convert_document_with_images

THE RISK

Low Risk

Why convert_document_with_images needs a policy

This tool reads/fetches a document from a URL or local path and converts it to markdown with embedded images. It performs a read/conversion operation with no side effects — it does not write, modify, delete, or execute anything. The output is returned to the caller without persisting changes.

From the tool's definition Convert a document from a URL or local path to markdown format and return embedded images

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

POLICY

How to control convert_document_with_images

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

policy.json

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

convert_document_with_images 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 Docling Server — 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

Related tools and policies

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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 convert_document_with_images

What does the convert_document_with_images tool do? +

Convert a document from a URL or local path to markdown format and return embedded images. It is categorised as a Read tool in the MCP Docling Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on convert_document_with_images? +

Register the MCP Docling Server MCP server in PolicyLayer and add a rule for convert_document_with_images: 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 Docling Server. Nothing to install.

What risk level is convert_document_with_images? +

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

Can I rate-limit convert_document_with_images? +

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

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

convert_document_with_images is provided by the MCP Docling Server MCP server (zanetworker/mcp-docling). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Docling Server tool call.

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

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