Overview
Ledger is an accounting platform built for accounting firms. This connector lets Claude read a firm's books directly: trial balance, profit & loss, balance sheet and cash flow for any client company, along with sales invoices, supplier bills, customers and suppliers. Two capabilities have no real equivalent elsewhere. Firm-wide views answer questions that normally mean a spreadsheet — “which of my clients has the largest overdue receivables?” spans an entire client portfolio in a single question, each business reported in its own currency. And every document carries a tamper-evident, hash-chained audit trail, so “prove this invoice was not altered after it was approved” is answerable live. The connector is read-only. No tool can create, modify, approve, post or delete anything. Access is granted per business. After signing in, a consent screen lists every business the account can reach, each with a checkbox — whatever is left unticked is not merely hidden from the interface, it is unreachable at the API layer. Three independent gates apply to every call: the OAuth grant, the token's entity scope, and the user's own per-entity permission in Ledger. Reporting is governed by a separate permission, so an account can legitimately read invoices while being refused the trial balance. A refusal returns plain language, never a raw error code. Authentication is OAuth 2.1 with dynamic client registration, PKCE and resource indicators — there is no client ID or secret to obtain and nothing to configure in Ledger beforehand. All customer data is stored in the EU.
