screen_size

Primary screen size plus the whole virtual desktop (multi-monitor) size. Read-only.

SERVERMcp Hands SOURCEhuocai250/mcp-hands

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/mcp-hands/screen-size.md

WHAT IT DOES

What screen_size does on Mcp Hands

AI agents call screen_size to retrieve information from Mcp Hands without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why screen_size is rated Low

Even though screen_size only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs screen_size safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Mcp Hands, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For screen_size, this is the rule to start with:

screen_size Allowed

screen_size is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "screen_size": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Mcp Hands, apply this rule, and every screen_size call is checked against it from then on.

FAQ

Questions about screen_size

What does the screen_size tool do? +

Primary screen size plus the whole virtual desktop (multi-monitor) size. Read-only. It is categorised as a Read tool in the Mcp Hands MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on screen_size? +

Register the Mcp Hands MCP server in PolicyLayer and add a rule for screen_size: 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 Hands. Nothing to install.

What risk level is screen_size? +

screen_size is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit screen_size? +

Yes. Add a rate_limit block to the screen_size 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.

How do I block screen_size completely? +

Set action: deny in the PolicyLayer policy for screen_size. 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.

What MCP server provides screen_size? +

screen_size is provided by the Mcp Hands MCP server (huocai250/mcp-hands). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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