extract_headings

THE RISK

Low Risk

Why extract_headings needs a policy

This tool queries and retrieves structural metadata (headings and hierarchy) from already-public web content. It performs pure data extraction with no side effects, making it a Read operation. The low severity reflects minimal blast radius—extracted heading structures cannot cause harm or unintended consequences even if misused by an agent.

From the tool's definition Tool name 'extract_headings' and description 'Extract document structure and heading hierarchy from web pages' indicate data retrieval with no modification, deletion, or execution of external operations.

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

POLICY

How to control extract_headings

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "extract_headings": {}
  }
}

extract_headings is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
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FAQ

Questions about extract_headings

What does the extract_headings tool do? +

Extract document structure and heading hierarchy from web pages. It is categorised as a Read tool in the MCP Web Scrape MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on extract_headings? +

Register the MCP Web Scrape MCP server in PolicyLayer and add a rule for extract_headings: 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 Web Scrape. Nothing to install.

What risk level is extract_headings? +

extract_headings is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit extract_headings? +

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

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

extract_headings is provided by the MCP Web Scrape MCP server (mukul975/mcp-web-scrape). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Web Scrape tool call.

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

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