Capture a screenshot of the current visible tab
AI agents call screenshot to retrieve information from Webclaw without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only captures and retrieves visual information from the current browser tab state. It does not modify, delete, execute code, or trigger external operations. It is purely observational, making it a Read category tool. Severity is low because screenshot capture poses minimal risk—it only reveals what is already visible to the user controlling the browser.
From the tool's definition Tool name 'screenshot' and description 'Capture a screenshot of the current visible tab' indicate data retrieval with no side effects.
Documented attack patterns abuse exactly the kind of access screenshot gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Webclaw, and nothing reaches the server without passing your rules. This is the rule we recommend for screenshot:
{
"version": "1",
"default": "deny",
"tools": {
"screenshot": {}
}
}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 a screenshot of the current visible tab. It is categorised as a Read tool in the Webclaw MCP Server, which means it retrieves data without modifying state.
Register the Webclaw MCP server in PolicyLayer and add a rule for 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 Webclaw. Nothing to install.
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 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 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.
screenshot is provided by the Webclaw MCP server (kuroko1t/webclaw). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Webclaw, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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21 Webclaw tools catalogued and risk-classified — across an index of 43,000+ MCP servers.