cesium-browser-agent.pages.dev WebMCP audit

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audited Aug 28, 2026in 5s
68/ 100

61 tools registered. Strongest in WebMCP use, weakest in human experience.

WebMCP use86
Usefulness84
Human experience0
about:blank

No agent run recorded yet.

No steps recorded

Tools

/
flyTo: warning

flyTo

Animate the camera to a geographic location. Use for visible navigation requested by the user. Returns { success: boolean, message?: string, error?: string }.Takes an action on the site.
pagehttps://cesium-browser-agent.pages.dev/
implementation
viaimperative
entry pointdocument
registered after280ms
executepresent
api surface
longituderequired
latituderequired
heightoptional
headingoptional
pitchoptional
durationoptional
annotations
read onlyfalse
destructivenot declared
idempotentnot declared
open worldnot declared
untrusted contentnot declared
titlenot declared
4 findings
warningSchema quality
0.5 / 4
53 of 61 tool schemas are harder for an agent to use than they need to be: flyTo 3 parameters have no description (heading, pitch, duration).
flyTo: 3 parameters have no description (heading, pitch, duration); setView: 3 parameters have no description (heading, pitch, roll); zoomToExtent: 2 parameters have no description (bbox, duration); s
fix
{
  name: "flyTo",
  inputSchema: {
    type: "object",
    properties: {
      query: { type: "string", description: "What to search for" }
    },
    required: ["query"]
  }
}
warningNaming quality
1.7 / 2
Tool naming makes selection harder than it needs to be: 19 names do not start with a verb (flyTo).
fix
{ name: "flyto" /* short, unique, verb-based */ }
warningUntrusted content hint
0 / 2
2 of 2 tools look like they return text written by other people but declare no untrustedContentHint, so an agent will treat the response as the site speaking.
flyTo: message, user; setPostProcess: message, post
fix
{ name: "flyTo", annotations: { untrustedContentHint: true } }
warningHuman parity
0 / 8
61 of 61 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.
flyTo, setView, getView, zoomToExtent, saveViewpoint
fix
<!-- Give the tool a visible counterpart: a declarative form is one the person can see and use too. -->
<form toolname="flyto" tooldescription="...">
  <!-- the same action, as UI -->
</form>
tool json
{
  "name": "flyTo",
  "description": "Animate the camera to a geographic location. Use for visible navigation requested by the user. Returns { success: boolean, message?: string, error?: string }.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "longitude": {
        "type": "number",
        "minimum": -180,
        "maximum": 180,
        "description": "Longitude in decimal degrees"
      },
      "latitude": {
        "type": "number",
        "minimum": -90,
        "maximum": 90,
        "description": "Latitude in decimal degrees"
      },
      "height": {
        "type": "number",
        "minimum": 0,
        "maximum": 50000000,
        "description": "Height above the ellipsoid in meters",
        "default": 50000
      },
      "heading": {
        "type": "number",
        "minimum": 0,
        "maximum": 360,
        "default": 0
      },
      "pitch": {
        "type": "number",
        "minimum": -90,
        "maximum": 90,
        "default": -45
      },
      "duration": {
        "type": "number",
        "minimum": 0,
        "maximum": 60,
        "default": 2
      }
    },
    "required": [
      "longitude",
      "latitude"
    ],
    "additionalProperties": false
  },
  "annotations": {
    "readOnlyHint": false
  }
}
Showing flyTo

Findings

WebMCP use

86 / 100 · weight 50
passTools registered
4 / 4
61 tools registered across 1 page.
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 281.2999999523163ms of navigation.
toolplayTrajectory
passCanonical entry point
4 / 4
All 61 tools register on the canonical document.modelContext entry point.
passSchema validity
5 / 5
All 61 tools declare a structurally valid object input schema.
warningSchema quality
0.5 / 4
53 of 61 tool schemas are harder for an agent to use than they need to be: flyTo 3 parameters have no description (heading, pitch, duration).
toolflyTo
flyTo: 3 parameters have no description (heading, pitch, duration); setView: 3 parameters have no description (heading, pitch, roll); zoomToExtent: 2 parameters have no description (bbox, duration); s
fix
{
  name: "flyTo",
  inputSchema: {
    type: "object",
    properties: {
      query: { type: "string", description: "What to search for" }
    },
    required: ["query"]
  }
}
passStub detection
5 / 5
All 61 tools declare an execute handler.
passAnnotations present
4 / 4
All 61 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 (61 declared hints checked).
warningUntrusted content hint
0 / 2
2 of 2 tools look like they return text written by other people but declare no untrustedContentHint, so an agent will treat the response as the site speaking.
toolflyTo
flyTo: message, user; setPostProcess: message, post
fix
{ name: "flyTo", annotations: { untrustedContentHint: true } }
passRegistration errors
2 / 2
No tool registration threw during the capture.
warningToolchange coherence
1 / 2
61 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

84 / 100 · weight 30
warningNaming quality
1.7 / 2
Tool naming makes selection harder than it needs to be: 19 names do not start with a verb (flyTo).
toolflyTo
fix
{ name: "flyto" /* 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
61 of 61 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.
toolflyTo
flyTo, setView, getView, zoomToExtent, saveViewpoint
fix
<!-- Give the tool a visible counterpart: a declarative form is one the person can see and use too. -->
<form toolname="flyto" 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
61
run time
5s
finished
Aug 28, 2026