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MCP live MCP 2025-11-25 streamable-http

Stackin

io.github.stackin-io/stackin

Issue and manage Brazilian fiscal documents: NF-e for goods, NFS-e for services.

Watch this dependency Share evidence report
Uptime
100.0%
5 direct probes · 30d
Response
3532ms
last probe
Tools
16
callable
Resources
0
readable
Prompts
10
available
Primary URL
https://mcp.stackin.io/mcp
Score: 100/100
Handshake verified by our own probe.
pass Answers the MCP handshake 50/50
The handshake and the list calls succeeded on the primary URL.
pass Lists tools, resources or prompts 30/30
16 tools, 0 resources, 10 prompts returned.
pass 3 or more catalogue items 10/10
26 items in total; 3 or more earns these points.
pass Describes itself 10/10
80 characters; more than 30 earns these points.

Tools · 16

issue_invoice

Issue a Brazilian fiscal document: NFS-e or NF-e. This produces a legal fiscal document. Confirm the data with the user before calling when you inferred any field. Every item needs a price: unit_pri…

consult_invoice

Look up an invoice's current status by its access key. Read-only: it never changes the document.

cancel_invoice

Cancel an authorized invoice. Legal cancellation, with fiscal and accounting effect, inside a window the NFS-e authorizer enforces for the municipality. Ask the human to confirm before calling; never…

get_invoice_pdf

Return the printable rendering of a document, as a PDF. Works for both types — a DANFE for nfe, a DANFSe for nfse. The PDF comes back base64-encoded in content_base64; the XML, not this, is the legal…

reissue_invoice

Retry a rejected invoice after the data that caused the rejection was fixed. Takes the local invoice_id, not the access key: a rejected document never got one. Consumes a credit like a new issuance, …

correct_invoice

File an electronic correction letter (CC-e) against an NF-e. NF-e only: there is no correction letter for an NFS-e, where a wrong document is cancelled and issued again. It corrects wording and non-…

invalidate_numbering

Declare an NF-e numbering range reserved but never used. NF-e numbering has to be continuous, so a gap left by a failed issuance is explained to the SEFAZ with this — not with a new document. Irrever…

list_invoices

List the invoices this company issued, newest first. One document type at a time: pass nfse for services or nfe for goods. A company that issues both has to be asked twice. Use it for "my last invoi…

get_invoice_submissions

Show every attempt made for one invoice and what came back. This is the tool that answers "why was it rejected". consult_invoice gives the status; this gives the tax authority's own code, its message…

validate_invoice_payload

Check invoice data against the field rules without issuing anything. Nothing is sent to the tax authority and no document is created. The SDK models check field formats, and for nfe the rules the SEF…

list_received_invoices

List NF-e documents other companies issued against this one. The mirror of list_invoices: that one shows what this company issued, this one what it received. Read-only. It reads what the API already…

manifest_received_invoice

Declare this company's position on a document issued against it. Legally binding and irreversible once the tax authority accepts it — ask the human to confirm before calling, and read back which docu…

lookup_fiscal_code

Resolve one code of one classification, when you know both. Use this to confirm a code before putting it on a document — an NCM that does not exist is rejected by the tax authority after issuing, whi…

search_fiscal_codes

Find a code from a description, or page through a table. This is the tool for "what NCM is a keyboard" — the one the user actually asks. Prefer it over guessing a code from memory: the tables change,…

list_fiscal_kinds

Which classifications this country has data for, right now. Ask this before assuming a classification exists. The answer grows as the source data does, so a name absent here is absent today rather th…

lookup_taxpayer

Look up one taxpayer by exact tax id, to confirm who it is. Use it to check a recipient's name before issuing against them. It takes the id exactly — punctuation is fine, but there is no search by na…

Prompts · 10

issue_nfse

Issue an invoice for services rendered.

issue_nfe

Issue an invoice for goods sold.

find_fiscal_code

Resolve the NCM, CFOP or CEST a document needs.

check_taxpayer

Confirm a recipient before invoicing them.

recent_invoices

Show the company's latest documents.

diagnose_rejection

Explain why a document was rejected and what to fix.

inspect_invoice

Show a document's current state.

correct_nfe

File a correction letter for wording, not for values.

manifest_received

Declare this company's position on a supplier's NF-e.

cancel_invoice_prompt

Cancel an authorized document, with confirmation.

How to use

Claude Desktop or claude.ai: add a custom connector (Customize → Connectors; on Team and Enterprise plans an owner adds it under Organization settings → Connectors) with this server URL: https://mcp.stackin.io/mcp

Cursor or Cline: add to your MCP config:

{
  "mcpServers": {
    "stackin": {
      "url": "https://mcp.stackin.io/mcp",
      "transport": "streamable-http"
    }
  }
}