fix: refresh delegation permissions and report Reasoner task outcomes

backend/services/brains/prompt_tasks.py

@@ -16,9 +16,29 @@ TASK_HINT = """
 """
 
 
+async def load_current_backend(assistant_id, configured_backend, variable_definitions):
+    """Recheck task permissions at delegation, even during a long voice call."""
+    from db.models import Assistant
+    from db.session import SessionLocal
+    from services.task_backend_resources import resolve_task_backend
+
+    async with SessionLocal() as session:
+        assistant = await session.get(Assistant, assistant_id)
+        if assistant is None:
+            raise ValueError("助手已删除，不能创建新任务")
+        if (assistant.dynamic_variable_definitions or {}) != variable_definitions:
+            raise ValueError("助手变量配置已更新，请重新连接后再委派任务")
+        current = await resolve_task_backend(session, assistant)
+    if (current is None or current.id != configured_backend.id
+            or current.instruction_source != configured_backend.instruction_source):
+        raise ValueError("助手任务绑定已更新，请重新连接后再委派任务")
+    return current
+
+
 class PromptTaskBridge:
-    def __init__(self, cfg, runtime, executor, service=task_service):
+    def __init__(self, cfg, runtime, executor, service=task_service, backend_loader=load_current_backend):
         self.cfg, self.runtime, self.executor, self.service = cfg, runtime, executor, service
+        self._backend_loader = backend_loader
         self._announced = set()
         self._detach = service.subscribe(runtime.session_id, self.on_task) if runtime.transport is not None else lambda: None
 
@@ -39,6 +59,8 @@ class PromptTaskBridge:
                 await params.result_callback({"status": "error", "message": "自动测试不启动真实后台任务，请使用语音调试验证"})
                 return
             try:
+                assistant_id = self.cfg.dynamic_variables.get("system__agent_id", "")
+                current_backend = await self._backend_loader(assistant_id, backend, self.cfg.dynamic_variable_definitions)
                 kind = source.get("source")
                 if kind == "model":
                     instruction = (params.arguments or {}).get("instruction")
@@ -53,9 +75,9 @@ class PromptTaskBridge:
                 if not isinstance(instruction, str):
                     raise ValueError("任务指令必须是字符串")
                 result = await self.service.submit(
-                    assistant_id=self.cfg.dynamic_variables.get("system__agent_id", ""),
+                    assistant_id=assistant_id,
                     conversation_id=self.cfg.conversation_id,
-                    backend=backend, instruction=instruction, invocation_id=params.tool_call_id,
+                    backend=current_backend, instruction=instruction, invocation_id=params.tool_call_id,
                     variable_state={"values": self.executor.store.values,
                                     "definitions": self.cfg.dynamic_variable_definitions,
                                     "secrets": self.executor.store.secrets},