Cursor

Cursor supports Streamable HTTP MCP servers natively.

Setup

1. Open or create ~/.cursor/mcp.json (global, recommended) or .cursor/mcp.json in your project root
2. Add the following configuration:

Caution

If you use the project-local path, make sure .cursor/mcp.json is in your .gitignore so you don’t accidentally commit your token.

{
  "mcpServers": {
    "upstream": {
      "url": "https://api.upstream.do/mcp",
      "headers": {
        "Authorization": "Bearer <your-token>"
      }
    }
  }
}

Replace <your-token> with your Personal Access Token.

4. Restart Cursor

The 44 Upstream tools will appear in the MCP tool list and your AI assistant can use them automatically.

Verify it works

After restarting, ask Cursor’s AI assistant:

“Use the Upstream MCP to show me my inbox”

You should see tool calls to list-inbox-splits and get-inbox-split-threads in the response.

Try these prompts

• “Show me what needs my reply”
• “Search my inbox for the Q3 proposal”
• “Summarize that long thread from Sarah”
• “Draft a reply to the investor update”
• “Snooze this thread until Monday at 9am”
• “Create a rule to auto-label emails from GitHub”