List available monitors.
AI agents call list_monitors to retrieve information from Screen MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool simply enumerates available monitors on the system. It has no side effects, does not execute code or commands, does not modify state, and does not access sensitive data beyond basic display configuration metadata. The blast radius of misuse is minimal—an AI agent cannot cause harm by querying monitor availability.
From the tool's definition Tool name 'list_monitors' and description 'List available monitors' indicate a query operation that retrieves system display information without modifying, executing, or deleting anything.
Attacks that exploit this kind of access
List available monitors. It is categorised as a Read tool in the Screen MCP MCP Server, which means it retrieves data without modifying state.
Register the Screen MCP server in PolicyLayer and add a rule for list_monitors: 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 Screen MCP. Nothing to install.
list_monitors 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 list_monitors 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 list_monitors. 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.
list_monitors is provided by the Screen MCP server (jeandelest/screen-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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