get_registry_data

THE RISK

Low Risk

Why get_registry_data needs a policy

This tool retrieves and queries Minecraft registry data. Although it 'runs the data generator if not cached,' this is a read-like operation that generates or loads existing data structures without creating, modifying, or deleting persistent game data. The output is informational registry metadata. No side effects on game state or persistent modifications occur. This is a classic Read category use case.

From the tool's definition Tool description states 'Get Minecraft registry data' and 'runs the data generator if not cached' — these are retrieval/query operations with no modification of data. The tool reads existing registry information (blocks, items, entities, etc.) from Minecraft.

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

POLICY

How to control get_registry_data

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

policy.json

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

get_registry_data 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 Minecraft Dev MCP — 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

Related tools and policies

More Minecraft Dev MCP tools

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All 20 Minecraft Dev MCP tools →

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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 get_registry_data

What does the get_registry_data tool do? +

Get Minecraft registry data (blocks, items, entities, etc.). This runs the data generator if not cached. It is categorised as a Read tool in the Minecraft Dev MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_registry_data? +

Register the Minecraft Dev MCP server in PolicyLayer and add a rule for get_registry_data: 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 Minecraft Dev MCP. Nothing to install.

What risk level is get_registry_data? +

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

Can I rate-limit get_registry_data? +

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

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

get_registry_data is provided by the Minecraft Dev MCP server (mcdxai/minecraft-dev-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Minecraft Dev MCP tool call.

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

CHECK YOUR STACK →