Fix agent workspace file handlers

backend/api/agents.py

@@ -13,7 +13,8 @@ from typing import Any, Dict, List, Optional
 from fastapi import APIRouter, HTTPException, Depends, Body, UploadFile, File, Form
 from pydantic import BaseModel, Field
 
-from backend.agents import AgentFactory, WorkspaceManager, get_registry
+from backend.agents import AgentFactory, get_registry
+from backend.agents.workspace_manager import RunWorkspaceManager
 from backend.agents.agent_workspace import load_agent_workspace_config
 from backend.agents.skills_manager import SkillsManager
 from backend.agents.toolkit_factory import load_agent_profiles
@@ -100,8 +101,8 @@ def get_agent_factory():
 
 
 def get_workspace_manager():
-    """Get WorkspaceManager instance."""
-    return WorkspaceManager()
+    """Get run-scoped workspace manager instance."""
+    return RunWorkspaceManager()
 
 
 def get_skills_manager():
@@ -652,7 +653,7 @@ async def get_agent_file(
     workspace_id: str,
     agent_id: str,
     filename: str,
-    workspace_manager: WorkspaceManager = Depends(get_workspace_manager),
+    workspace_manager: RunWorkspaceManager = Depends(get_workspace_manager),
 ):
     """
     Read an agent's workspace file.
@@ -682,7 +683,7 @@ async def update_agent_file(
     agent_id: str,
     filename: str,
     content: str = Body(..., media_type="text/plain"),
-    workspace_manager: WorkspaceManager = Depends(get_workspace_manager),
+    workspace_manager: RunWorkspaceManager = Depends(get_workspace_manager),
 ):
     """
     Update an agent's workspace file.