verse_get_schema

THE RISK

Low Risk

Why verse_get_schema needs a policy

This tool retrieves structural metadata (properties, events, functions) about device classes from digest files. It is purely informational with no side effects, data modification, code execution, or destructive operations. The blast radius of misuse is minimal - an agent could only gather schema information, which is non-sensitive metadata about Verse language structures.

From the tool's definition Tool name contains 'get' and description states 'Get Verse schema...from .digest files' - a retrieval operation with no modification or execution capability.

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

POLICY

How to control verse_get_schema

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_get_schema:

policy.json

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

verse_get_schema 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 Uefn — 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 verse_get_schema

What does the verse_get_schema tool do? +

Get Verse schema (properties, events, functions) for a device class from .digest files. It is categorised as a Read tool in the Uefn MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on verse_get_schema? +

Register the Uefn MCP server in PolicyLayer and add a rule for verse_get_schema: 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_get_schema? +

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

Can I rate-limit verse_get_schema? +

Yes. Add a rate_limit block to the verse_get_schema 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_get_schema completely? +

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

verse_get_schema 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.

CHECK YOUR STACK →