Qbo

The Model Context Protocol server for QuickBooks Online. Plug Claude into your books — customers, vendors, invoices, bills, and the chart of accounts — read-only, in five minutes.

License: MIT Python 3.10+ MCP

Why this exists

Roughly seven million businesses keep their books in QuickBooks Online. Intuit publishes a capable REST API but no official MCP server, so every team that wants Claude (or any MCP-aware AI assistant) to see their books ends up writing the same OAuth-and-pagination glue from scratch.

If you use Claude to operate finance day-to-day — chasing AR, sanity-checking AP, prepping for a board update — that gap is the difference between "how much did Acme owe us at the end of March?" working out of the box and "how much did Acme owe us at the end of March?" requiring a custom integration.

qbo-mcp closes that gap. It's a tiny, well-tested, MIT-licensed MCP server that exposes eight read-only QBO endpoints to any MCP client. Built from years of running production QBO automation against real money flow — every edge that surfaced in production (token rotation, 429 backoff, mid-page expiry, query-string escaping) is handled in client.py so you don't have to learn it the hard way.

What you can do with it

Wire this server into Claude Code, Claude Desktop, or any MCP host, then ask things like:

• "Find every customer matching 'Acme' and show me their balances."
• "How much do we owe WidgetCo right now? List the open bills."
• "Pull all unpaid invoices created this month and group them by customer."
• "What does our chart of accounts look like? List every Bank and Other Current Asset account with its current balance."
• "Compare last week's bill volume to the same week last month."

Claude reads your books directly. No copy-paste, no spreadsheets, no custom pipelines.

Tools (v0.1, all read-only)

Tool	What it does
qbo_search_customers	Find customers by display name (substring, case-insens).
qbo_get_customer	Fetch one customer by Id.
qbo_search_vendors	Find vendors by display name.
qbo_get_vendor	Fetch one vendor by Id.
qbo_search_invoices	List invoices in a date window, optionally open/paid.
qbo_get_invoice	Fetch one invoice by Id, including line items.
qbo_search_bills	List bills in a date window, optionally open/paid.
qbo_get_chart_of_accounts	Return the active chart of accounts with balances.

Write endpoints (create invoice, create bill, post journal entry) are intentionally not in v0.1. They are planned for v0.2 once read-only ergonomics settle. We will not ship a write tool that reaches into your books until the read surface has been beaten on for a release cycle.

Install

pip install qbo-mcp

v0.1 ships from this repository. PyPI publication is pending — for now, install with pip install git+https://github.com/alveyautomation/qbo-mcp or clone and run pip install -e . locally.

One-time OAuth setup

QBO uses OAuth 2.0 with rotating refresh tokens. You only do this dance once, then qbo-mcp keeps itself authenticated forever (as long as it runs at least once every 100 days). Total time: about 60 seconds.

1. Create an app at https://developer.intuit.com/. Pick the Accounting scope. Copy the client_id and client_secret.
2. Visit the OAuth Playground at https://developer.intuit.com/app/developer/playground. Select your app, pick the environment (Sandbox or Production), and click Get Authorization Code. Sign in to the QuickBooks company you want to expose.
3. Exchange the code for tokens — the Playground does this for you. Copy:
   • refresh_token (long string, lasts 100 days of inactivity)
   • realmId (numeric, identifies your QBO company)
4. Save them to .env:

QBO_CLIENT_ID=ABxxxxxxxxxxxxxx
QBO_CLIENT_SECRET=xxxxxxxxxxxxxxxx
QBO_REFRESH_TOKEN=ABxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
QBO_REALM_ID=1234567890123456
QBO_ENVIRONMENT=production       # or "sandbox"

That's it. The first tool call exchanges the refresh token for an access token; subsequent calls reuse the cached access token until it expires (~55 minutes), at which point the client refreshes silently.

Refresh-token rotation: Intuit issues a new refresh token on every refresh and immediately invalidates the old one. If your deployment runs in a single long-lived process, this is invisible. If your deployment restarts often (containers, serverless), persist the rotated token. Subscribe to QBOClient(on_refresh_token_rotated=…) to capture every rotation. See SECURITY.md for the full story.

Wire into Claude Code

Add to ~/.claude/claude_code_config.json (or your project's MCP config):

{
  "mcpServers": {
    "qbo": {
      "command": "qbo-mcp",
      "env": {
        "QBO_CLIENT_ID": "ABxxxxxxxxxxxxxx",
        "QBO_CLIENT_SECRET": "xxxxxxxxxxxxxxxx",
        "QBO_REFRESH_TOKEN": "ABxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
        "QBO_REALM_ID": "1234567890123456",
        "QBO_ENVIRONMENT": "production"
      }
    }
  }
}

Restart Claude Code. The eight qbo_* tools will appear in any new session.

Wire into Claude Desktop

Edit ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows) and add the same mcpServers block as above. Restart the desktop app.

Tool reference

Every tool returns a JSON envelope:

{ "ok": true,  "data": { ... } }
{ "ok": false, "error": "human-readable message" }

qbo_search_customers

qbo_search_customers(query: str, limit: int = 50)

Substring match against Customer.DisplayName. The query is escaped before embedding into QBO's query language, so apostrophes (O'Brien) and underscores (acme_test) are safe.

Example response:

{
  "ok": true,
  "data": {
    "customers": [
      { "Id": "1001", "DisplayName": "Acme Corp", "Balance": 1250.00 }
    ],
    "count": 1,
    "query": "acme",
    "limit": 50
  }
}

qbo_get_customer

qbo_get_customer(customer_id: str)

Fetches the full customer record by Id. Returns data: null when the Id does not exist (404).

qbo_search_vendors / qbo_get_vendor

Symmetric to the customer pair, but against the Vendor entity.

qbo_search_invoices

qbo_search_invoices(
    date_from: str,                     # ISO date "YYYY-MM-DD"
    date_to: str,                       # ISO date "YYYY-MM-DD"
    status: str | None = None,          # "open" | "paid" | None
    limit: int = 200,                   # max 2000
)

Window is inclusive on Invoice.TxnDate. The status filter is a convenience over QBO's Balance field — "open" returns invoices with Balance > 0, "paid" returns invoices with Balance = 0.

Pagination is handled transparently: QBO's query endpoint requires explicit STARTPOSITION / MAXRESULTS clauses, and the client walks pages until either limit is reached or the upstream returns a short page. The response includes limit_reached: true when limit was the stopping condition.

qbo_get_invoice

qbo_get_invoice(invoice_id: str)

Returns the full invoice record (with Line[]), or data: null for a 404.

qbo_search_bills / qbo_get_invoice parity

qbo_search_bills mirrors qbo_search_invoices but against the Bill entity (vendor-side). Same date semantics, same status filter.

qbo_get_chart_of_accounts

qbo_get_chart_of_accounts()

Returns every active account in the realm. Each record includes Id, Name, AccountType, AccountSubType, Classification, and CurrentBalance among other QBO fields. Useful for grounding any "where did this transaction post?" question.

Local development

git clone https://github.com/alveyautomation/qbo-mcp
cd qbo-mcp
python -m venv .venv && source .venv/bin/activate    # Windows: .venv\Scripts\activate
pip install -e ".[dev]"
pytest                                                # 50+ tests, ~3s

Pre-commit hooks (gitleaks, trufflehog, ruff, formatter, tenant-fingerprint scrubber):

pip install pre-commit
pre-commit install

Integration tests against a real QBO sandbox realm are gated behind QBO_INTEGRATION_TESTS=1. They are not required for normal contribution.

Troubleshooting

Failed to refresh QBO access token — refresh token has been rotated out from under you, or the app's client_id / client_secret is wrong. Refresh tokens are invalidated as soon as a new one is issued, so if two processes share a refresh token, whichever one refreshes first wins. Solution: persist rotated tokens (see on_refresh_token_rotated) or run only one server per refresh-token credential.

Missing required environment variables — the server tried to start before its .env was loaded. Either export the vars in the parent shell, or ensure your MCP host config includes them in the env block.

Empty results despite known data — confirm QBO_ENVIRONMENT matches the credential. A sandbox refresh token against the production API host (or vice versa) will authenticate but return an empty company.

Slow large date windows — QBO's query endpoint paginates at a hard cap of 1000 rows per page. The client walks pages transparently, but a 5-year invoice scan still means many round-trips. Consider tightening date_from / date_to or filtering by status.

Transient QBO error: HTTP 429 — Intuit's rate limiter kicked in. The client retries automatically with exponential backoff; if you see this surface in tool output, you've exceeded the configured QBO_MAX_RETRIES. Bump it or slow down your queries.

Contributing

Issues and pull requests welcome. Please:

• Run pytest before opening a PR (pip install -e ".[dev]").
• Run pre-commit run --all-files.
• Keep additions to v0.1 scope read-only. Write endpoints land in v0.2.
• Synthetic data only in tests — no real customer names, vendor names, or realm IDs.

License

MIT — see LICENSE.

Disclaimer

qbo-mcp is an unofficial, third-party integration. It is not endorsed by, affiliated with, or supported by Intuit Inc. "QuickBooks" and "QuickBooks Online" are trademarks of Intuit Inc. Use at your own risk; verify behavior against your realm before depending on it for production decisions.