analyze_screenshot

THE RISK

Low Risk

Why analyze_screenshot needs a policy

This tool reads and analyzes an existing screenshot using a Vision Language Model. It only retrieves/processes visual data and produces an analysis — no side effects, no data modification, no execution of commands. The 'analyze' operation is purely a read/query action.

From the tool's definition Analyze screenshot using VLM

Documented attack patterns abuse exactly the kind of access analyze_screenshot gives an agent:

POLICY

How to control analyze_screenshot

PolicyLayer is an MCP gateway — it sits between your AI agents and Wayland, and nothing reaches the server without passing your rules. This is the rule we recommend for analyze_screenshot:

policy.json

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

analyze_screenshot is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Wayland — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Wayland tools

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All 9 Wayland tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about analyze_screenshot

What does the analyze_screenshot tool do? +

Analyze screenshot using VLM. It is categorised as a Read tool in the Wayland MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on analyze_screenshot? +

Register the Wayland MCP server in PolicyLayer and add a rule for analyze_screenshot: 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 Wayland. Nothing to install.

What risk level is analyze_screenshot? +

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

Can I rate-limit analyze_screenshot? +

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

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

analyze_screenshot is provided by the Wayland MCP server (someaka/wayland-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Wayland tool call.

Start from Wayland, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →