Find a template image on the screen
AI agents call vnc_find_image 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.
The tool performs image recognition and location detection, which is fundamentally a read operation that queries the current visual state. However, severity is elevated to 'medium' because in the context of the broader VNC server (which includes Execute and control capabilities), a successful image search could enable downstream misuse—such as locating and clicking on specific UI elements to trigger unintended…
From the tool's definition Tool name is 'vnc_find_image' and description states it will 'Find a template image on the screen' — this is a visual search/detection operation that retrieves information about screen content without modifying, executing code, or causing side effects.
Attacks that exploit this kind of access
Find a template image on the screen. 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_find_image: 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_find_image 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_find_image 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_find_image. 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_find_image 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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