list_capabilities

THE RISK

Low Risk

Why list_capabilities needs a policy

This tool performs information discovery only. It returns a list of capabilities without modifying, executing code, deleting, or creating any data. The read-only nature and lack of any actionable side effects place it squarely in the Read category with low severity.

From the tool's definition Tool name is 'list_capabilities' and description states it 'List all available PDF processing capabilities' — this is a query/enumeration operation that retrieves metadata about available functions with no side effects on documents or data.

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

POLICY

How to control list_capabilities

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 list_capabilities:

policy.json

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

list_capabilities 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 →

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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 list_capabilities

What does the list_capabilities tool do? +

List all available PDF processing capabilities. 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 list_capabilities? +

Register the MCP PDF MCP server in PolicyLayer and add a rule for list_capabilities: 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 list_capabilities? +

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

Can I rate-limit list_capabilities? +

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

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

list_capabilities 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.

CHECK YOUR STACK →