Capture the entire screen or a specific display
AI agents call screenshot_fullscreen to retrieve information from MCP Desktop Tools without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Screenshots are read-only operations that retrieve visual data from the screen without side effects. However, severity is elevated to medium because captured screenshots may contain sensitive information (passwords, PII, financial data, etc.) that an agent could exfiltrate, creating a privacy/confidentiality risk despite the tool itself being non-destructive and non-executing.
From the tool's definition Tool name 'screenshot_fullscreen' and description 'Capture the entire screen or a specific display' indicate data retrieval with no modification or execution of external operations.
Attacks that exploit this kind of access
Capture the entire screen or a specific display. It is categorised as a Read tool in the MCP Desktop Tools MCP Server, which means it retrieves data without modifying state.
Register the MCP Desktop Tools MCP server in PolicyLayer and add a rule for screenshot_fullscreen: 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 Desktop Tools. Nothing to install.
screenshot_fullscreen is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the screenshot_fullscreen 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.
Set action: deny in the PolicyLayer policy for screenshot_fullscreen. 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.
screenshot_fullscreen is provided by the MCP Desktop Tools MCP server (k1ta141k/mcp-desktop-tools). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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