feat: add MCP tool integration

backend/services/brains/prompt_brain.py

@@ -55,8 +55,8 @@ class PromptBrain(BaseBrain):
         for tool in cfg.tools:
             if tool.type == "end_call":
                 schema, handler = self._make_end_call_tool(tool, runtime)
-            elif tool.type == "http":
-                schema, handler = self._make_http_tool(tool, runtime)
+            elif tool.type in {"http", "mcp"}:
+                schema, handler = self._make_remote_tool(tool, runtime)
             else:
                 continue
             schemas.append(schema)
@@ -96,7 +96,7 @@ class PromptBrain(BaseBrain):
         if self._dynamic_enabled and self._runtime is not None:
             self._runtime.set_system_prompt(self._store.render(self._cfg.prompt))
 
-    def _make_http_tool(self, tool, runtime: BrainRuntime):
+    def _make_remote_tool(self, tool, runtime: BrainRuntime):
         properties, required = self._tools.schema_parts(tool)
         self._tools.register_secrets(tool)
 
@@ -108,7 +108,7 @@ class PromptBrain(BaseBrain):
                 await params.result_callback(result)
             except (ToolExecutionError, ValueError) as exc:
                 await params.result_callback(
-                    {"status": "error", "message": f"HTTP 工具调用失败: {exc}"}
+                    {"status": "error", "message": f"工具调用失败: {exc}"}
                 )
 
         schema = FunctionSchema(