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pony-browser-mcp

pony-browser-mcp

by pssrh
OverviewSchemaSourceRelated ServersDiscussionsAdmin
JavaScript
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browser_hover

Hover over an element using CSS or text selectors to trigger tooltips, dropdowns, or hover states, with an optional hold duration.

Instructions

Hover over an element to trigger tooltips, dropdown menus, or hover states. Supports CSS and text selectors.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "selector": "<selector>"
    },
    "name": "browser_hover"
  }
}

Input Schema

NameRequiredDescriptionDefault
durationNoHow long to hold hover in ms (default: 500)
selectorYesCSS or text selector to hover over

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.1

TDQS

A4/5.0
Behavior3/5

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

No annotations are provided, so the description carries the behavioral disclosure burden. It does explain the visible effect of hovering and mentions selector support, but it does not disclose what happens if the selector matches nothing, whether the element is scrolled into view, or what the tool returns. These are notable gaps, though the core behavior is clear.

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?

Two concise sentences deliver the action, purpose, and selector support without unnecessary detail. The primary verb and intended use are front-loaded, making it easy for an agent to scan and understand.

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

Completeness4/5

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

For a simple two-parameter tool with no output schema, the description combined with the schema is largely sufficient. It explains what the tool does and what the elements are, though a bit more detail about error behavior or post-hover state would make it fully complete.

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 schema already documents both parameters with 100% coverage: `selector` as 'CSS or text selector' and `duration` as 'How long to hold hover in ms'. The description mostly restates the selector information already present, and it adds no additional nuance about the duration parameter or how selectors are resolved beyond what the schema provides.

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

Purpose5/5

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

The description uses a specific verb ('Hover') with a clear resource ('an element') and states the intended outcomes (`trigger tooltips, dropdown menus, or hover states`). This clearly differentiates it from sibling tools like browser_click, browser_double_click, and browser_right_click, which involve active input rather than hovering.

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

Usage Guidelines4/5

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

The phrase 'to trigger tooltips, dropdown menus, or hover states' gives clear contextual guidance for when this tool should be used. It does not explicitly mention when not to use it or name alternative tools, but the hover-specific purpose is sufficient to guide selection among the browser interaction siblings.

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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