extract_tables

THE RISK

Low Risk

Why extract_tables needs a policy

This tool retrieves and queries structured data (tables) from PDF documents without altering the original document or executing code. It produces no side effects beyond data retrieval. This is a classic Read operation: it fetches information but does not create, modify, delete, or execute anything.

From the tool's definition Tool name 'extract_tables' performs extraction (retrieval) of table data from PDF documents. Description states 'Extract tables from PDF' with no mention of modification, deletion, or execution capabilities.

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

POLICY

How to control extract_tables

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

policy.json

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

extract_tables 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 PDF — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

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_tables

What does the extract_tables tool do? +

Extract tables from PDF with automatic method selection. It is categorised as a Read tool in the MCP PDF MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on extract_tables? +

Register the MCP PDF MCP server in PolicyLayer and add a rule for extract_tables: 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 PDF. Nothing to install.

What risk level is extract_tables? +

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

Can I rate-limit extract_tables? +

Yes. Add a rate_limit block to the extract_tables 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_tables completely? +

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

extract_tables is provided by the MCP PDF MCP server (rsp2k/mcp-pdf). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP PDF tool call.

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

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