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by zillow
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript

pressButton

Press hardware buttons on mobile devices to automate testing and control functions. Supports Android and iOS platforms for reliable device interaction.

Instructions

Press a hardware button on the device

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": {
      "button": "<button>",
      "platform": "<platform>"
    },
    "name": "pressButton"
  }
}

Input Schema

NameRequiredDescriptionDefault
buttonYesThe button to press
platformYesPlatform of the device

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

C2.9/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It states the action ('press') but doesn't explain what happens after pressing (e.g., device response, side effects, or error conditions). For a hardware interaction tool with zero annotation coverage, this leaves significant gaps in understanding its behavior.

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 with zero waste—it efficiently conveys the core action without unnecessary details. It's appropriately sized and front-loaded, making it easy to parse quickly.

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

Completeness2/5

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

Given the complexity of a hardware interaction tool with no annotations and no output schema, the description is insufficient. It lacks details on behavioral outcomes, error handling, or dependencies, leaving the agent with incomplete context for safe and effective use.

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?

Schema description coverage is 100%, with both parameters ('button' and 'platform') fully documented in the schema. The description doesn't add any meaning beyond what the schema provides, such as explaining button effects or platform-specific nuances. The baseline score of 3 reflects adequate but minimal value addition.

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 ('press') and resource ('hardware button on the device'), making the tool's function immediately understandable. However, it doesn't distinguish this from sibling tools like 'pressKey' or 'tapOn', which might have overlapping functionality, so it doesn't reach the highest score.

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?

The description provides no guidance on when to use this tool versus alternatives like 'pressKey' or 'tapOn'. There's no mention of prerequisites, such as device state or dependencies, or explicit exclusions for when other tools might be more appropriate.

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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