AI agents call get_screen to retrieve information from Desk without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns system screen information (resolution, session type, display) without side effects. It is purely informational and does not interact with applications, modify state, or execute commands. This is a straightforward read operation with minimal security impact.
From the tool's definition Tool name 'get_screen' and description 'Return screen information: resolution, session type, display' indicate retrieval of display metadata with no modification or execution.
Attacks that exploit this kind of access
Return screen information: resolution, session type, display. It is categorised as a Read tool in the Desk MCP Server, which means it retrieves data without modifying state.
Register the Desk MCP server in PolicyLayer and add a rule for get_screen: 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 Desk. Nothing to install.
get_screen 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 get_screen 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 get_screen. 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.
get_screen is provided by the Desk MCP server (kpihx/desk-mcp). 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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