Cursor Agent
05829c0032
Brex ships an official remote MCP server over Streamable HTTP with per-user OAuth, so the plugin is a URL-only mcp.json with no variables block. Co-authored-by: Roshan Sadanani <roshansada@users.noreply.github.com>
Brex
Cursor plugin that connects agents to Brex through Brex's official remote Model Context Protocol server.
Query company spend — expenses, receipts, bills, vendors, cards, balances, and travel — and annotate expenses, all within your own Brex permissions.
Install
- Open Cursor Settings → Plugins.
- Search for Brex.
- Click Install, then complete the Brex sign-in prompt.
Or run /add-plugin brex in chat.
MCP
{
"mcpServers": {
"brex": {
"type": "http",
"url": "https://api.brex.com/mcp"
}
}
}
Auth is OAuth with Dynamic Client Registration. Cursor registers itself and prompts for Brex sign-in when the plugin connects — there is no API key or client ID to configure.
Before you connect
Two one-time admin steps gate the whole account. An account or card admin has to accept the Developer API agreement under Settings → Developer, then enable Brex in AI assistants under Settings → Beta features. After that, any employee can connect with their own credentials.
What agents can do
| Category | Capabilities |
|---|---|
| Expenses | List and inspect expenses, run expense analytics, and browse expense and merchant categories |
| Bills & vendors | List and inspect bills, vendors, and payables |
| Cards & limits | Card details and spend limits |
| Banking | Account balances and cash details |
| Travel | Trips and bookings |
| Org | Users, departments, and locations |
The hosted runtime is the source of truth for tool names and schemas. Call list_expense_categories as a read-only smoke test after connecting.
Notes
- Tool calls run as the Brex user who authorizes the connection and are scoped to that user's existing Brex capabilities.
- Writes are narrow: expense metadata such as memos, receipts, and attendees. The server cannot move money, issue cards, or pay bills.
- Approvals and card management are not exposed over MCP yet.
- Brex labels the MCP server as beta, so the tool catalog can change.
Docs
- Brex MCP server: https://developer.brex.com/docs/mcp
- Server URL: https://api.brex.com/mcp
Logo is Brex's official mark, from the brexhq GitHub organization.
License
MIT