Capture the target PC screen via HDMI capture device. Returns the image. Use sparingly as images consume many tokens.
AI agents call capture_screen to retrieve information from Mcp Serial Hid Kvm without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool reads/retrieves data (a screenshot) from the target PC without causing any side effects. However, severity is medium because screen captures can expose sensitive information (passwords, private data, confidential content) visible on the physical PC's display.
From the tool's definition Capture the target PC screen via HDMI capture device. Returns the image.
Attacks that exploit this kind of access
Capture the target PC screen via HDMI capture device. Returns the image. Use sparingly as images consume many tokens. It is categorised as a Read tool in the Mcp Serial Hid Kvm MCP Server, which means it retrieves data without modifying state.
Register the Mcp Serial Hid Kvm MCP server in PolicyLayer and add a rule for capture_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 Mcp Serial Hid Kvm. Nothing to install.
capture_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 capture_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 capture_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.
capture_screen is provided by the Mcp Serial Hid Kvm MCP server (sunasaji/mcp-serial-hid-kvm). 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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