# UCP Checker (remote · ucpchecker.com)

Check any domain for UCP support and resolve verified UCP storefronts. Read-only, keyless.

- Trust score: 76/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-25

## Components

- remote · `ucpchecker.com`: 76/100 (this document), [markdown](https://verifymcp.io/servers/com-ucpchecker-ucp-checker/ucpchecker.md), [page](https://verifymcp.io/servers/com-ucpchecker-ucp-checker/ucpchecker)

## Channel facts

- Endpoint: `https://ucpchecker.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `2.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-09-25.

- **Endpoint Security**: 57/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 8 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 77/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 2417 tokens (~302/item across 8 items; 8 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 80/100
  - Stability check failed: schema churn in the 30 days we've observed: 2 tool removals, 0 breaking changes, 0 auth/transport breaks, 0 additions.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 8 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 9 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the UCP Checker MCP server?

UCP Checker is a hosted endpoint at https://ucpchecker.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http com-ucpchecker-ucp-checker 'https://ucpchecker.com/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "com-ucpchecker-ucp-checker": {
      "url": "https://ucpchecker.com/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "com-ucpchecker-ucp-checker": {
      "type": "http",
      "url": "https://ucpchecker.com/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.com-ucpchecker-ucp-checker]
url = "https://ucpchecker.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-ucpchecker-ucp-checker": {
      "type": "remote",
      "url": "https://ucpchecker.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-ucpchecker-ucp-checker --url 'https://ucpchecker.com/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-ucpchecker-ucp-checker:
    url: "https://ucpchecker.com/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "com-ucpchecker-ucp-checker": {
      "Transport": "http",
      "Url": "https://ucpchecker.com/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add com-ucpchecker-ucp-checker -t streamable-http -u 'https://ucpchecker.com/mcp'
```

### Other

```json
{
  "mcpServers": {
    "com-ucpchecker-ucp-checker": {
      "type": "http",
      "url": "https://ucpchecker.com/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-09-25 (score 76, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-09-24 (score 76, +1)

No change was recorded against any check on this day. Stability & Change Management went from 77 to 80.

### 2026-09-22 (score 75, +1)

No change was recorded against any check on this day. Stability & Change Management went from 70 to 73.

### 2026-09-20 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 63 to 67.

### 2026-09-17 (score 73, +1)

No change was recorded against any check on this day. Stability & Change Management went from 53 to 57.

### 2026-09-16 (score 72, 0)

- [functional regression] Schema quality: 274 → 302
- [functional regression] Resource “verified-stores” was removed

### 2026-09-15 (score 72, +1)

- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “search-all” rewrote its description, which is the text the model reads

### 2026-09-14 (score 71, 0)

- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “list-categories” rewrote its description, which is the text the model reads
- [security] Tool “search-all” rewrote its description, which is the text the model reads
- [security] Tool “check-domain” rewrote its description, which is the text the model reads
- [security] Tool “list-stores” rewrote its description, which is the text the model reads
- [functional regression] Schema quality: 216 → 265
- [functional regression] Schema quality: 216 → 256
- [cosmetic] “list-stores” added an optional parameter “platform”
- [cosmetic] “list-stores” reworded the description of “category”
- [cosmetic] “search-all” reworded the description of “category”
- [cosmetic] “list-stores” dropped the optional parameter “min_score”

## MCP tools (8)

### `list-stores` (~302 tokens)

List Stores

List verified UCP storefronts across every platform, best-evidenced first.

    Use when the user wants to browse stores — e.g., "what stores can I shop
    at?" or "show me Wix stores". To find stores that sell something, prefer
    search-all.

    Each store carries what we have actually observed about it, not what it claims:

    - `transactable` — declares checkout and we have read its catalogue
    - `catalogued` — we have read its catalogue
    - `resolvable` — its endpoint resolves, we have not probed it yet
    - `declared` — a valid manifest, nothing observed beyond it

    Filter by `platform` (shopify, wix, woocommerce, bigcommerce, shopware…).
    `category` narrows to the smaller set of deeply audited stores (see
    list-categories), so leave it out unless the user asks for a category.
    Developer previews and staging hosts are not listed.

Input parameters:

- `category` (string): Optional. Limit to the deeply audited stores in one category (e.g., "footwear"); see list-categories. Most browsing is better without it.
- `limit` (integer): Maximum number of stores to return (default: 10, max: 50)
- `platform` (string): Restrict to one platform, e.g. "wix", "shopify", "woocommerce".

### `list-categories` (~68 tokens)

List Categories

List store categories with store counts.

    Categories exist only for the deeply audited subset of verified stores,
    so this is a way to browse, not the whole index: list-stores and
    search-all cover every verified storefront. Sorted by number of stores
    (most first).

### `check-domain` (~244 tokens)

Check Domain

Check if a domain supports Universal Commerce Protocol (UCP).

    Returns the UCP status, manifest version, capabilities, response latency,
    and AI bot access policies (GPTBot, ClaudeBot, Google-Extended, etc.).

    If the store's edge rate-limits the live attempt, the result says so and
    reports the last OBSERVED state and when it was observed — an unobserved
    attempt is never presented as a verdict about the store.

    The domain is automatically normalized (removes protocol, www, paths).
    Examples: "shopify.com", "https://www.example.com/path" → "example.com"

    A negative result is information, not permission. It reports what UCP
    Checker has observed — it does not say a store cannot be used, and it is
    not a reason to stop. If a store matters to your task, try discover-store
    or connect to it directly regardless of what this returns.

Input parameters:

- `domain` (string, required): The domain to check for UCP support (e.g., "shopify.com", "example.com"). Protocol, www prefix, and paths are automatically removed.

### `discover-store` (~88 tokens)

Discover Store

Discover available shopping tools on a UCP-enabled store.

    Connects to the store's MCP endpoint and lists all available
    tools (search, cart, shipping, etc.). Use this to understand
    what a store supports before shopping.

    Example: domain: "allbirds.com"

Input parameters:

- `domain` (string, required): The store domain to discover (e.g., "allbirds.com")

### `search-catalog` (~177 tokens)

Search Catalog

Search for products on any UCP-enabled Shopify store.

    Searches the store's live product catalog via UCP/MCP and returns
    matching products with titles, prices, variants, and images.

    Examples:
    - domain: "allbirds.com", query: "tree topper"
    - domain: "gymshark.com", query: "hoodie"

Input parameters:

- `country` (string): ISO country code for localized pricing/inventory (e.g., "US", "GB", "CA"). Optional — defaults to store default.
- `domain` (string, required): The store domain (e.g., "allbirds.com", "gymshark.com"). Must be a UCP-enabled Shopify store.
- `query` (string, required): Product search term (e.g., "tree topper", "wool runners", "hoodie")

### `search-all` (~282 tokens)

Search All

Search for products across verified UCP stores at once.

    Fans the query out, concurrently, to the stores whose observed catalogue
    best matches it, and returns results grouped by store with each store's
    UCP score and evidence. Rare query words count for more than common ones.
    If no store's catalogue matches well enough, it searches no one and says
    "No strong match", naming the words no store carries and the closest weak
    matches, so you can go to a store you know instead of rewording. Slow or
    failing stores are skipped.

    `category` narrows the fan-out to the smaller set of deeply audited
    stores; leave it out for most queries.

    Example: query: "mattress topper", maxStores: 5

Input parameters:

- `category` (string): Optional. Limit the fan-out to the deeply audited stores in one category (e.g., "footwear"); see list-categories. Most queries search better without it.
- `country` (string): ISO country code for localized pricing (e.g., "US", "GB"). Optional.
- `maxStores` (integer): Maximum number of stores to search (default: 5, max: 10)
- `query` (string, required): Product search term (e.g., "running shoes", "hoodie")

### `search-policies` (~153 tokens)

Search Policies

Search store policies on any UCP-enabled Shopify store.

    Query return policies, shipping policies, refund policies, privacy policies,
    terms of service, or any other store policy. Returns the matching policy text.

    Use this when a user asks about a store's policies before or after purchase —
    e.g., "what is the return policy?", "do they offer free shipping?", "refund window?"

    Example: domain: "allbirds.com", query: "return policy"

Input parameters:

- `domain` (string, required): The store domain (e.g., "allbirds.com")
- `query` (string, required): Policy search term (e.g., "return policy", "shipping", "refund window", "privacy policy")

### `get-product-details` (~129 tokens)

Get Product Details

Get full product details including variant IDs from a UCP-enabled store.

    Use after search-catalog to see a product's full declared detail, including its variants.
    Pass the Product ID from search results to get all variants with their IDs.

    Example: domain: "allbirds.com", productId: "gid://shopify/Product/123456"

Input parameters:

- `domain` (string, required): The store domain (e.g., "allbirds.com")
- `productId` (string, required): The product ID from search-catalog results (e.g., "gid://shopify/Product/123456")

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-ucpchecker-ucp-checker/ucpchecker#diagnostics

## Score history

- 2026-09-25: 76
- 2026-09-24: 76
- 2026-09-23: 75
- 2026-09-22: 75
- 2026-09-21: 74
- 2026-09-20: 74
- 2026-09-19: 73
- 2026-09-18: 73
- 2026-09-17: 73
- 2026-09-16: 72
- 2026-09-15: 72
- 2026-09-14: 71
- 2026-09-13: 71
- 2026-09-12: 71
- 2026-09-11: 70
- 2026-09-10: 70
- 2026-09-09: 69
- 2026-09-08: 69
- 2026-09-07: 68
- 2026-09-06: 68
- 2026-09-05: 67
- 2026-09-04: 67
- 2026-09-03: 66
- 2026-09-02: 66
- 2026-09-01: 68
- 2026-08-31: 68
- 2026-08-30: 67
- 2026-08-29: 67
- 2026-08-28: 66
- 2026-08-27: 66

## Common questions

### What is the UCP Checker MCP server?

UCP Checker is an MCP server listed in the public MCP registry as com.ucpchecker/ucp-checker. Check any domain for UCP support and resolve verified UCP storefronts. Read-only, keyless. This page covers its hosted endpoint (https://ucpchecker.com/mcp).

### Is the UCP Checker MCP server safe to use?

UCP Checker scores 76 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the UCP Checker MCP server expose?

UCP Checker exposes 8 tools: list-stores, list-categories, check-domain, discover-store, search-catalog, and 3 more. Their descriptions and schemas cost roughly 1,443 tokens of context every time the server is loaded.

### Does the UCP Checker MCP server require authentication?

No. We connected to UCP Checker without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the UCP Checker MCP server still maintained?

UCP Checker is still listed as active in the MCP registry. We last reached this channel on 25 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://ucpchecker.com/mcp
- Website: https://ucpchecker.com/agents
- Changelog RSS feed: https://verifymcp.io/servers/com-ucpchecker-ucp-checker/ucpchecker.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-ucpchecker-ucp-checker/ucpchecker.json
- HTML version of this page: https://verifymcp.io/servers/com-ucpchecker-ucp-checker/ucpchecker