From e05c25b6035f6bc439a3f9d307070ae5a5d9a152 Mon Sep 17 00:00:00 2001
From: Stuart Fenton <stuart.fenton@grandmore.com>
Date: Wed, 23 Jul 2025 23:28:35 +0100
Subject: [PATCH] fix: add missing MCP protocol handlers to prevent Claude
 Desktop crashes

- Add ListResourcesRequestSchema and ListPromptsRequestSchema imports
- Implement required resources and prompts capabilities in server setup
- Add empty handlers for list_resources and list_prompts requests
- Fixes Claude Desktop Electron crash on startup when MCP server lacks
  required protocol handlers

Resolves issue where Claude Desktop would crash with 'dialog module can
only be used after app is ready' error when connecting to MCP servers
that don't implement the full MCP protocol specification.
---
 app/native-server/src/mcp/mcp-server-stdio.ts | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/app/native-server/src/mcp/mcp-server-stdio.ts b/app/native-server/src/mcp/mcp-server-stdio.ts
index aa00c23..9a1d0fd 100644
--- a/app/native-server/src/mcp/mcp-server-stdio.ts
+++ b/app/native-server/src/mcp/mcp-server-stdio.ts
@@ -6,6 +6,8 @@ import {
   CallToolRequestSchema,
   CallToolResult,
   ListToolsRequestSchema,
+  ListResourcesRequestSchema,
+  ListPromptsRequestSchema,
 } from '@modelcontextprotocol/sdk/types.js';
 import { TOOL_SCHEMAS } from 'chrome-mcp-shared';
 import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js';
@@ -40,6 +42,8 @@ export const getStdioMcpServer = () => {
     {
       capabilities: {
         tools: {},
+        resources: {},
+        prompts: {},
       },
     },
   );
@@ -77,6 +81,12 @@ export const setupTools = (server: Server) => {
   server.setRequestHandler(CallToolRequestSchema, async (request) =>
     handleToolCall(request.params.name, request.params.arguments || {}),
   );
+
+  // List resources handler - REQUIRED BY MCP PROTOCOL
+  server.setRequestHandler(ListResourcesRequestSchema, async () => ({ resources: [] }));
+
+  // List prompts handler - REQUIRED BY MCP PROTOCOL
+  server.setRequestHandler(ListPromptsRequestSchema, async () => ({ prompts: [] }));
 };
 
 const handleToolCall = async (name: string, args: any): Promise<CallToolResult> => {