol과 target_price는 필수입니다"}
             config = get_agent_config(self.agent_id)
             alerts = config["custom_config"].get("alerts", [])
             alerts.append({
-                "symbol": params["symbol"],
-                "name": params.get("name", params["symbol"]),
-                "target_price": params["target_price"],
+                "symbol": symbol,
+                "name": params.get("name", symbol),
+                "target_price": target_price,
                 "direction": params.get("direction", "above"),
             })
             from ..db import update_agent_config
diff --git a/agent-office/app/main.py b/agent-office/app/main.py
index 99df65f..1928a71 100644
--- a/agent-office/app/main.py
+++ b/agent-office/app/main.py
@@ -1,6 +1,6 @@
 import os
 import json
-from fastapi import FastAPI, WebSocket, WebSocketDisconnect
+from fastapi import FastAPI, HTTPException, WebSocket, WebSocketDisconnect
 from fastapi.middleware.cors import CORSMiddleware
 
 from .config import CORS_ALLOW_ORIGINS
@@ -48,7 +48,10 @@ async def websocket_endpoint(ws: WebSocket):
         }, ensure_ascii=False))
         while True:
             data = await ws.receive_text()
-            msg = json.loads(data)
+            try:
+                msg = json.loads(data)
+            except json.JSONDecodeError:
+                continue
             await _handle_ws_message(msg)
     except WebSocketDisconnect:
         pass
@@ -86,7 +89,7 @@ def list_agents():
 def agent_detail(agent_id: str):
     config = get_agent_config(agent_id)
     if not config:
-        return {"error": "Agent not found"}, 404
+        raise HTTPException(status_code=404, detail="Agent not found")
     agent = get_agent(agent_id)
     state_info = {"state": agent.state, "detail": agent.state_detail} if agent else {}
     return {**config, **state_info}
@@ -114,7 +117,7 @@ def pending_tasks():
 def task_detail(task_id: str):
     task = get_task(task_id)
     if not task:
-        return {"error": "Task not found"}, 404
+        raise HTTPException(status_code=404, detail="Task not found")
     return task
 
 @app.post("/api/agent-office/command")
diff --git a/agent-office/requirements.txt b/agent-office/requirements.txt
index accb774..0aed057 100644
--- a/agent-office/requirements.txt
+++ b/agent-office/requirements.txt
@@ -1,7 +1,5 @@
 fastapi==0.115.6
 uvicorn[standard]==0.30.6
-requests==2.32.3
 apscheduler==3.10.4
-python-telegram-bot==21.5
 websockets>=12.0
 httpx>=0.27