oxom.de WebMCP audit

Name: oxom.de WebMCP audit
Creator: ora

Rescan

audited Sep 2, 2026in 14s

69/ 100100% of the applicable check weight evaluated

5 tools registered. Strongest in task completion, weakest in trust.

Shared experience75

Task completion100

Tool quality87

Trust0

https://oxom.de

Tools

0 read, 0 write, 5 undeclared

Loading map

oxom_check_workspace_slug

Check whether a workspace slug is still available on oxom, before someone tries to sign up with it. Returns availability for the exact slug given.No behaviour hints declared. Agents should treat it as possibly state-changing.

pagehttps://oxom.de/

implementation

viaimperative

entry pointnavigator

registered after475ms

executepresent

api surface

slugrequired

annotations

read onlynot declared

untrusted contentnot declared

titlenot declared

2 findings

warningCanonical entry point

weight 3

Every tool registers through the deprecated navigator.modelContext alias; move them to document.modelContext before the alias is removed.

fix

// document.modelContext is the canonical entry point - the navigator.modelContext alias is deprecated.
document.modelContext.registerTool({ /* ... */ });

warningNaming quality

weight 2

Tool naming makes selection harder than it needs to be: 5 names do not start with a verb (oxom_check_workspace_slug).

fix

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

tool json

{
  "name": "oxom_check_workspace_slug",
  "description": "Check whether a workspace slug is still available on oxom, before someone tries to sign up with it. Returns availability for the exact slug given.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "slug": {
        "type": "string",
        "description": "The desired workspace slug, lowercase letters, digits and hyphens (for example 'easystretcher').",
        "pattern": "^[a-z0-9-]{1,64}$"
      }
    },
    "required": [
      "slug"
    ]
  },
  "annotations": {}
}

Findings

Shared experience

75 / 100 · weight 30

warningPage experience

weight 20

2 of 4 page-experience marks came back short: usable The page is mostly blank with only a header and a search bar visible..

usable: weak; clarity: weak

warningHuman parity

weight 10

The page the person sees came back short of the agent surface (2 of 4 page-experience marks came back short: usable The page is mostly blank with only a header and a search bar vis...), so the two are not sharing an equal experience.

fix

// Make the tool's effect visible on the page the person is looking at:
// update the same UI your existing human flow uses when your_tool_name runs,
// so the person co-browsing sees what the agent just did.
execute: async (args, { signal }) => {
  const result = await performAction(args, signal);
  renderResultInPage(result); // the human-visible half of the same action
  return result;
}

Task completion

100 / 100 · weight 25

passTool selection

weight 15

An agent chose an existing, callable tool and built a schema-valid call for all 1 canonical intents, each matching the kind of tool its intent needs. Nothing was executed, so this verifies selection, not outcomes.

not applicableCoverage vs. site type

weight 10

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.

Tool quality

87 / 100 · weight 25

passRegistration timing

weight 1

Every measured tool registered within 476ms of navigation.

tooloxom_agent_resources

warningCanonical entry point

weight 3

Every tool registers through the deprecated navigator.modelContext alias; move them to document.modelContext before the alias is removed.

tooloxom_check_workspace_slug

fix

// document.modelContext is the canonical entry point - the navigator.modelContext alias is deprecated.
document.modelContext.registerTool({ /* ... */ });

passSchema validity

weight 4

All 5 declared input schemas are structurally valid object schemas.

passSchema quality

weight 4

All 3 of 5 tool schemas that declare parameters describe them (the other 2 declare no parameters), and every description stays within Chrome's size guidance.

warningNaming quality

weight 2

Tool naming makes selection harder than it needs to be: 5 names do not start with a verb (oxom_check_workspace_slug).

tooloxom_check_workspace_slug

fix

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

passStub detection

weight 4

All 5 tools declare an execute handler.

passRegistration errors

weight 2

No tool registration threw during the capture.

passDescription quality

weight 5

All 5 rated tool descriptions say what the tool does, when to use it, and what it returns.

Trust

0 / 100 · weight 20

not applicableAnnotations present

weight 6

No tool name reads like a read, and an absent readOnlyHint already defaults to "this may write" - the one hint worth declaring here is readOnlyHint: true on read tools, and this set has none to declare it on.

not applicableAnnotation mismatch

weight 6

No tool declares a readOnlyHint, so there is no safety claim to contradict.

not applicableUntrusted content hint

weight 4

No tool's contract suggests it returns text written by somebody other than the site, so there is nothing to flag as untrusted.

warningInjection surface

weight 4

4 of 5 tools carry instruction-shaped text in their own metadata: oxom_get_pay_offer description instructs agent when to use tool.

tooloxom_get_pay_offer

oxom_get_pay_offer: description instructs agent when to use tool; oxom_navigate: description instructs agent when to use tool; oxom_when_to_use: description instructs agent how and when to use tool; oxom_agent_resources: description instructs agent when to use tool

fix

{
  name: "oxom_get_pay_offer",
  // Metadata DESCRIBES the tool - it never addresses the agent reading it.
  // Rewrite any name, description, title, or schema field description that
  // instructs the agent (which tool to prefer, what to output, rules to
  // ignore) so it states what the tool does and what it returns instead.
  description: "Searches the catalog and returns matching items with prices."
}

Tool selection

100% across 1 intents

I want to oxom check workspace slug on this site.ok

choseoxom_check_workspace_slugexpected oxom check workspace slugkind matched

arguments

{
  "slug": "easystretcher"
}

model: gemini-2.5-flash

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how this was captured

observed via: capture shim (Chromium 148.0.7778.96)
chrome: 148.0.7778.96
capture shim: v2
spec snapshot: 2026-08-26
mode: fast
pages: 1 - entry page only
tools: 5
run time: 14s
finished: Sep 2, 2026

Checked the way in-browser agents discover tools: the top-level document's modelContext registry, read after the page settles.