compare_viewports

A read tool on the UI Analyzer MCP server.

SERVERUI Analyzer MCP Server SOURCE0x-professor/uianalyzermcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade A, identity unverified Pull the record →

This record as markdown: /tools/0x-professor-uianalyzermcp/compare-viewports.md

WHAT IT DOES

What compare_viewports does on UI Analyzer MCP Server

AI agents call compare_viewports to retrieve information from UI Analyzer MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why compare_viewports is rated Low

This tool fits the Read category: it retrieves or compares UI state information without modifying, deleting, or executing external operations. The empty description lowers confidence slightly, but context from sibling tools and the server's stated purpose (analysis for AI coding assistants) strongly suggests it performs viewport comparison for inspection purposes only.

From the tool's definition Tool name 'compare_viewports' and server description indicate analysis/inspection capability. The server uses Playwright for analyzing website UIs and providing instructions.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs compare_viewports safely

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

compare_viewports Allowed

compare_viewports 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": {
    "compare_viewports": {}
  }
}

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

The button opens the PolicyLayer dashboard: create your workspace, connect UI Analyzer MCP Server, apply this rule, and every compare_viewports call is checked against it from then on.

FAQ

Questions about compare_viewports

What does the compare_viewports tool do? +

compare_viewports is a read tool on the UI Analyzer MCP Server MCP server. It is categorised as a Read tool in the UI Analyzer MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on compare_viewports? +

Register the UI Analyzer MCP Server MCP server in PolicyLayer and add a rule for compare_viewports: 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 UI Analyzer MCP Server. Nothing to install.

What risk level is compare_viewports? +

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

Can I rate-limit compare_viewports? +

Yes. Add a rate_limit block to the compare_viewports 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 compare_viewports completely? +

Set action: deny in the PolicyLayer policy for compare_viewports. 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 compare_viewports? +

compare_viewports is provided by the UI Analyzer MCP Server MCP server (0x-professor/uianalyzermcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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