B+

mcp.stackin.io

https://mcp.stackin.io/mcp
89/100 · MCP Trust Grade · checked 13d ago · MCP 2025-06-18

Is the mcp.stackin.io MCP server safe to use?

Independent trust grade B+ (89/100). No blocking issues found in the static + spec checks. wmcp.sh continuously watches mcp.stackin.io for tool drift and rug-pulls. The grade is free and identical whether or not the operator pays.

✓ Watched since 2026-10-16 — behavioral baseline locked. We re-check this server's tool surface on a schedule; if it adds, removes, or silently rewrites a tool (rug-pull), we record it.

What it offers — 16 tools · Developer Tools

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 inferr

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 municipalit

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 i

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

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 cancelle

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 S

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

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; thi

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 c

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 re

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

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

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 ove

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

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 —

Spec conformance20%80
Security (OWASP MCP)30%100
Reliability / performance20%70
Tool hygiene15%100
Transparency / provenance15%90

Observed behavior

No proxied traffic observed for this host yet. Connect it at /connect and its grade gains a measured Reliability score + per-tool behavioral evidence — the half a static scan can't produce.

Findings

No blocking issues found in the static + spec checks.
Grade another server

We re-grade mcp.stackin.io on a schedule and alert your Slack/webhook the moment its tools change or its grade drops — rug-pull insurance for the connection.

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MCP Trust report card — mcp.stackin.io grade B+
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MCP Trust Grade B+ · wmcp.sh
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Agents: check this before connecting

Add the wmcp.sh trust oracle as an MCP server and call grade_mcp_server / check_mcp_drift in your agent's pre-connection gate:

https://wmcp.sh/mcp/trust
How this grade is computed. An open, independent rubric — Spec conformance (20%), Security mapped to the OWASP MCP Top 10 (30%), Reliability (20%), Tool hygiene (15%), Transparency (15%) — run by connecting to the server and inspecting its real MCP surface. The grade is free and identical whether or not the operator pays. v1 uses static + spec signals from a single connection; continuous uptime, real latency, and annotation-truthing (declared readOnly vs observed behavior) layer on via the wmcp.sh proxy.