Capture screenshot with measurement rulers.
AI agents call capture_screenshot to retrieve information from Wayland without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Capturing a screenshot is a passive read operation that retrieves visual information from the display without side effects, modifications, or external command execution. While it could theoretically expose sensitive information on screen, the tool itself performs no destructive, financial, or execution-based actions.
From the tool's definition Tool name 'capture_screenshot' and description 'Capture screenshot with measurement rulers' indicate data retrieval only.
Documented attack patterns abuse exactly the kind of access capture_screenshot gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Wayland, and nothing reaches the server without passing your rules. This is the rule we recommend for capture_screenshot:
{
"version": "1",
"default": "deny",
"tools": {
"capture_screenshot": {}
}
}capture_screenshot is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Capture screenshot with measurement rulers. It is categorised as a Read tool in the Wayland MCP Server, which means it retrieves data without modifying state.
Register the Wayland MCP server in PolicyLayer and add a rule for capture_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 Wayland. Nothing to install.
capture_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 capture_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 capture_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.
capture_screenshot is provided by the Wayland MCP server (someaka/wayland-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Wayland, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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9 Wayland tools catalogued and risk-classified — across an index of 43,000+ MCP servers.