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Browser[X]MCP

Browser[X]MCP

by rnd-pro
OverviewSchemaSourceRelated ServersDiscussionsAdmin
JavaScript
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list_navigation_elements

Enumerate all interactive elements on a page, with descriptions and optional grouping by purpose, type, or position to aid navigation and automation.

Instructions

Step 1: List all available interactive elements on the page with descriptions

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "list_navigation_elements"
  }
}

Input Schema

NameRequiredDescriptionDefault
urlNoURL to analyze (optional if page already loaded)
group_byNoHow to group the elementspurpose

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0-beta.1

TDQS

B3.1/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description must convey behavioral expectations. The verb 'List' suggests a read-only operation, but the description does not explicitly state that the page will not be modified, nor does it disclose potential side effects, whether a page must be loaded, or any other behavioral traits.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, direct sentence that immediately communicates the tool's purpose. There is no fluff or unnecessary detail, making it highly concise and front-loaded.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's simplicity (two optional parameters, no output schema), the short description is mostly sufficient. However, it omits details about the output format or what 'descriptions' entail, and the ambiguity about 'interactive elements' vs. 'navigation elements' leaves a gap in completeness.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema provides descriptions for both parameters (url and group_by), achieving 100% schema description coverage. The description itself adds no parameter-specific information, so it does not elevate beyond the baseline.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action ('List') and resource ('all available interactive elements on the page'), with a mention of 'descriptions' for output. However, the tool name is 'list_navigation_elements' while the description says 'interactive elements', which is a broader scope; this slight mismatch could confuse an agent about exactly what is listed.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No explicit when-to-use or alternative guidance is provided. The prefix 'Step 1' implies it is a preliminary action, but it does not explain under what circumstances to call this tool versus siblings like 'get_element_details' or 'extract_virtual_canvas'.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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