Capture a screenshot of a specific DOM element matched by a CSS selector. Use this when a full-page screenshot would send unnecessary pixels.
AI agents call capture_selector to retrieve information from Screenshot Website Fast without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool reads/captures visual data from a web page element without modifying any data or triggering side effects. It is a read-only operation that retrieves a rendered image of a DOM element.
From the tool's definition Capture a screenshot of a specific DOM element matched by a CSS selector
Documented attack patterns abuse exactly the kind of access capture_selector gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Screenshot Website Fast, and nothing reaches the server without passing your rules. This is the rule we recommend for capture_selector:
{
"version": "1",
"default": "deny",
"tools": {
"capture_selector": {}
}
}capture_selector is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Capture a screenshot of a specific DOM element matched by a CSS selector. Use this when a full-page screenshot would send unnecessary pixels. It is categorised as a Read tool in the Screenshot Website Fast MCP Server, which means it retrieves data without modifying state.
Register the Screenshot Website Fast MCP server in PolicyLayer and add a rule for capture_selector: 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 Screenshot Website Fast. Nothing to install.
capture_selector 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_selector 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_selector. 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_selector is provided by the Screenshot Website Fast MCP server (just-every/mcp-screenshot-website-fast). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Screenshot Website Fast, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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4 Screenshot Website Fast tools catalogued and risk-classified — across an index of 43,000+ MCP servers.