get_field_metadata

THE RISK

Low Risk

Why get_field_metadata needs a policy

This tool retrieves metadata about field definitions in the CRM system. It performs a read-only query operation that returns structural information about the data model without creating, modifying, deleting, or executing any actions. The blast radius of misuse is minimal since metadata disclosure alone does not compromise core data or trigger external operations.

From the tool's definition Tool name is 'get_field_metadata' and description states 'Get detailed information about fields' — a retrieval operation with no side effects.

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

POLICY

How to control get_field_metadata

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

policy.json

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

get_field_metadata 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 Twenty 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.

CAP THIS TOOL →

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EXPLORE

Related tools and policies

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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_field_metadata

What does the get_field_metadata tool do? +

Get detailed information about fields, either for a specific object or across all objects. It is categorised as a Read tool in the Twenty MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_field_metadata? +

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

What risk level is get_field_metadata? +

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

Can I rate-limit get_field_metadata? +

Yes. Add a rate_limit block to the get_field_metadata 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_field_metadata completely? +

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

get_field_metadata is provided by the Twenty MCP Server MCP server (jezweb/twenty-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Twenty MCP Server tool call.

Start from Twenty 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 →