Stackin

What you can ask

• Cancel an authorized document, with confirmation.Copy

  Example path get_invoice_pdf · Cancel invoice skill

• Confirm a recipient before invoicing them.
• File a correction letter for wording, not for values.
• Explain why a document was rejected and what to fix.
• Resolve the NCM, CFOP or CEST a document needs.
• Show a document's current state.
• Issue an invoice for goods sold.
• Issue an invoice for services rendered.
• Declare this company's position on a supplier's NF-e.
• Show the company's latest documents.

MCP connector

Server URL

https://mcp.stackin.io/mcpCopy

Login

None

Protocol

MCP 2025-11-25

Instructions

Issue, consult and cancel Brazilian fiscal documents through the Stackin API: NFS-e for services and NF-e for goods. Every amount is in BRL.

Correction letters, numbering invalidation and recipient manifestations are NF-e only — an NFS-e has none of them, and a wrong one there is cancelled and issued again.

An NF-e needs an ncm and a cfop on every item and a complete recipient address; the SEFAZ refuses a partial one. Never infer either code — they decide the tax owed.

An issued document is legally binding: confirm the data with the user rather than inferring it.

Tools

Skills

9 in the Claude listing

• Cancel invoiceCancel an authorized fiscal document, or file a correction letter when cancelling is not what the situation needs.
• Consult invoiceFind a fiscal document and report its current state, by access key or by searching the company's history.
• Correct invoiceFile a correction letter (CC-e) against an authorized NF-e — and know when a correction is not what the situation needs.
• Diagnose invoiceExplain why a fiscal document was rejected and what has to change, using what the tax authority actually answered.
• Fiscal lookupResolve an NCM, CFOP, CEST or other published fiscal code before it goes on a document, instead of guessing one.
• Invalidate numberingDeclare an NF-e numbering range that was reserved and never used, so the gap is explained to the SEFAZ.
• Issue invoiceIssue a Brazilian fiscal document — an NF-e for goods or an NFS-e for services — checking the data before it reaches the tax authority.
• Received invoicesRead the NF-e documents other companies issued against this one, and file the company's position on them.
• Taxpayer lookupConfirm who a tax id belongs to before invoicing them, by exact match against the taxpayer registry.