match-day.nl WebMCP audit

Rescan
audited Aug 28, 2026in 5s
44/ 100

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

WebMCP use52
Usefulness60
Human experience0
about:blank

No agent run recorded yet.

No steps recorded

Tools

/nl
get_company_profile: fail

get_company_profile

Returns public entity facts for Match-Day, including positioning, location, contact details and core services.Takes an action on the site.
pagehttps://match-day.nl/nl
implementation
viaimperative
entry pointnavigator
registered after526ms
executepresent
api surfaceTakes no parameters.
annotations
read onlynot declared
destructivenot declared
idempotentnot declared
open worldnot declared
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: [/* ... */] });
failAnnotations present
0 / 4
4 of 4 tools declare no readOnlyHint, so an agent cannot tell a read from a write without guessing from the name.
get_company_profile, find_service_page, get_intake_links, get_knowledge_sources
fix
{
  name: "get_company_profile",
  annotations: { readOnlyHint: true, destructiveHint: false, idempotentHint: true }
}
warningHuman parity
0 / 8
4 of 4 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.
get_company_profile, find_service_page, get_intake_links, get_knowledge_sources
fix
<!-- Give the tool a visible counterpart: a declarative form is one the person can see and use too. -->
<form toolname="get_company_profile" tooldescription="...">
  <!-- the same action, as UI -->
</form>
tool json
{
  "name": "get_company_profile",
  "description": "Returns public entity facts for Match-Day, including positioning, location, contact details and core services.",
  "inputSchema": {
    "type": "object",
    "properties": {},
    "additionalProperties": false
  },
  "annotations": {}
}
Showing get_company_profile

Findings

WebMCP use

52 / 100 · weight 50
passTools registered
4 / 4
4 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 526.0999999046326ms of navigation.
toolget_intake_links
failCanonical entry point
0 / 4
Every tool registers through the deprecated navigator.modelContext alias; move them to document.modelContext before the alias is removed.
toolget_company_profile
fix
// Use the canonical entry point - navigator.modelContext is deprecated.
document.modelContext.provideContext({ tools: [/* ... */] });
passSchema validity
5 / 5
All 4 tools declare a structurally valid object input schema.
warningSchema quality
1 / 4
3 of 4 tool schemas are harder for an agent to use than they need to be: find_service_page 1 parameter has no description (language).
toolfind_service_page
find_service_page: 1 parameter has no description (language); get_intake_links: 2 parameters have no description (intent, language); get_knowledge_sources: 2 parameters have no description (topic, lan
fix
{
  name: "find_service_page",
  inputSchema: {
    type: "object",
    properties: {
      query: { type: "string", description: "What to search for" }
    },
    required: ["query"]
  }
}
passStub detection
5 / 5
All 4 tools declare an execute handler.
failAnnotations present
0 / 4
4 of 4 tools declare no readOnlyHint, so an agent cannot tell a read from a write without guessing from the name.
toolget_company_profile
get_company_profile, find_service_page, get_intake_links, get_knowledge_sources
fix
{
  name: "get_company_profile",
  annotations: { readOnlyHint: true, destructiveHint: false, idempotentHint: true }
}
not applicableAnnotation mismatch
0 / 3
No tool declares a readOnlyHint, so there is no safety claim to contradict.
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
4 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

60 / 100 · weight 30
passNaming quality
2 / 2
All 4 tool names are consistent, verb-led, and within Chrome's size guidance.
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 saas site; it cannot create a record or start a job or update or move an existing record.

Human experience

0 / 100 · weight 20
warningHuman parity
0 / 8
4 of 4 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.
toolget_company_profile
get_company_profile, find_service_page, get_intake_links, get_knowledge_sources
fix
<!-- Give the tool a visible counterpart: a declarative form is one the person can see and use too. -->
<form toolname="get_company_profile" 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
4
run time
5s
finished
Aug 28, 2026