cocktail.glass WebMCP audit

Name: cocktail.glass WebMCP audit
Creator: ora

Rescan

audited Aug 28, 2026in 4s

49/ 100

7 tools registered. Strongest in WebMCP use, weakest in human experience.

WebMCP use63

Usefulness59

Human experience0

about:blank

No agent run recorded yet.

No steps recorded

Tools

search_cocktails

Search the cocktail catalogue by name (substring, case- and diacritic-insensitive, so "carre" matches "Carré"). Returns up to 25 summary results — name, page URL, family, glassware — ranked exact match first, then prefix, then suffix, then any substring. Use this when the user names a drink (even fuzzily) and you want to confirm it exists or disambiguate similar names; once you have a single name, call get_cocktail_recipe for the full recipe. For ingredient-based discovery use find_cocktails_by_ingredient instead.Answers a question. Declared read only.

pagehttps://cocktail.glass/

implementation

viaimperative

entry pointnavigator

registered after228ms

executepresent

api surface

queryrequired

annotations

read onlytrue

destructivenot declared

idempotentnot declared

open worldfalse

untrusted contentnot declared

titlenot declared

3 findings

failCanonical entry point

0 / 4

Every tool registers through the deprecated navigator.modelContext alias; move them to document.modelContext before the alias is removed.

fix

// Use the canonical entry point - navigator.modelContext is deprecated.
document.modelContext.provideContext({ tools: [/* ... */] });

warningSchema quality

0.6 / 4

6 of 7 tool schemas are harder for an agent to use than they need to be: search_cocktails description is 519 characters, over Chrome's 500-character guidance.

search_cocktails: description is 519 characters, over Chrome's 500-character guidance; list_cocktails: description is 543 characters, over Chrome's 500-character guidance; list_cocktails: 1 parameter

fix

{
  name: "search_cocktails",
  inputSchema: {
    type: "object",
    properties: {
      query: { type: "string", description: "What to search for" }
    },
    required: ["query"]
  }
}

warningHuman parity

0 / 8

7 of 7 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_cocktails, list_cocktails, get_cocktail_recipe, find_cocktails_by_ingredient, find_cocktails_in_movie

fix

<!-- Give the tool a visible counterpart: a declarative form is one the person can see and use too. -->
<form toolname="search_cocktails" tooldescription="...">
  <!-- the same action, as UI -->
</form>

tool json

{
  "name": "search_cocktails",
  "description": "Search the cocktail catalogue by name (substring, case- and diacritic-insensitive, so \"carre\" matches \"Carré\"). Returns up to 25 summary results — name, page URL, family, glassware — ranked exact match first, then prefix, then suffix, then any substring. Use this when the user names a drink (even fuzzily) and you want to confirm it exists or disambiguate similar names; once you have a single name, call get_cocktail_recipe for the full recipe. For ingredient-based discovery use find_cocktails_by_ingredient instead.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "query": {
        "type": "string",
        "minLength": 1,
        "description": "Cocktail name or part of one — a single drink name, not an ingredient or category.",
        "examples": [
          "Negroni",
          "margarita",
          "carre"
        ]
      }
    },
    "required": [
      "query"
    ]
  },
  "annotations": {
    "readOnlyHint": true,
    "openWorldHint": false
  }
}

Findings

WebMCP use

63 / 100 · weight 50

passTools registered

4 / 4

7 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.

passRegistration timing

4 / 4

Every measured tool registered within 228ms of navigation.

toolrandom_cocktail

failCanonical entry point

0 / 4

Every tool registers through the deprecated navigator.modelContext alias; move them to document.modelContext before the alias is removed.

toolsearch_cocktails

fix

// Use the canonical entry point - navigator.modelContext is deprecated.
document.modelContext.provideContext({ tools: [/* ... */] });

passSchema validity

5 / 5

All 7 tools declare a structurally valid object input schema.

warningSchema quality

0.6 / 4

6 of 7 tool schemas are harder for an agent to use than they need to be: search_cocktails description is 519 characters, over Chrome's 500-character guidance.

toolsearch_cocktails

search_cocktails: description is 519 characters, over Chrome's 500-character guidance; list_cocktails: description is 543 characters, over Chrome's 500-character guidance; list_cocktails: 1 parameter

fix

{
  name: "search_cocktails",
  inputSchema: {
    type: "object",
    properties: {
      query: { type: "string", description: "What to search for" }
    },
    required: ["query"]
  }
}

passStub detection

5 / 5

All 7 tools declare an execute handler.

passAnnotations present

4 / 4

All 7 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 (7 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.

passRegistration errors

2 / 2

No tool registration threw during the capture.

warningToolchange coherence

1 / 2

7 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

59 / 100 · weight 30

warningNaming quality

1.9 / 2

Tool naming makes selection harder than it needs to be: 1 name does not start with a verb (random_cocktail).

toolrandom_cocktail

fix

{ name: "random_cocktail" /* 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.

warningCoverage vs. site type

4 / 8

The tool set covers 2 of the 4 things an agent needs on a commerce site; it cannot add to or read the cart or start checkout or place an order.

Human experience

0 / 100 · weight 20

warningHuman parity

0 / 8

toolsearch_cocktails

search_cocktails, list_cocktails, get_cocktail_recipe, find_cocktails_by_ingredient, find_cocktails_in_movie

fix

<!-- Give the tool a visible counterpart: a declarative form is one the person can see and use too. -->
<form toolname="search_cocktails" 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: 7
run time: 4s
finished: Aug 28, 2026