spree.apparel.monster WebMCP audit

Rescan
audited Aug 28, 2026in 9s
62/ 100

16 tools registered. Strongest in usefulness, weakest in human experience.

WebMCP use64
Usefulness99
Human experience0
about:blank

No agent run recorded yet.

No steps recorded

Tools

/
search_products: warning

search_products

Search for apparel products by name, category (taxon permalink), price range, or stock status. Returns up to 20 results with name, price, and URL.Answers a question. Declared read only.
pagehttps://apparel.monster/
implementation
viaimperative
entry pointnavigator
registered after1646ms
executepresent
api surface
queryoptional
taxonoptional
min_priceoptional
max_priceoptional
in_stockoptional
sortoptional
limitoptional
annotations
read onlytrue
destructivenot declared
idempotentnot declared
open worldnot declared
untrusted contentnot declared
titlenot declared
4 findings
warningRegistration timing
2 / 4
The slowest tool took 1646.4000000953674ms to register, past the 1000ms an agent reading the registry at first paint would wait for.
search_products: registered at 1646.4000000953674ms
fix
// Register tools as soon as they're ready, not behind a deferred/async chunk.
document.modelContext.provideContext({ tools: [/* ... */] });
warningCanonical entry point
2 / 4
8 of 16 tools still register through the deprecated navigator.modelContext alias.
search_products, get_product, list_categories, view_cart, add_to_cart
fix
// Use the canonical entry point - navigator.modelContext is deprecated.
document.modelContext.provideContext({ tools: [/* ... */] });
warningSchema quality
3 / 4
4 of 16 tool schemas are harder for an agent to use than they need to be: search_products 1 parameter has no description (limit).
search_products: 1 parameter has no description (limit); list_categories: declares no required list, so an agent cannot tell which parameters are mandatory; add_to_cart: 1 parameter has no description
fix
{
  name: "search_products",
  inputSchema: {
    type: "object",
    properties: {
      query: { type: "string", description: "What to search for" }
    },
    required: ["query"]
  }
}
warningHuman parity
0 / 8
16 of 16 tools run through the JavaScript API with no visible counterpart, so the person co-browsing cannot see what the agent is offered. Declarative forms (or at least a title annotation) close the gap.
search_products, get_product, list_categories, view_cart, add_to_cart
fix
<!-- Give the tool a visible counterpart: a declarative form is one the person can see and use too. -->
<form toolname="search_products" tooldescription="...">
  <!-- the same action, as UI -->
</form>
tool json
{
  "name": "search_products",
  "description": "Search for apparel products by name, category (taxon permalink), price range, or stock status. Returns up to 20 results with name, price, and URL.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "query": {
        "type": "string",
        "description": "Keyword to match against product names, e.g. 'denim shirt'."
      },
      "taxon": {
        "type": "string",
        "description": "Permalink filter, e.g. 'categories/men/shirts' or 'collections/new-arrivals'."
      },
      "min_price": {
        "type": "number",
        "minimum": 0,
        "description": "Minimum price in USD."
      },
      "max_price": {
        "type": "number",
        "minimum": 0,
        "description": "Maximum price in USD."
      },
      "in_stock": {
        "type": "boolean",
        "description": "If true, only return purchasable items in stock.",
        "default": true
      },
      "sort": {
        "type": "string",
        "enum": [
          "popularity",
          "-popularity",
          "price",
          "-price",
          "name",
          "-name",
          "-available_on"
        ],
        "description": "Sort order.",
        "default": "-popularity"
      },
      "limit": {
        "type": "integer",
        "minimum": 1,
        "maximum": 20,
        "default": 10
      }
    }
  },
  "annotations": {
    "readOnlyHint": true
  }
}
Showing search_products

Findings

WebMCP use

64 / 100 · weight 50
passTools registered
4 / 4
16 tools registered across 1 page.
failReal-browser eligible
0 / 8
The page's code registers these tools, but a real visitor's browser does not get them yet: WebMCP needs a native modelContext or a current origin trial token, and this page has neither.
warningRegistration timing
2 / 4
The slowest tool took 1646.4000000953674ms to register, past the 1000ms an agent reading the registry at first paint would wait for.
toolsearch_products
search_products: registered at 1646.4000000953674ms
fix
// Register tools as soon as they're ready, not behind a deferred/async chunk.
document.modelContext.provideContext({ tools: [/* ... */] });
warningCanonical entry point
2 / 4
8 of 16 tools still register through the deprecated navigator.modelContext alias.
toolsearch_products
search_products, get_product, list_categories, view_cart, add_to_cart
fix
// Use the canonical entry point - navigator.modelContext is deprecated.
document.modelContext.provideContext({ tools: [/* ... */] });
passSchema validity
5 / 5
All 16 tools declare a structurally valid object input schema.
warningSchema quality
3 / 4
4 of 16 tool schemas are harder for an agent to use than they need to be: search_products 1 parameter has no description (limit).
toolsearch_products
search_products: 1 parameter has no description (limit); list_categories: declares no required list, so an agent cannot tell which parameters are mandatory; add_to_cart: 1 parameter has no description
fix
{
  name: "search_products",
  inputSchema: {
    type: "object",
    properties: {
      query: { type: "string", description: "What to search for" }
    },
    required: ["query"]
  }
}
passStub detection
5 / 5
All 16 tools declare an execute handler.
passAnnotations present
4 / 4
All 16 tools declare a readOnlyHint, so an agent knows which calls change state.
passAnnotation mismatch
3 / 3
No tool claims to be read-only while its name says it writes (16 declared hints checked).
not applicableUntrusted content hint
0 / 2
No tool's contract suggests it returns text written by somebody other than the site, so there is nothing to flag as untrusted.
failRegistration errors
0 / 2
8 tool registrations threw during the capture, so the registry an agent reads is incomplete.
duplicate tool name registered: search_products
fix
try {
  document.modelContext.provideContext({ tools: [/* ... */] });
} catch (err) {
  console.error("WebMCP registration failed", err);
}
warningToolchange coherence
1 / 2
16 tools were registered but the page never dispatched a toolchange event, so an agent subscribed to registry updates never learns they exist.
fix
document.modelContext.dispatchEvent(new Event("toolchange"));
not applicableInjection surface
0 / 3
The injection-surface model hop returned no usable result, so tool contracts were not reviewed for injection surface.

Usefulness

99 / 100 · weight 30
warningNaming quality
1.9 / 2
Tool naming makes selection harder than it needs to be: 2 names do not start with a verb (go_to_checkout).
toolgo_to_checkout
fix
{ name: "go_to_checkout" /* short, unique, verb-based */ }
not applicableDescription quality
0 / 6
The description-quality model hop returned no usable result, so descriptions were not rated.
not applicableTool selection
0 / 14
The tool-selection model hop returned no usable result.
passCoverage vs. site type
8 / 8
The tool set covers the whole core commerce flow: search or browse the catalog, read one item in detail, add to or read the cart, start checkout or place an order.

Human experience

0 / 100 · weight 20
warningHuman parity
0 / 8
16 of 16 tools run through the JavaScript API with no visible counterpart, so the person co-browsing cannot see what the agent is offered. Declarative forms (or at least a title annotation) close the gap.
toolsearch_products
search_products, get_product, list_categories, view_cart, add_to_cart
fix
<!-- Give the tool a visible counterpart: a declarative form is one the person can see and use too. -->
<form toolname="search_products" tooldescription="...">
  <!-- the same action, as UI -->
</form>
not applicablePage experience
0 / 12
The page-experience model hop returned no usable result, so the page was not graded.

Tool selection

The tool-selection model hop returned no usable result.
how this was captured
chrome
148.0.7778.96
capture shim
v1
spec snapshot
2026-08
mode
fast
pages
1
tools
16
run time
9s
finished
Aug 28, 2026