agent-to-agent-commerce.de WebMCP audit

Rescan
audited Aug 28, 2026in 5s
65/ 100

One tool registered. Strongest in usefulness, weakest in human experience.

WebMCP use69
Usefulness100
Human experience0
about:blank

No agent run recorded yet.

No steps recorded

Tools

/
search_agentic_commerce: fail

search_agentic_commerce

Search deterministic Agent-to-Agent Commerce knowledge and canonical source pages. Returns matching pages with title, URL and summary. Read-only, no side effects.Takes an action on the site.
pagehttps://www.agent-to-agent-commerce.de/
implementation
viaimperative
entry pointdocument
registered after561ms
executepresent
api surface
queryrequired
annotations
read onlynot declared
destructivenot declared
idempotentnot declared
open worldnot declared
untrusted contentnot declared
titlenot declared
3 findings
passRegistration timing
4 / 4
Every measured tool registered within 561.4000000953674ms of navigation.
failAnnotations present
0 / 4
1 of 1 tools declare no readOnlyHint, so an agent cannot tell a read from a write without guessing from the name.
search_agentic_commerce
fix
{
  name: "search_agentic_commerce",
  annotations: { readOnlyHint: true, destructiveHint: false, idempotentHint: true }
}
warningHuman parity
0 / 8
1 of 1 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_agentic_commerce
fix
<!-- Give the tool a visible counterpart: a declarative form is one the person can see and use too. -->
<form toolname="search_agentic_commerce" tooldescription="...">
  <!-- the same action, as UI -->
</form>
tool json
{
  "name": "search_agentic_commerce",
  "description": "Search deterministic Agent-to-Agent Commerce knowledge and canonical source pages. Returns matching pages with title, URL and summary. Read-only, no side effects.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "query": {
        "type": "string",
        "description": "Agentic Commerce question or topic"
      }
    },
    "required": [
      "query"
    ]
  },
  "annotations": {}
}
Showing search_agentic_commerce

Findings

WebMCP use

69 / 100 · weight 50
passTools registered
4 / 4
1 tool 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 561.4000000953674ms of navigation.
toolsearch_agentic_commerce
passCanonical entry point
4 / 4
The one registered tool registers on the canonical document.modelContext entry point.
passSchema validity
5 / 5
All 1 tool declare a structurally valid object input schema.
passSchema quality
4 / 4
All 1 tool schema describe their parameters and stay within Chrome's size guidance.
passStub detection
5 / 5
The one registered tool declares an execute handler.
failAnnotations present
0 / 4
1 of 1 tools declare no readOnlyHint, so an agent cannot tell a read from a write without guessing from the name.
toolsearch_agentic_commerce
search_agentic_commerce
fix
{
  name: "search_agentic_commerce",
  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
1 tool was 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 1 tool name is 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
1 of 1 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_agentic_commerce
search_agentic_commerce
fix
<!-- Give the tool a visible counterpart: a declarative form is one the person can see and use too. -->
<form toolname="search_agentic_commerce" 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
1
run time
5s
finished
Aug 28, 2026