wrapper

THE RISK

Low Risk

Why wrapper needs a policy

The description 'MCP tool wrapper function' provides no actionable information about what this tool does, reads, writes, executes, or destroys. It could be a generic wrapper around any of the sibling tools. Without meaningful evidence of its behavior, it cannot be reliably classified into any specific risk category. Confidence is very low due to the uninformative description.

From the tool's definition Tool name is 'wrapper' with description 'MCP tool wrapper function.' - completely uninformative about what the tool actually does

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

POLICY

How to control wrapper

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "wrapper": {
      "limits": [
        {
          "counter": "wrapper_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

wrapper gets a rate cap, and everything else on the server is denied unless you say otherwise.

Create a free account and register YaraFlux MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

SET A RULE FOR 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.
Tool risk categories → How PolicyLayer classifies MCP tools by what they can do.
MCP tool → What an MCP tool is and how clients discover and call it.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about wrapper

What does the wrapper tool do? +

MCP tool wrapper function. It is categorised as a Other tool in the YaraFlux MCP Server MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on wrapper? +

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

What risk level is wrapper? +

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

Can I rate-limit wrapper? +

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

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

wrapper is provided by the YaraFlux MCP Server MCP server (threatflux/yaraflux). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every YaraFlux MCP Server tool call.

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

CHECK YOUR STACK →