Capture a screenshot
AI agents call vnc_screenshot to retrieve information from VNC MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Screenshot capture is a passive observation mechanism. While the VNC server overall provides Execute and Destructive capabilities (vnc_execute_sequence, vnc_key_tap can control systems), this specific tool only retrieves visual information from the remote display. It has no capability to modify state, execute code, delete data, or trigger financial transactions.
From the tool's definition Tool name 'vnc_screenshot' and description 'Capture a screenshot' indicate data retrieval with no side effects. Screenshots are read-only operations that observe screen state without modifying or executing anything.
Attacks that exploit this kind of access
Capture a screenshot. It is categorised as a Read tool in the VNC MCP Server MCP Server, which means it retrieves data without modifying state.
Register the VNC MCP Server MCP server in PolicyLayer and add a rule for vnc_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 VNC MCP Server. Nothing to install.
vnc_screenshot 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 vnc_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.
Set action: deny in the PolicyLayer policy for vnc_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.
vnc_screenshot is provided by the VNC MCP Server MCP server (volkan-m/vnc-mcp-server). 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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