verse_gen_custom

THE RISK

Low Risk

Why verse_gen_custom needs a policy

The name suggests generating custom Verse code (UEFN's scripting language), which could be an Execute or Write action, but without a description we cannot confirm. Based on sibling tools and context, it likely generates or writes Verse code. Confidence is low due to empty description. Defaulting to Other with medium severity as code generation in a live editor could have meaningful impact.

From the tool's definition Tool name is 'verse_gen_custom' but description is empty and uninformative.

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

POLICY

How to control verse_gen_custom

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

policy.json

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

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

Create a free account and register Uefn — 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 →

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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.
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 verse_gen_custom

What does the verse_gen_custom tool do? +

verse_gen_custom. It is categorised as a Other tool in the Uefn MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on verse_gen_custom? +

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

What risk level is verse_gen_custom? +

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

Can I rate-limit verse_gen_custom? +

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

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

verse_gen_custom is provided by the Uefn MCP server (quangdang46/uefn-verse-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Uefn tool call.

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

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