Connects Claude directly to QuickBooks Online via the Intuit REST API with OAuth2 authentication. The free tier gives you read access to invoices, expenses, account balances, transactions, and customer data. Premium tier adds P&L, balance sheet, cash flow reports, AR/AP aging, and write operations like creating invoices, recording payments, and logging expenses. Tokens are encrypted at rest with auto-refresh, and rate limiting is built in. Setup requires creating a QuickBooks developer app, running an OAuth flow to get your realm ID, and dropping credentials into your Claude Desktop config. If you're doing bookkeeping through natural language instead of clicking through the QuickBooks UI, this handles the API plumbing.
claude mcp add --transport stdio nyxtoolsdev-quickbooks-mcp-server -- uvx quickbooks-mcp