try mcp.json:
{
"mcpServers": {
"browser-tools": {
"command": "cmd",
"args": [
"/c",
"npx -y @agentdeskai/[email protected]"
],
"enabled": true
}
}
}
and refresh
in your desktop try run command in cmd:
npx @agentdeskai/[email protected]
II had the same error. I usually use nvm to manage Node.js versions, but this time I installed the latest LTS version of Node.js (22) directly using the installer, and now it works.
If anyone is still having this issue on windows you can use paste the following code into your mcp.json file within cursor (remember to replace the Github token placeholder with your actual token):
{
"mcpServers": {
"github": {
"command": "cmd",
"args": [
"/c",
"npx",
"-y",
"@smithery/cli@latest",
"run",
"@smithery-ai/github",
"--config",
"{\"githubPersonalAccessToken\":\"<Github personal access token goes here>\"}"
]
}
}
}
Or on MAC:
{
"mcpServers": {
"github": {
"command": "npx",
"args": [
"-y",
"@smithery/cli@latest",
"run",
"@smithery-ai/github",
"--config",
"{\"githubPersonalAccessToken\":\"<Github personal access token goes here>\"}"
]
}
}
}
Hope this helps. Cheers!
Anyone manages to fix it, I run for local mcp, but keeps getting Client Closed.
Can anyone help me?
Thanks
Hello, I have similar issue and same OS with you. Try to run the command and args in the mcp.json and you will find that it has some issues running command. Debug the problem with packages and relaunch the cursor should solve the problem
You can try to run the Command locally in your terminal and see if it works. If you manage to get it work then relaunch cursor and refresh it
Bug fixed.
Mind sharing the fix?
I spent a long time on this, as someone unfortunately using Windows, WSL, and VS Code’s containerization for their project. Ultimately I couldn’t find a fix, and went with a non-official version of Supabase MCP (googling will show it), which was working within 15 mins.
hello, i’m also encountering this issue in macos, and i tried use esbuild to bundle all files into one js bundle, for a stdio mcp, but cursor still error: [error] name: Error in MCP: Client closed
may i ask what do you mean bundle with eslint here? thank you!
Thanks @digitalcloud.no I was getting really frustrated with the client constantly closing. I spent a whole hour debugging in the Cursor console today 
, then did an old-fashioned Google search and found this simple answer. It is strange that “Enabled/Disabled” is not updating the JSON. However, adding “enabled”: true overwrites the ability to toggle “Enabled/Disabled.”
After testing, the setting “enabled”: true for persistence should be limited to the MCP tools you always use, such as the Claude Think tool, memory tool, and a search tool like Exa/Talvy. Additionally, and remind Cursor to actually use these tools in a .mdc rule file.
in Cursor menu → help → toggle dev tools. That will help you, work with the assistant. I suspect it is related to your python env. You dont have uv set up correctly. Also depending on what need from the MCP tool you are creating perhaps see if you can solve it with https://www.youtube.com/watch?v=JGphuBuKiDo&t=39s&ab_channel=echohive
I fix this on MacOS by doing
brew install node
and then restarting cursor!
i fix this by : rm -rf ~/.npm/_npx, then restart cursor
I fixed this on macos by setting a specific package version instead of @latest:
@supabase/[email protected]
it wasn’t working until I changed “1.2.0” to “latest” not sure why though but thank you!
I’ve been struggling with this same issue for the last two days. While using Gemini 2.5 may not be a cost-effective way to use Cursor, it’s tried a number of approaches, all without success.
Specifically:
1. Initial Problem:
openai-pdf in Cursor settings intended to run the Python script /Users/jeffwhite/openai-mcp-pdf/mcp_server.py.mcp_server.log initially), but this file was not being created, indicating the script was either not running at all or failing very early.2. Debugging and Manual Execution:
print() statements at the very start of mcp_server.py to see if the script execution even began.mcp_server.py to use logging.basicConfig with an absolute file path (/Users/jeffwhite/openai-mcp-pdf/mcp_server_debug.log) and filemode='w', removing the StreamHandler to isolate file logging.python3 (not python) was the correct command to invoke the desired Python interpreter on the user’s system.python3 mcp_server.py manually revealed a ModuleNotFoundError: No module named 'pdfplumber', indicating missing dependencies./Users/jeffwhite/openai-mcp-venv/.source /Users/jeffwhite/openai-mcp-venv/bin/activate && python3 /Users/jeffwhite/openai-mcp-pdf/mcp_server.py. This confirmed:
/Users/jeffwhite/openai-mcp-pdf/mcp_server_debug.log worked correctly during manual execution, logging startup messages up to the point where the script waits for MCP requests (Starting MCP request loop...).3. MCP Configuration Attempts in Cursor:
mcp.json) used /bin/bash -c to change directory and then execute the script using the virtual environment’s python: /bin/bash -c "cd /Users/jeffwhite/openai-mcp-pdf && /Users/jeffwhite/openai-mcp-venv/bin/python /Users/jeffwhite/openai-mcp-pdf/mcp_server.py". This failed with “Client closed”./Users/jeffwhite/.cursor/mcp.json to directly execute the Python interpreter from the virtual environment:
"command": "/Users/jeffwhite/openai-mcp-venv/bin/python""args": ["/Users/jeffwhite/openai-mcp-pdf/mcp_server.py"]mcp_server_debug.log file during these attempts by Cursor.4. Current State and Hypothesis:
mcp_server.py script functions correctly when launched manually from a terminal with the /Users/jeffwhite/openai-mcp-venv virtual environment activated.mcp.json (either via bash -c or direct Python execution), the process fails immediately (“Client closed”)./Users/jeffwhite/openai-mcp-pdf/), which could prevent load_dotenv() from finding the .env file needed for the OpenAI API key, causing an early crash before logging starts. (An attempt to explicitly set the dotenv path in the script was interrupted but could be relevant).poppler for pdf2image) might not be available in the PATH environment variable accessible to the process launched by Cursor, even if they are available in the user’s standard terminal PATH.This detailed breakdown should help illustrate that the script itself is viable, but fails specifically when launched via Cursor’s MCP mechanism under the tested configurations, pointing towards an issue in how Cursor handles the process execution environment for this specific setup.
Cursor details:
Version: 0.49.4 (Universal)
VSCode Version: 1.96.2
Commit: ec408037b24566b11e6132c58bbe6ad27046eb90
Date: 2025-04-22T00:33:06.906Z
Electron: 34.3.4
Chromium: 132.0.6834.210
Node.js: 20.18.3
V8: 13.2.152.41-electron.0
OS: Darwin arm64 24.4.0
Help in resolution is most appreciated.
Jeff
im using the the following on mac
{
"version": "1.0.0",
"mcpServers": {
"sql-explorer": {
"name": "SQL Database Explorer",
"version": "1.0.0",
"description": "SQLite database explorer with comprehensive query capabilities",
"command": "npx",
"args": ["-y", "ts-node", "server.ts", "--stdio"],
"env": {
"DATABASE_URL": "postgresql://db_user:db_pwd123@localhost:5477/qaworld?schema=public"
},
"capabilities": {
"resources": {
"schema": {
"description": "Get schema information for database objects",
"uriTemplate": "schema://{object}",
"parameters": {
"object": {
"type": "string",
"description": "Name of the database object (table, view, etc.)"
}
}
},
"table-preview": {
"description": "Preview data from a table",
"uriTemplate": "preview://{table}",
"parameters": {
"table": {
"type": "string",
"description": "Name of the table to preview"
}
}
}
},
"tools": {
"list_tables": {
"description": "Get a list of all tables in the database",
"parameters": {}
},
"describe_table": {
"description": "View schema information for a specific table",
"parameters": {
"table_name": {
"type": "string",
"description": "Name of the table"
}
}
},
"query": {
"description": "Execute SQL queries",
"parameters": {
"sql": {
"type": "string",
"description": "SQL query to execute"
}
}
},
"count-records": {
"description": "Count records in a table",
"parameters": {
"table": {
"type": "string",
"description": "Name of the table"
},
"where": {
"type": "string",
"description": "Optional WHERE clause",
"required": false
}
}
},
"insert-data": {
"description": "Insert data into a table",
"parameters": {
"table": {
"type": "string",
"description": "Target table name"
},
"data": {
"type": "object",
"description": "Data to insert (JSON object)"
}
}
},
"update-data": {
"description": "Update data in a table",
"parameters": {
"table": {
"type": "string",
"description": "Target table name"
},
"set": {
"type": "object",
"description": "Update values (JSON object)"
},
"where": {
"type": "string",
"description": "WHERE clause for the update"
}
}
},
"delete-data": {
"description": "Delete data from a table",
"parameters": {
"table": {
"type": "string",
"description": "Target table name"
},
"where": {
"type": "string",
"description": "WHERE clause for deletion"
}
}
}
}
}
}
},
"defaultServer": "sql-explorer",
"settings": {
"timeout": 30000,
"retryAttempts": 3,
"logLevel": "info"
}
}
still facing the same issue
Issue resolved by adding the absolute path of my server.ts not relative path on mac os
