ricmac.org WebMCP audit

Rescan
audited Aug 28, 2026in 5s
74/ 100

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

WebMCP use88
Usefulness100
Human experience0
about:blank

No agent run recorded yet.

No steps recorded

Tools

/
subscribe_newsletter: fail

subscribe_newsletter

Subscribe an email address to ricmac.org updates via the Jetpack email subscription form on the current page.Takes an action on the site.
pagehttps://ricmac.org/
implementation
viaimperative
entry pointdocument
registered after554ms
executepresent
api surface
emailrequired
annotations
read onlynot declared
destructivenot declared
idempotentnot declared
open worldnot declared
untrusted contentnot declared
titlenot declared
2 findings
failAnnotations present
0 / 4
2 of 2 tools declare no readOnlyHint, so an agent cannot tell a read from a write without guessing from the name.
subscribe_newsletter, find_in_article
fix
{
  name: "subscribe_newsletter",
  annotations: { readOnlyHint: true, destructiveHint: false, idempotentHint: true }
}
warningHuman parity
0 / 8
2 of 2 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.
subscribe_newsletter, find_in_article
fix
<!-- Give the tool a visible counterpart: a declarative form is one the person can see and use too. -->
<form toolname="subscribe_newsletter" tooldescription="...">
  <!-- the same action, as UI -->
</form>
tool json
{
  "name": "subscribe_newsletter",
  "description": "Subscribe an email address to ricmac.org updates via the Jetpack email subscription form on the current page.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "email": {
        "type": "string",
        "description": "Email address to subscribe"
      }
    },
    "required": [
      "email"
    ]
  },
  "annotations": {}
}
Showing subscribe_newsletter

Findings

WebMCP use

88 / 100 · weight 50
passTools registered
4 / 4
2 tools registered across 1 page. Capture caveat (not scored against the site): the page replaced modelContext on navigator, document, so imperative tools may be under-reported
passReal-browser eligible
8 / 8
A real browser exposes modelContext natively on this page, so the tools registered here are visible to an agent today.
passRegistration timing
4 / 4
Every measured tool registered within 554.5ms of navigation.
toolfind_in_article
passCanonical entry point
4 / 4
All 2 tools register on the canonical document.modelContext entry point.
passSchema validity
5 / 5
All 2 tools declare a structurally valid object input schema.
passSchema quality
4 / 4
All 2 tool schemas describe their parameters and stay within Chrome's size guidance.
passStub detection
5 / 5
All 2 tools declare an execute handler.
failAnnotations present
0 / 4
2 of 2 tools declare no readOnlyHint, so an agent cannot tell a read from a write without guessing from the name.
toolsubscribe_newsletter
subscribe_newsletter, find_in_article
fix
{
  name: "subscribe_newsletter",
  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. Capture caveat (not scored against the site): the page replaced modelContext on navigator, document, so imperative tools may be under-reported
warningToolchange coherence
1 / 2
2 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

100 / 100 · weight 30
passNaming quality
2 / 2
All 2 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.
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
2 of 2 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.
toolsubscribe_newsletter
subscribe_newsletter, find_in_article
fix
<!-- Give the tool a visible counterpart: a declarative form is one the person can see and use too. -->
<form toolname="subscribe_newsletter" 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
2
run time
5s
finished
Aug 28, 2026