feat(assistant): optimize MCP and custom widget authoring (#6743)

* feat(assistant): optimize MCP and custom widget authoring

* fix(assistant): isolate server-safe JSX analyzer

* refactor(assistant): generate MCP tool staging

* fix(assistant): preserve widget placement follow-up

* fix(ci): allow fast gate to finish

* fix(custom-widgets): address review findings

* fix(custom-widgets): split preview evidence module

* style: format assistant custom widget files

* fix(custom-widgets): sync formatted skill schema

apps/nextjs/src/app/api/mcp/_protocol.ts

@@ -2,6 +2,8 @@ import { createMcpHandler, McpServer } from "@modelcontextprotocol/server";
 
 import type { McpTool } from "@homarr/api/mcp";
 
+import { toAssistantToolOutput } from "../assistant/chat/assistant-tool-output";
+
 interface CreateMcpProtocolHandlerOptions {
   caller: unknown;
   tools: McpTool[];
@@ -65,7 +67,12 @@ export const createMcpProtocolHandler = ({
               const input = Object.keys(args).length > 0 ? args : undefined;
               const result = await (procedure as (value: unknown) => Promise<unknown>)(input);
               return {
-                content: [{ type: "text" as const, text: JSON.stringify(result) }],
+                content: [
+                  {
+                    type: "text" as const,
+                    text: JSON.stringify(toAssistantToolOutput(result)),
+                  },
+                ],
               };
             } catch (error) {
               onToolError?.(tool.name, error);