screenshot_focus_selection

THE RISK

Low Risk

Why screenshot_focus_selection needs a policy

The tool only reads the current state of the editor by taking a screenshot. It adjusts the viewport focus (a non-destructive, reversible visual change) and captures an image. No data is created, modified, deleted, or executed.

From the tool's definition Focus viewport on selected actors and take a screenshot

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

POLICY

How to control screenshot_focus_selection

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

policy.json

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

screenshot_focus_selection 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 Uefn — 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

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All 143 Uefn 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 screenshot_focus_selection

What does the screenshot_focus_selection tool do? +

Focus viewport on selected actors and take a screenshot. It is categorised as a Read tool in the Uefn MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on screenshot_focus_selection? +

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

What risk level is screenshot_focus_selection? +

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

Can I rate-limit screenshot_focus_selection? +

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

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

screenshot_focus_selection is provided by the Uefn MCP server (quangdang46/uefn-verse-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Uefn tool call.

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

CHECK YOUR STACK →