Name: hunchbank.com WebMCP audit
Creator: ora

Tools

/

search_1

Search for content on this website. Search Acme StoreTakes an action on the site.

pagehttps://hunchbank.com/

implementation

viaimperative

entry pointnavigator

registered after913ms

executepresent

api surface

queryrequired

annotations

read onlyfalse

destructivenot declared

idempotentnot declared

open worldnot declared

untrusted contentnot declared

titlenot declared

2 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: [/* ... */] });

warningHuman parity

0 / 8

39 of 39 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_1, get_products, search_and_list, extract_page_listings, navigate_flight_search

fix

<!-- Give the tool a visible counterpart: a declarative form is one the person can see and use too. -->
<form toolname="search_1" tooldescription="...">
  <!-- the same action, as UI -->
</form>

tool json

{
  "name": "search_1",
  "description": "Search for content on this website. Search Acme Store",
  "inputSchema": {
    "type": "object",
    "properties": {
      "query": {
        "type": "string",
        "description": "Search query or keywords"
      }
    },
    "required": [
      "query"
    ]
  },
  "annotations": {
    "readOnlyHint": false
  }
}

Findings

WebMCP use

62 / 100 · weight 50

passTools registered

4 / 4

39 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 2021.8999998569489ms to register, past the 1000ms an agent reading the registry at first paint would wait for.

tooldownload

download: registered at 2021.8999998569489ms

fix

// Register tools as soon as they're ready, not behind a deferred/async chunk.
document.modelContext.provideContext({ tools: [/* ... */] });

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_1

fix

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

passSchema validity

5 / 5

All 39 tools declare a structurally valid object input schema.

passSchema quality

4 / 4

All 39 tool schemas describe their parameters and stay within Chrome's size guidance.

passStub detection

5 / 5

All 39 tools declare an execute handler.

passAnnotations present

4 / 4

All 39 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 (39 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

38 tool registrations threw during the capture, so the registry an agent reads is incomplete.

duplicate tool name registered: search_1

fix

try {
  document.modelContext.provideContext({ tools: [/* ... */] });
} catch (err) {
  console.error("WebMCP registration failed", err);
}

warningToolchange coherence

1 / 2

39 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

63 / 100 · weight 30

warningNaming quality

1.3 / 2

Tool naming makes selection harder than it needs to be: 3 names are over Chrome's 30-character guidance; 29 names do not start with a verb (extract_page_listings).

toolsignup_sign_me_up_for_a_free_trial

fix

{ name: "signup_sign_me_up_for_a_free_trial" /* 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.

not applicableCoverage vs. site type

0 / 8

This tool set does not place the site in a category with a known expected tool shape, so there is no coverage baseline to score it against.

Human experience

0 / 100 · weight 20

warningHuman parity

0 / 8

39 of 39 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_1

search_1, get_products, search_and_list, extract_page_listings, navigate_flight_search

fix

<!-- Give the tool a visible counterpart: a declarative form is one the person can see and use too. -->
<form toolname="search_1" 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: 39
run time: 8s
finished: Aug 28, 2026