ashwingopalsamy.in WebMCP audit

Name: ashwingopalsamy.in WebMCP audit
Creator: ora

Rescan

audited Aug 28, 2026in 4s

58/ 100

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

WebMCP use65

Usefulness83

Human experience0

about:blank

No agent run recorded yet.

No steps recorded

Tools

scan_images_c2pa

Scan every <img> on the current page for C2PA Content Credentials (content provenance metadata) and return a per-image summary: whether a manifest is present, the claim generator (the tool that produced or edited the image), the title, and the signer name. Use this to find which images on a page carry provenance data. Note: provenance is decoded but NOT cryptographically verified.Takes an action on the site.

pagehttps://ashwingopalsamy.in/

implementation

viaimperative

entry pointdocument

registered after170ms

executepresent

api surface

limitoptional

annotations

read onlynot declared

destructivenot declared

idempotentnot declared

open worldnot declared

untrusted contentnot declared

titlenot declared

3 findings

warningNaming quality

1.7 / 2

Tool naming makes selection harder than it needs to be: 2 names do not start with a verb (scan_images_c2pa).

fix

{ name: "scan_images_c2pa" /* short, unique, verb-based */ }

warningAnnotations present

2.7 / 4

2 of 6 tools declare no readOnlyHint, so an agent cannot tell a read from a write without guessing from the name.

scan_images_c2pa, inspect_image_c2pa

fix

{
  name: "scan_images_c2pa",
  annotations: { readOnlyHint: true, destructiveHint: false, idempotentHint: true }
}

warningHuman parity

0 / 8

6 of 6 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.

scan_images_c2pa, inspect_image_c2pa, search_site, get_profile, list_content

fix

<!-- Give the tool a visible counterpart: a declarative form is one the person can see and use too. -->
<form toolname="scan_images_c2pa" tooldescription="...">
  <!-- the same action, as UI -->
</form>

tool json

{
  "name": "scan_images_c2pa",
  "description": "Scan every <img> on the current page for C2PA Content Credentials (content provenance metadata) and return a per-image summary: whether a manifest is present, the claim generator (the tool that produced or edited the image), the title, and the signer name. Use this to find which images on a page carry provenance data. Note: provenance is decoded but NOT cryptographically verified.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "limit": {
        "type": "integer",
        "minimum": 1,
        "maximum": 100,
        "default": 25,
        "description": "Maximum number of images to fetch and scan (default 25, max 100)."
      }
    },
    "required": []
  },
  "annotations": {}
}

Findings

WebMCP use

65 / 100 · weight 50

passTools registered

4 / 4

6 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 235.90000009536743ms of navigation.

toollist_content

warningCanonical entry point

2 / 4

4 of 6 tools still register through the deprecated navigator.modelContext alias.

toolsearch_site

search_site, get_profile, list_content, get_note_markdown

fix

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

passSchema validity

5 / 5

All 6 tools declare a structurally valid object input schema.

warningSchema quality

2.7 / 4

2 of 6 tool schemas are harder for an agent to use than they need to be: search_site 1 parameter has no description (limit).

toolsearch_site

search_site: 1 parameter has no description (limit); list_content: 1 parameter has no description (limit)

fix

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

passStub detection

5 / 5

All 6 tools declare an execute handler.

warningAnnotations present

2.7 / 4

2 of 6 tools declare no readOnlyHint, so an agent cannot tell a read from a write without guessing from the name.

toolscan_images_c2pa

scan_images_c2pa, inspect_image_c2pa

fix

{
  name: "scan_images_c2pa",
  annotations: { readOnlyHint: true, destructiveHint: false, idempotentHint: true }
}

passAnnotation mismatch

3 / 3

No tool claims to be read-only while its name says it writes (4 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

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

duplicate tool name registered: search_site

fix

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

warningToolchange coherence

1 / 2

6 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

83 / 100 · weight 30

warningNaming quality

1.7 / 2

Tool naming makes selection harder than it needs to be: 2 names do not start with a verb (scan_images_c2pa).

toolscan_images_c2pa

fix

{ name: "scan_images_c2pa" /* 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

toolscan_images_c2pa

scan_images_c2pa, inspect_image_c2pa, search_site, get_profile, list_content

fix

<!-- Give the tool a visible counterpart: a declarative form is one the person can see and use too. -->
<form toolname="scan_images_c2pa" 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: 6
run time: 4s
finished: Aug 28, 2026