extract_text_only

THE RISK

Low Risk

Why extract_text_only needs a policy

This tool performs a read-only operation that retrieves and transforms web content into plain text format. It does not create, modify, delete, execute code, or perform financial operations. The most severe risk is potential scraping of copyrighted or sensitive content, but the tool itself is passive data retrieval. Given the server's stated adherence to robots.txt, the risk is further mitigated.

From the tool's definition Tool name 'extract_text_only' and description 'Extract plain text content without any formatting or HTML' indicate retrieval of data with no side effects or modifications.

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

POLICY

How to control extract_text_only

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_text_only:

policy.json

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

extract_text_only 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 →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about extract_text_only

What does the extract_text_only tool do? +

Extract plain text content without any formatting or HTML. 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_text_only? +

Register the MCP Web Scrape MCP server in PolicyLayer and add a rule for extract_text_only: 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_text_only? +

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

Can I rate-limit extract_text_only? +

Yes. Add a rate_limit block to the extract_text_only 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_text_only completely? +

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

extract_text_only 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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