UCP status report

leontyna.cz

Q: What is a UCP profile?

The JSON file a store publishes at /.well-known/ucp to tell UCP agents which services it offers, how to call them and how it takes payment. The spec calls it the business profile. leontyna.cz's is 1.6 KB, written for UCP 2026-08-25. What goes in a UCP profile.

Q: How was leontyna.cz checked?

With public requests on 25 Oct 2026: we read /.well-known/ucp and robots.txt, validated the profile against UCP 2026-08-25, checked that its spec and schema links resolve. No sign-in and no purchase. How we check.

Verified

leontyna.cz publishes a valid UCP profile, but one thing in it breaks the spec: an agent that follows the rules won't find it at leontyna.cz.

ShoptetRESTHTTP 200 in 735 msrelease 2026-08-25

UCP Score 88/100 grade A · ready for UCP agents To fix 4 1 breaks the spec

Passed 12 checks

Checked 25 Oct 03:16 UTC · public requests

Findings

12 passed · 4 to fix · 1 note

Discovery

Problem

The profile sits behind a redirect

/.well-known/ucp

leontyna.cz/.well-known/ucp answers 301 redirect. The spec forbids redirects on the profile, so an agent that asks leontyna.cz stops there. Serve it directly on every host agents use. How to fix →

/.well-known/ucp

To fix

The profile has no ETag or Last-Modified header

Spec level: SHOULD. Not part of the UCP Score. How to fix →

HTTPS

https

Profile URL uses https://

https

UCP profile reachable

/.well-known/ucp

HTTP 200

/.well-known/ucp

AI bot access

robots.txt

robots.txt allows /.well-known/ucp

robots.txt

UCP profile

To fix

Publish the public keys agents use to check your messages

keys

Your UCP profile lists no public keys, so an agent cannot confirm that a message really came from your store. How to fix →

keys

Profile passes schema validation

ucp

No structural errors

ucp

Protocol version present and well-formed

ucp.version

Version: 2026-08-25

ucp.version

Services

Note

Confirm checkout-link redirect strategy

payment_handlers is present but empty — agents will not be able to complete purchases via tokenized payment flow. If this store uses checkout-link redirects, this is expected.

Capabilities declared

capabilities

3 of 6 capability families detected: Checkout, Cart Management, Catalog. A family counts once however many namespaces or extensions declare it.

capabilities

Checkout capability

shopping.checkout

dev.ucp.shopping.checkout detected

shopping.checkout

Transports declared

services

REST

services

Outside UCP

To fix

Publish a /llms.txt brand brief

/llms.txt

No /llms.txt file detected at the root of your domain. How to fix →

/llms.txt

sitemap.xml

/sitemap.xml

Found at /sitemap.xml

/sitemap.xml

Open Graph tags

og: meta

og:title and og:type/url present

og: meta

Organization schema (JSON-LD)

JSON-LD

Organization-typed JSON-LD detected

JSON-LD

Mobile viewport meta

meta viewport

meta viewport

Check trace

How leontyna.cz answered our check

The five ways an agent can reach this store, what each one met, and every request we made.

0 of 5 open · 1 breaks the spec
5 requests · 735 ms at the store · public requests only

01Hosting ↗

Finding the profile

Redirect
02Identity Linking ↗

Acting for the buyer

Not offered
03Embedded ↗

In the buyer's browser

Not offered
04Services ↗

Calling its services

Declared
05continue_url ↗

Sending the buyer to the website

Not declared

UCP Checkerpublic requests

3 requestsFinding the profile301 → 200
read from profileActing for the buyernot declared
read from profileIn the buyer's browsernot declared
not calledCalling its servicesREST · declared · 0 tools
read from profileSending to the websitenot declared
2 requestsOutside UCPhomepage · /llms.txt

Redirect

01 · Finding the profile3 requests

Only served after a redirect. An agent that follows the spec asks leontyna.cz, gets the redirect and stops: the spec forbids redirects on the profile.

leontyna.cz301 redirect after the redirect200

Not offered

02 · Acting for the buyerread from profile

The profile doesn't declare identity linking, so an agent can't act for a signed-in buyer.

Not offered

03 · In the buyer's browserread from profile

No Embedded service is declared.

Declared

04 · Calling its servicesnot called

The REST service is declared; not called by this check.

Not declared

05 · Sending the buyer to the websiteread from profile

No permalink declared. Whether error replies carry a continue_url shows only in an agent run.

01 PROFILEGET leontyna.cz/.well-known/ucp → 301 redirect–
01 PROFILEAfter the redirect, GET /.well-known/ucp → 200, 1.6 KB of JSON735 ms
01 PROFILEGET /robots.txt → allows /.well-known/ucp–
01 PROFILEValid against the 2026-08-25 schema; no keys publishedlocal
OUTSIDE UCPGET / → 200, Organization schema found–
OUTSIDE UCPGET /llms.txt → 200, not found–

MCP tools

0 listed · 0 of 12 the spec expects

The tools leontyna.cz's MCP service listed when we asked (tools/list), grouped by the capability in its profile that calls for them. Struck through: expected but not listed.

Catalog searchdev.ucp.shopping.catalog.search

search_catalog

Catalog lookupdev.ucp.shopping.catalog.lookup

lookup_catalogget_product

Cartdev.ucp.shopping.cart

create_cartget_cartupdate_cartcancel_cart

Checkoutdev.ucp.shopping.checkout

create_checkoutget_checkoutupdate_checkoutcomplete_checkoutcancel_checkout

Capabilities

5 declared, all at 2026-08-25

Cart shopping.cart

Checkout shopping.checkout

Fulfillmentextension shopping.fulfillment

Catalog Lookup shopping.catalog.lookup

Catalog Search shopping.catalog.search

UCP profile as served 2.5 KB · 66 lines

{
    "ucp": {
        "version": "2026-08-25",
        "business": {
            "url": "https://www.leontyna.cz",
            "name": "Leontyna.cz",
            "contact": "[email protected]",
            "supported_currencies": [
                "CZK",
                "EUR",
                "HUF",
                "PLN"
            ]
        },
        "services": {
            "dev.ucp.shopping": [
                {
                    "spec": "https://ucp.dev/2026-08-25/specification/overview",
                    "schema": "https://ucp.dev/2026-08-25/services/shopping/rest.openapi.json",
                    "version": "2026-08-25",
                    "endpoint": "https://www.leontyna.cz/ucp/v1",
                    "transport": "rest"
                }
            ]
        },
        "capabilities": {
            "dev.ucp.shopping.cart": [
                {
                    "spec": "https://ucp.dev/2026-08-25/specification/shopping/cart",
                    "schema": "https://ucp.dev/2026-08-25/schemas/shopping/cart.json",
                    "version": "2026-08-25"
                }
            ],
            "dev.ucp.shopping.checkout": [
                {
                    "spec": "https://ucp.dev/2026-08-25/specification/shopping/checkout",
                    "schema": "https://ucp.dev/2026-08-25/schemas/shopping/checkout.json",
                    "version": "2026-08-25"
                }
            ],
            "dev.ucp.shopping.fulfillment": [
                {
                    "spec": "https://ucp.dev/2026-08-25/specification/shopping/extensions/fulfillment",
                    "schema": "https://ucp.dev/2026-08-25/schemas/shopping/fulfillment.json",
                    "extends": "dev.ucp.shopping.checkout",
                    "version": "2026-08-25"
                }
            ],
            "dev.ucp.shopping.catalog.lookup": [
                {
                    "spec": "https://ucp.dev/2026-08-25/specification/shopping/catalog/lookup",
                    "schema": "https://ucp.dev/2026-08-25/schemas/shopping/catalog_lookup.json",
                    "version": "2026-08-25"
                }
            ],
            "dev.ucp.shopping.catalog.search": [
                {
                    "spec": "https://ucp.dev/2026-08-25/specification/shopping/catalog/search",
                    "schema": "https://ucp.dev/2026-08-25/schemas/shopping/catalog_search.json",
                    "version": "2026-08-25"
                }
            ]
        },
        "payment_handlers": []
    }
}

What goes in a UCP profile →Check your JSON in the Validator →Guides by store platform →

Is leontyna.cz your store?

Claim it with one DNS record.

Claim this store Send an agent to shop here ↗

Status badge

Markdown ·

[![UCP Status](https://ucpchecker.com/badge/leontyna.cz)](https://ucpchecker.com/status/leontyna.cz)

Questions

Can UCP agents buy from leontyna.cz?

Through its REST service, an agent can search the catalogue, build a cart and start a checkout. But the profile is only served after a redirect from leontyna.cz, and the spec forbids that, so an agent that follows the rules stops before it starts. This is what the store declares and what our check reached; an observed agent run shows how far an agent actually gets.

Is leontyna.cz ready for UCP agents?

leontyna.cz publishes a valid UCP profile and scores 88/100 (grade A). 4 things to fix: the profile sits behind a redirect, the profile has no ETag or Last-Modified header, publish the public keys agents use to check your messages and publish a /llms.txt brand brief.

What is a UCP profile?

The JSON file a store publishes at /.well-known/ucp to tell UCP agents which services it offers, how to call them and how it takes payment. The spec calls it the business profile. leontyna.cz's is 1.6 KB, written for UCP 2026-08-25. What goes in a UCP profile.

How was leontyna.cz checked?

With public requests on 25 Oct 2026: we read /.well-known/ucp and robots.txt, validated the profile against UCP 2026-08-25, checked that its spec and schema links resolve. No sign-in and no purchase. How we check.