validate_html

THE RISK

Low Risk

Why validate_html needs a policy

The tool performs validation checks on HTML documents, which is a read-only operation that retrieves and analyzes properties of web content. No data is created, modified, deleted, or executed. This is consistent with the broader server purpose of analyzing and transforming web content into Markdown. The validation results provide information for assessment but do not alter state or trigger external operations.

From the tool's definition Tool name 'validate_html' and description 'Validate HTML structure, accessibility, and SEO' indicate analysis and inspection of HTML without modifying, deleting, or executing code. Validation is a passive inspection operation.

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

POLICY

How to control validate_html

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 validate_html:

policy.json

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

validate_html 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 validate_html

What does the validate_html tool do? +

Validate HTML structure, accessibility, and SEO. 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 validate_html? +

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

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

Can I rate-limit validate_html? +

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

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

validate_html 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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