scrape · MCP-Crawl4AI MCP: Risk & Policy

WHAT IT DOES

What scrape does on MCP-Crawl4AI

AI agents invoke scrape to trigger actions in MCP-Crawl4AI. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why scrape needs a policy

Given the server context — headless Chromium, live web crawling, session-aware workflows — 'scrape' almost certainly triggers external browser-based operations against arbitrary URLs. This constitutes Execute category (external operations whose effects depend on arguments).

From the tool's definition Tool name 'scrape' on a server described as enabling AI systems to 'crawl and scrape the live web using Crawl4AI and headless Chromium'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

scrape Rate-limited

scrape 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.

View as policy code

policy.json

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

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches MCP-Crawl4AI, so you can run agents against it safely.

FAQ

Questions about scrape

What does the scrape tool do? +

scrape. It is categorised as a Execute tool in the MCP-Crawl4AI MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on scrape? +

Register the MCP-Crawl4AI MCP server in PolicyLayer and add a rule for scrape: 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 MCP-Crawl4AI. Nothing to install.

What risk level is scrape? +

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

Can I rate-limit scrape? +

Yes. Add a rate_limit block to the scrape 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 scrape completely? +

Set action: deny in the PolicyLayer policy for scrape. 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 scrape? +

scrape is provided by the MCP-Crawl4AI MCP server (wyattowalsh/mcp-crawl4ai). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.