html_to_screenshot

THE RISK

High Risk

Why html_to_screenshot needs a policy

This tool executes arbitrary HTML content in a headless browser environment. Running arbitrary HTML/JavaScript in a browser context constitutes code execution, as the HTML may contain scripts. The blast radius is medium because it runs in a sandboxed headless browser, but could be abused to execute malicious scripts or perform SSRF-like attacks via the rendering engine.

From the tool's definition Renders raw HTML string via headless browser and returns screenshot

Documented attack patterns abuse exactly the kind of access html_to_screenshot gives an agent:

POLICY

How to control html_to_screenshot

PolicyLayer is an MCP gateway — it sits between your AI agents and ReviewWebsite MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for html_to_screenshot:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "html_to_screenshot": {
      "limits": [
        {
          "counter": "html_to_screenshot_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

html_to_screenshot stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register ReviewWebsite MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

High-risk tools in ReviewWebsite MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about html_to_screenshot

What does the html_to_screenshot tool do? +

Convert HTML content to a screenshot image using ReviewWeb.site API. Renders raw HTML string via headless browser and returns screenshot as hosted URL or image data. It is categorised as a Execute tool in the ReviewWebsite MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on html_to_screenshot? +

Register the ReviewWebsite MCP Server MCP server in PolicyLayer and add a rule for html_to_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 ReviewWebsite MCP Server. Nothing to install.

What risk level is html_to_screenshot? +

html_to_screenshot is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit html_to_screenshot? +

Yes. Add a rate_limit block to the html_to_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.

How do I block html_to_screenshot completely? +

Set action: deny in the PolicyLayer policy for html_to_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.

What MCP server provides html_to_screenshot? +

html_to_screenshot is provided by the ReviewWebsite MCP Server MCP server (mrgoonie/reviewwebsite-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every ReviewWebsite MCP Server tool call.

Start from ReviewWebsite MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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