Cursor-agent MCP load error

Bug Reports
1

Where does the bug appear (feature/product)?

Cursor CLI

Describe the Bug

MCP error -32000: Connection closed shows immediately when I run cursor-agent, although on the Cursor IDE MCP servers work fine.

Steps to Reproduce

Run the cursor CLI agent:

cursor-agent

My mcp.json with cat ~/.cursor/mcp.json

{
  "mcpServers": {
    "context7": {
      "command": "npx",
      "args": ["-y", "@upstash/context7-mcp@latest"]
    },
    "github": {
      "command": "npx",
      "args": ["@modelcontextprotocol/server-github"],
      "env": {
        "GITHUB_PERSONAL_ACCESS_TOKEN": "..."
      }
    },
    "o3": {
      "type": "stdio",
      "command": "npx",
      "args": ["o3-search-mcp"],
      "env": {
        "OPENAI_API_KEY": "...",
        "SEARCH_CONTEXT_SIZE": "medium",
        "REASONING_EFFORT": "medium"
      }
    },
    "o3-low": {
      "type": "stdio",
      "command": "npx",
      "args": ["o3-search-mcp"],
      "env": {
        "OPENAI_API_KEY": "...",
        "SEARCH_CONTEXT_SIZE": "low",
        "REASONING_EFFORT": "low"
      }
    },
    "o3-high": {
      "type": "stdio",
      "command": "npx",
      "args": ["o3-search-mcp"],
      "env": {
        "OPENAI_API_KEY": "...",
        "SEARCH_CONTEXT_SIZE": "high",
        "REASONING_EFFORT": "high"
      }
    },
    "gemini-cli": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "gemini-mcp-tool"],
      "env": {
        "GEMINI_API_KEY": "..."
      }
    },
    "serena": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "--from",
        "git+https://github.com/oraios/serena",
        "serena-mcp-server",
        "--context",
        "ide-assistant"
      ],
      "env": {}
    },
    "cloud-run": {
      "command": "npx",
      "args": ["-y", "https://github.com/GoogleCloudPlatform/cloud-run-mcp"]
    },
    "cloud-sql-postgres": {
      "command": "...",
      "args": ["--prebuilt", "cloud-sql-postgres", "--stdio"],
      "env": {
        "CLOUD_SQL_POSTGRES_PROJECT": "...",
        "CLOUD_SQL_POSTGRES_REGION": "...",
        "CLOUD_SQL_POSTGRES_INSTANCE": "...",
        "CLOUD_SQL_POSTGRES_DATABASE": "...",
        "CLOUD_SQL_POSTGRES_USER": "...",
        "CLOUD_SQL_POSTGRES_PASSWORD": "..."
      }
    },
    "RadonAi": {
      "url": "http://127.0.0.1:63266/mcp",
      "type": "http",
      "headers": {
        "nonce": "..."
      }
    },
    "codex": {
      "type": "stdio",
      "command": "codex",
      "args": ["mcp"]
    }
  }
}

Expected Behavior

Load the whole MCP server without the error.

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

cursor-agent --version 2025.10.02-bd871ac

Does this stop you from using Cursor

Sometimes - I can sometimes use Cursor

2

Hey, thanks for the report. The team is already aware of this, we’ll fix it.

1 Like
3

Is there already a fix?

When I try to run:

cursor-agent mcp list

I get the following error:
Failed to list MCP servers: fetch failed

4

It’s still failed.