web_scrape · MCPServe MCP: Risk & Policy

WHAT IT DOES

What web_scrape does on MCPServe

AI agents invoke web_scrape to trigger actions in MCPServe. 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 web_scrape needs a policy

Web scraping executes external operations (HTTP requests, HTML parsing) whose effects are argument-dependent and can impact remote systems (bandwidth, rate limiting, legal/policy violations). This exceeds Read (passive query) and qualifies as Execute. Severity is high because scraping can be used to extract sensitive data, violate terms of service, or cause denial-of-service conditions on target systems.

From the tool's definition Tool name 'web_scrape' combined with description 'Scrape a web page' indicates execution of web scraping operations, which require running code or triggering external HTTP requests whose side effects depend on the target URL argument.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

web_scrape Rate-limited

web_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": {
    "web_scrape": {
      "limits": [
        {
          "counter": "web_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 MCPServe, so you can run agents against it safely.

FAQ

Questions about web_scrape

What does the web_scrape tool do? +

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

How do I enforce a policy on web_scrape? +

Register the MCPServe MCP server in PolicyLayer and add a rule for web_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 MCPServe. Nothing to install.

What risk level is web_scrape? +

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

Can I rate-limit web_scrape? +

Yes. Add a rate_limit block to the web_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 web_scrape completely? +

Set action: deny in the PolicyLayer policy for web_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 web_scrape? +

web_scrape is provided by the MCPServe MCP server (mifunedev/mcp-sse). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.