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Using Cursor to Access TAU Token Endpoints via MCP

Prerequisites

  • Cursor⁠ installed.
  • An API key or JWT from TAU Studio⁠ or TAU Market.
  • npx⁠ or bunx⁠ installed and available in your path.
  • The @pinax/mcp package requires Node 18+, as it relies on built-in fetch() / Headers, which are not available in Node 17 or older. You may need to specify an exact path to an up-to-date Node version, or uninstall previous versions of Node to ensure @pinax/mcp uses the correct version.
Screenshot of Cursor's MCP configuration panel.

Configuration

Create or edit your ~/.cursor/mcp.json file.

Cursor Settings > MCP > Add new global MCP Server

mcp.json
{  "mcpServers": {    "tau-token": {      "command": "npx",      "args": ["@pinax/mcp", "--sse-url", "https://token.mcp.tau.org/sse"],      "env": {        "ACCESS_TOKEN": "<TAU API Key or JWT>"      }    }  }}

Troubleshooting

Cursor IDE error notification that reads, "Failed to create client"

To enable logs for the MCP, use the --verbose true option.

ENOENT

Try to use the full path of the command instead:

  • Run which npx or which bunx to get the path of the command.
  • Replace npx or bunx in the configuration file with the full path (e.g. /home/user/bin/bunx).

Server disconnected

Double-check your TAU API key. Otherwise, verify that https://token.mcp.tau.org/sse⁠ is reachable from your network.