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mobile-simulator-emulator-mcp

mobile-simulator-emulator-mcp

by gitsoufiane
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Local

Set Mobile App Permission

mobile_set_permission
DestructiveIdempotent

Grant, revoke, or reset iOS Simulator privacy services and Android runtime permissions for apps on virtual devices.

Instructions

Grant, revoke, or reset an allowlisted iOS Simulator privacy service; grant or revoke a declared Android runtime permission.

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": {
      "device": "<device>",
      "appId": "<appId>",
      "permission": "<permission>",
      "action": "<action>"
    },
    "name": "mobile_set_permission"
  }
}

Input Schema

NameRequiredDescriptionDefault
appIdYes
actionYes
deviceYesStable device ID returned by mobile_list_devices
permissionYes

Output Schema

NameRequiredDescriptionDefault
appIdYes
actionYes
deviceYes
updatedYes
permissionYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.2.0

TDQS

B3.3/5.0
Behavior3/5

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

Description adds context about platform-specific behaviors (iOS Simulator allowlisted services vs. Android runtime permissions) beyond annotations. However, it doesn't disclose side effects, prerequisites (e.g., device booted, app installed), or error conditions. Annotations already indicate mutation and destructiveness.

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

Conciseness4/5

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

Single sentence is concise but slightly dense due to combining two platforms. Could be split for readability, but overall efficient.

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?

Despite having an output schema (not shown), the description misses important context like behavior when the app isn't installed or the device isn't booted. With 4 required parameters and low schema coverage, more guidance is needed for correct invocation.

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

Parameters4/5

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

Schema description coverage is low (25%), but the description explains the 'permission' parameter meaning (iOS vs. Android) and the 'action' parameter values (grant, revoke, reset). It adds significant value for these two parameters, though 'device' and 'appId' lack explanation.

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?

Description clearly states the tool grants, revokes, or resets mobile app permissions for both iOS Simulator and Android. It distinguishes itself from sibling tools like mobile_install_app or mobile_reset_app by focusing on permissions, but doesn't explicitly differentiate from potential sibling permission tools.

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 guidance provided on when to use this tool versus alternatives (e.g., mobile_reset_app for resetting app data). No preconditions or scenarios mentioned.

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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