screenshot

Take a screenshot of the current screen. Returns base64-encoded PNG. Works on macOS, Linux (with gnome-screenshot/scrot), and Windows.

SERVERYaver SOURCEyaver-cli

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/io-github-kivanccakmak-yaver/screenshot.md

WHAT IT DOES

What screenshot does on Yaver

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

RISK

Why screenshot is rated Low

This is a Read operation: it retrieves visual data from the display. Taking a screenshot has no side effects, does not execute arbitrary code, does not modify system state, and does not create financial obligations. While screenshots could theoretically expose sensitive information if misused in a broader context, the tool itself is purely informational/observational.

From the tool's definition The tool 'screenshot' performs a retrieval operation that 'takes a screenshot of the current screen' and 'returns base64-encoded PNG' — it captures and reads visual state without modifying, executing commands, or causing side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs screenshot safely

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

screenshot Allowed

screenshot 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": {
    "screenshot": {}
  }
}

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

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

FAQ

Questions about screenshot

What does the screenshot tool do? +

Take a screenshot of the current screen. Returns base64-encoded PNG. Works on macOS, Linux (with gnome-screenshot/scrot), and Windows. It is categorised as a Read tool in the Yaver MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on screenshot? +

Register the Yaver MCP server in PolicyLayer and add a rule for 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 Yaver. Nothing to install.

What risk level is screenshot? +

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

Can I rate-limit screenshot? +

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

Set action: deny in the PolicyLayer policy for 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 screenshot? +

screenshot is provided by the Yaver MCP server (yaver-cli). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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