AI agents call is-device-locked to retrieve information from MCP Appium Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a simple status check on a mobile device. It reads information about the device's current lock state but does not create, modify, delete, or execute any operations. The blast radius of misuse is minimal—an AI agent could only obtain lock status information, which has no direct harmful consequences. This is a classic Read category tool.
From the tool's definition Tool name 'is-device-locked' and description 'Check if the device is currently locked' indicate a query operation that retrieves the device lock status without modifying any state or triggering side effects.
Documented attack patterns abuse exactly the kind of access is-device-locked gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Appium Server, and nothing reaches the server without passing your rules. This is the rule we recommend for is-device-locked:
{
"version": "1",
"default": "deny",
"tools": {
"is-device-locked": {}
}
}is-device-locked is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Check if the device is currently locked. It is categorised as a Read tool in the MCP Appium Server MCP Server, which means it retrieves data without modifying state.
Register the MCP Appium Server MCP server in PolicyLayer and add a rule for is-device-locked: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches MCP Appium Server. Nothing to install.
is-device-locked is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the is-device-locked rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for is-device-locked. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
is-device-locked is provided by the MCP Appium Server MCP server (rahulec08/appium-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 110 MCP Appium Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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110 MCP Appium Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.