Report whether MERIT_API_ID and MERIT_API_KEY are configured, and explain how to set them when they are not.

Read-only tool. Read common master and reference data from Merit. Actions: customers_list: List customers with optional filters.; customer_groups_list: List customer groups.; vendors_list: List vendors with optional filters.; vendor_groups_list: List vendor groups.; items_list: List items with optional filters.; item_groups_list: List item groups.; taxes_list: List tax rates.; dimensions_list: List dimensions.; banks_list: List banks.; accounts_list: List accounts.; projects_list: List projects.; cost_centers_list: List cost centers.; departments_list: List departments.; units_list: List units of measure.; financial_years_list: List financial years.

Read-only tool. Read sales invoices, offers, and recurring invoice data. Actions: invoices_list: List sales invoices.; invoice_get: Fetch one sales invoice by id.; invoice_pdf_get: Fetch one sales invoice PDF by id.; offers_list: List sales offers.; offer_get: Fetch one sales offer by id.; recurring_invoices_list: List recurring invoices.; recurring_invoice_get: Fetch one recurring invoice by id.; recurring_invoice_addresses_list: List recurring invoice addresses.

Read-only tool. Read purchase invoices and purchase orders. Actions: invoices_list: List purchase invoices.; invoice_get: Fetch one purchase invoice by id.; orders_list: List purchase orders.

Read-only tool. Read payments, banks, and GL information. Actions: payments_list: List payments.; payment_types_list: List payment types.; payment_imports_list: List payment imports for a bank.; expense_payments_list: List expense payments for a bank.; income_payments_list: List income payments for a bank.; gl_batches_list: List GL batches.; gl_batch_get: Fetch one GL batch by id.; gl_batches_full_list: List GL batches with full details.

Read-only tool. Read inventory, fixed asset, and pricing data. Actions: locations_list: List inventory locations.; movements_list: List inventory movements.; fixed_asset_locations_list: List fixed asset locations.; fixed_asset_responsible_persons_list: List fixed asset responsible persons.; fixed_assets_list: List fixed assets.; prices_list: List prices.; discounts_list: List discounts.; price_get: Fetch an effective price.

Read-only tool. Read Merit reports and report continuations. Actions: customer_debts_get: Get customer debts report.; customer_payments_get: Get customer payment report.; more_data_get: Get continuation page for a report.; profit_report_get: Get statement of profit or loss.; balance_report_get: Get statement of financial position.; inventory_report_get: Get inventory report.; sales_report_get: Get sales report.; purchase_report_get: Get purchase report.

Preview-only write tool. Does not execute changes; returns intended operation details and a confirmation_code for merit_write_customers_confirm. Create or update customers. Actions: customer_upsert: Create or update a customer.

Confirmed mutating tool. Executes a previously previewed write operation from merit_write_customers when called with confirmation_code and confirmed=true. Create or update customers. Actions: customer_upsert: Create or update a customer.

Preview-only write tool. Does not execute changes; returns intended operation details and a confirmation_code for merit_write_sales_confirm. Create unsent accounting invoices, not unposted drafts. Delivery (email/e-invoice), deletion, and credit invoices are handled manually in Merit and are not exposed by this server. Actions: sales_invoice_create: Create an unsent accounting invoice through Merit v1 /sendinvoice, NOT an unposted draft. Restricted schema: Customer={Id: customer GUID}; DocDate, TransactionDate, DueDate as YYYYMMDD; InvoiceNo (string), CurrencyCode='EUR', PriceInclVat=false, singular InvoiceRow list, TaxAmount, TotalAmount (VAT-exclusive). Optional FComment and HComment text. Each row requires Item={Code, Description, UOMName}, Quantity>0, Price>=0, TaxId GUID, Account. Read items_list first; Code must exactly match an existing non-stock item. The server verifies items again at confirmation and refuses missing, stock, or unrecognized items. Do not supply Item.Type. Use InvoiceRow (singular), not InvoiceRows; UOMName belongs inside Item, not on the row. Resolve company-specific TaxId GUIDs via taxes_list; never invent them. TaxAmount entries are {TaxId, Amount>=0} and must cover exactly the row TaxIds. TotalAmount must be positive and match the sum of row Quantity × Price, rounded per row to cents. Unknown fields are rejected at every level, including Payment, AccountingDoc, DelivNote, discounts, rounding adjustments, and item-creation fields. Negative quantities/prices are not supported. Choose InvoiceNo using the company's numbering convention; no automatic allocation is provided. Confirmation creates a real, unsent accounting invoice in Merit. It can affect the ledger and reports before delivery; this is NOT an unposted draft. Only the preview is non-writing. Review before confirming; send manually in Merit.

Confirmed mutating tool. Executes a previously previewed write operation from merit_write_sales when called with confirmation_code and confirmed=true. Create unsent accounting invoices, not unposted drafts. Delivery (email/e-invoice), deletion, and credit invoices are handled manually in Merit and are not exposed by this server. Actions: sales_invoice_create: Create an unsent accounting invoice through Merit v1 /sendinvoice, NOT an unposted draft. Restricted schema: Customer={Id: customer GUID}; DocDate, TransactionDate, DueDate as YYYYMMDD; InvoiceNo (string), CurrencyCode='EUR', PriceInclVat=false, singular InvoiceRow list, TaxAmount, TotalAmount (VAT-exclusive). Optional FComment and HComment text. Each row requires Item={Code, Description, UOMName}, Quantity>0, Price>=0, TaxId GUID, Account. Read items_list first; Code must exactly match an existing non-stock item. The server verifies items again at confirmation and refuses missing, stock, or unrecognized items. Do not supply Item.Type. Use InvoiceRow (singular), not InvoiceRows; UOMName belongs inside Item, not on the row. Resolve company-specific TaxId GUIDs via taxes_list; never invent them. TaxAmount entries are {TaxId, Amount>=0} and must cover exactly the row TaxIds. TotalAmount must be positive and match the sum of row Quantity × Price, rounded per row to cents. Unknown fields are rejected at every level, including Payment, AccountingDoc, DelivNote, discounts, rounding adjustments, and item-creation fields. Negative quantities/prices are not supported. Choose InvoiceNo using the company's numbering convention; no automatic allocation is provided. Confirmation creates a real, unsent accounting invoice in Merit. It can affect the ledger and reports before delivery; this is NOT an unposted draft. Only the preview is non-writing. Review before confirming; send manually in Merit.