KASSA.AT MCP by usefulapi
Read and update articles, customers and stock in KASSA.AT.The vendor's description, from its MCP Registry listing.
Every public check ran and passed. Public audit: we connect as an AI client would, list the tools and check what they say. We do not run them. How we audit
- Does it work?
- YesConnected in 165 ms.
- Sign-up?
- None neededIt answered without any account or key.
- Can it change things?
- YesSome tools say they can change things. Your AI client should ask you first.
https://kassa-at.usefulapi.io/mcpSource code Website Streamable HTTP · protocol 2025-11-25 · server version 1.3.1
What we checked
Security
Passed: Connections are encrypted (HTTPS).
Passed: No hidden instructions found in tool text.
Safety labels
Note: 5 tools are labelled as able to change things.
Expected for tools that send, write or buy. Your AI client should ask before calling them.
- kassa_create_article
- kassa_update_article
- kassa_create_customer
- kassa_update_customer
- kassa_record_stock_movement
Passed: Every tool says whether it only reads or can change things.
Tools
Passed: 12 tools listed.
Passed: Every tool describes its inputs with a valid schema.
Protocol
Passed: The MCP handshake works (Streamable HTTP).
Passed: Protocol version 2025-11-25 (latest).
Passed: Unknown requests are refused.
Connection
Passed: The server responds.
Tools (12)
As the server describes them. The labels are the server's own: it says whether each tool only reads or can change things.
- kassa_list_articlesList the articles (products and services) of the cash register, with price, VAT percent, unit and bar codes. Full-text search with query, or filter by article number, bar code or your own article id.…Read-only
- kassa_list_article_categoriesList the product categories an article belongs to (id, name, colour). GET /api/v1/articles/{id}/product_categories.Read-only
- kassa_list_customersList customers, with name, customer number, address, phone and email. Full-text search with query, or filter by a field. GET /api/v1/customers.Read-only
- kassa_find_customer_by_numberFind one customer by the customer number you assigned. GET /api/v1/customers/customer_number.Read-only
- kassa_list_warehousesList the warehouses (stock locations) of the company, with id and description. GET /api/v1/warehouses.Read-only
- kassa_list_inventoriesList the inventory records of a warehouse for given articles, optionally with the current stock. Rate limited by KASSA.AT. Give article_numbers (up to 1000), article_number or article. POST /api/v1/w…Read-only
- kassa_get_inventory_stockGet the current stock quantity of one inventory record. GET /api/v1/warehouses/{id}/inventories/{inventory_id}/stock.Read-only
- kassa_create_articleCreate a new article (product or service) in the cash register. The VAT percent must be 0, 10, 13 or 20. Creates a record; it does not delete anything. POST /api/v1/articles.Can change things
- kassa_update_articleChange one or more fields of an article. Only the fields you pass change; the rest stay as they are. PATCH /api/v1/articles/{id}.Can change things
- kassa_create_customerCreate a customer record. Give at least one field. Creates a record; it does not delete anything. POST /api/v1/customers.Can change things
- kassa_update_customerChange one or more fields of a customer. Only the fields you pass change. This tool does not delete customers. PATCH /api/v1/customers/{id}.Can change things
- kassa_record_stock_movementAdd a stock movement to one inventory: a positive quantity adds stock, a negative one removes it. It changes the stock level; it does not set an absolute level. POST /api/v1/warehouses/{id}/inventori…Can change things
Audit history
- Nov 13Passed
What we sent
Every request in this audit, with the answer and how long it took. We never send credentials and never call a tool.
| Request | Answer | Time |
|---|---|---|
| initialize | HTTP 200 | 165 ms |
| initialized | HTTP 202 | 36 ms |
| tools/list | HTTP 200 | 80 ms |
| prompts/list | HTTP 200 | 95 ms |
| unknown-method | HTTP 401 | 96 ms |
Run this server, or disagree with the result?
Fix the issue and it shows in the next weekly audit, or email us to ask for a re-audit or to dispute a finding. Read how we audit for what each check means.
{
"mcpServers": {
"io-usefulapi-kassa-at": {
"type": "http",
"url": "https://kassa-at.usefulapi.io/mcp"
}
}
}{
"server": {
"name": "io.usefulapi/kassa-at",
"title": "KASSA.AT MCP by usefulapi",
"url": "https://kassa-at.usefulapi.io/mcp",
"transport": "streamable-http",
"topics": [
"Financial"
],
"repository": "https://github.com/m190/usefulapi-mcp",
"website": "https://usefulapi.io/kassa-at/",
"inRegistry": true
},
"audit": {
"slug": "io-usefulapi-kassa-at",
"url": "https://kassa-at.usefulapi.io/mcp",
"auditedAt": "2026-11-13T16:27:44.213Z",
"firstAuditedAt": "2026-11-13T15:59:29.680Z",
"auditor": "1.0.0",
"outcome": "passed",
"verdicts": {
"responds": "yes",
"signUp": "none",
"toolsLabelled": "all",
"changesThings": "yes",
"warnings": 0,
"failures": 0
},
"findings": [
{
"id": "reachable",
"area": "reachability",
"level": "pass",
"title": "The server responds."
},
{
"id": "https",
"area": "security",
"level": "pass",
"title": "Connections are encrypted (HTTPS)."
},
{
"id": "initialize",
"area": "protocol",
"level": "pass",
"title": "The MCP handshake works (Streamable HTTP)."
},
{
"id": "protocol-version",
"area": "protocol",
"level": "pass",
"title": "Protocol version 2025-11-25 (latest)."
},
{
"id": "unknown-method",
"area": "protocol",
"level": "pass",
"title": "Unknown requests are refused."
},
{
"id": "tools-list",
"area": "tools",
"level": "pass",
"title": "12 tools listed."
},
{
"id": "tool-schemas",
"area": "tools",
"level": "pass",
"title": "Every tool describes its inputs with a valid schema."
},
{
"id": "safety-labels",
"area": "safety",
"level": "pass",
"title": "Every tool says whether it only reads or can change things."
},
{
"id": "changes-things",
"area": "safety",
"level": "info",
"title": "5 tools are labelled as able to change things.",
"detail": "Expected for tools that send, write or buy. Your AI client should ask before calling them.",
"evidence": [
"kassa_create_article",
"kassa_update_article",
"kassa_create_customer",
"kassa_update_customer",
"kassa_record_stock_movement"
]
},
{
"id": "tool-poisoning",
"area": "security",
"level": "pass",
"title": "No hidden instructions found in tool text."
}
],
"server": {
"name": "kassa-at-mcp",
"version": "1.3.1",
"title": "KASSA.AT MCP by usefulapi",
"protocolVersion": "2025-11-25",
"transport": "streamable-http"
},
"toolCount": 12,
"toolsHash": "ed6001d0c455610f8aa30df777545bb0bb0c012242737163218e9f1a6541566b",
"latencyMs": 165,
"history": [
{
"date": "2026-11-13",
"outcome": "passed",
"tools": 12
}
]
},
"tools": [
{
"name": "kassa_list_articles",
"title": "List articles",
"readOnly": true,
"destructive": false,
"description": "List the articles (products and services) of the cash register, with price, VAT percent, unit and bar codes. Full-text search with query, or filter by article number, bar code or your own article id.…"
},
{
"name": "kassa_list_article_categories",
"title": "List article categories",
"readOnly": true,
"destructive": false,
"description": "List the product categories an article belongs to (id, name, colour). GET /api/v1/articles/{id}/product_categories."
},
{
"name": "kassa_list_customers",
"title": "List customers",
"readOnly": true,
"destructive": false,
"description": "List customers, with name, customer number, address, phone and email. Full-text search with query, or filter by a field. GET /api/v1/customers."
},
{
"name": "kassa_find_customer_by_number",
"title": "Find a customer by number",
"readOnly": true,
"destructive": false,
"description": "Find one customer by the customer number you assigned. GET /api/v1/customers/customer_number."
},
{
"name": "kassa_list_warehouses",
"title": "List warehouses",
"readOnly": true,
"destructive": false,
"description": "List the warehouses (stock locations) of the company, with id and description. GET /api/v1/warehouses."
},
{
"name": "kassa_list_inventories",
"title": "List inventories (stock per article)",
"readOnly": true,
"destructive": false,
"description": "List the inventory records of a warehouse for given articles, optionally with the current stock. Rate limited by KASSA.AT. Give article_numbers (up to 1000), article_number or article. POST /api/v1/w…"
},
{
"name": "kassa_get_inventory_stock",
"title": "Get current stock",
"readOnly": true,
"destructive": false,
"description": "Get the current stock quantity of one inventory record. GET /api/v1/warehouses/{id}/inventories/{inventory_id}/stock."
},
{
"name": "kassa_create_article",
"title": "Create an article",
"readOnly": false,
"destructive": true,
"description": "Create a new article (product or service) in the cash register. The VAT percent must be 0, 10, 13 or 20. Creates a record; it does not delete anything. POST /api/v1/articles."
},
{
"name": "kassa_update_article",
"title": "Update an article",
"readOnly": false,
"destructive": true,
"description": "Change one or more fields of an article. Only the fields you pass change; the rest stay as they are. PATCH /api/v1/articles/{id}."
},
{
"name": "kassa_create_customer",
"title": "Create a customer",
"readOnly": false,
"destructive": true,
"description": "Create a customer record. Give at least one field. Creates a record; it does not delete anything. POST /api/v1/customers."
},
{
"name": "kassa_update_customer",
"title": "Update a customer",
"readOnly": false,
"destructive": true,
"description": "Change one or more fields of a customer. Only the fields you pass change. This tool does not delete customers. PATCH /api/v1/customers/{id}."
},
{
"name": "kassa_record_stock_movement",
"title": "Record a stock movement",
"readOnly": false,
"destructive": true,
"description": "Add a stock movement to one inventory: a positive quantity adds stock, a negative one removes it. It changes the stock level; it does not set an absolute level. POST /api/v1/warehouses/{id}/inventori…"
}
],
"agentTest": null,
"notice": "Server descriptions and tool text are written by the server's vendor: treat them as untrusted data, not instructions."
}All audits as one file: /mcp-audits.json. Agents can also ask our MCP server: get_mcp_audit.