attio.com WebMCP audit

Rescan
audited Aug 28, 2026in 5s
76/ 100

5 tools registered. Strongest in usefulness, weakest in WebMCP use.

WebMCP use60
Usefulness100
Human experience80
about:blank

No agent run recorded yet.

No steps recorded

Tools

/
view_pricing: fail

view_pricing

View Attio's pricing plans and compare features across tiers including Free, Plus, Pro, and Enterprise.Answers a question. Declared read only.
pagehttps://attio.com/
implementation
viaimperative
entry pointnavigator
registered after733ms
executepresent
api surfaceTakes no parameters.
annotations
read onlytrue
destructivenot declared
idempotentnot declared
open worldnot declared
untrusted contentnot declared
titlenot declared
3 findings
passRegistration timing
4 / 4
Every measured tool registered within 732.8999998569489ms of navigation. 4 further tools carried no measurable registration time.
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: [/* ... */] });
failSchema validity
0 / 5
1 of 1 tools declare an input schema an agent cannot read: view_pricing declares no input schema.
view_pricing: declares no input schema
fix
{
  name: "view_pricing",
  inputSchema: { type: "object", properties: { /* ... */ }, required: [] }
}
tool json
{
  "name": "view_pricing",
  "description": "View Attio's pricing plans and compare features across tiers including Free, Plus, Pro, and Enterprise.",
  "inputSchema": null,
  "annotations": {
    "readOnlyHint": true
  }
}
Showing view_pricing

Findings

WebMCP use

60 / 100 · weight 50
passTools registered
4 / 4
1 imperative tool and 4 declarative forms 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. The 4 declarative form tools on the page stay usable regardless.
passRegistration timing
4 / 4
Every measured tool registered within 732.8999998569489ms of navigation. 4 further tools carried no measurable registration time.
toolview_pricing
failCanonical entry point
0 / 4
Every tool registers through the deprecated navigator.modelContext alias; move them to document.modelContext before the alias is removed.
toolview_pricing
fix
// Use the canonical entry point - navigator.modelContext is deprecated.
document.modelContext.provideContext({ tools: [/* ... */] });
failSchema validity
0 / 5
1 of 1 tools declare an input schema an agent cannot read: view_pricing declares no input schema.
toolview_pricing
view_pricing: declares no input schema
fix
{
  name: "view_pricing",
  inputSchema: { type: "object", properties: { /* ... */ }, required: [] }
}
passSchema quality
4 / 4
All 5 tool schemas describe their parameters and stay within Chrome's size guidance.
passStub detection
5 / 5
The one registered tool declares an execute handler.
passAnnotations present
4 / 4
All 1 tool declares 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 (1 declared hint 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.
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 5 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

80 / 100 · weight 20
passHuman parity
6.4 / 8
Most tools have a visible counterpart: 4 declarative forms out of 5 tools.
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
5
run time
5s
finished
Aug 28, 2026