zernio_create_custom_field

Create a new custom field for contacts.

SERVERZernio SOURCEeyalm321/zernio-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/eyalm321-zernio-mcp/zernio-create-custom-field.md

WHAT IT DOES

What zernio_create_custom_field does on Zernio

AI agents use zernio_create_custom_field to create or update resources in Zernio, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Zernio environment.

RISK

Why zernio_create_custom_field is rated Medium

This tool creates (writes) a new custom field structure for contacts, which is a reversible action. It does not delete data (not Destructive), does not execute arbitrary code (not Execute), involves no financial transactions (not Financial), and produces side effects limited to schema extension.

From the tool's definition Tool name contains 'create' and description states 'Create a new custom field for contacts' — a reversible data creation operation that modifies contact schema.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs zernio_create_custom_field safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Zernio, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For zernio_create_custom_field, this is the rule to start with:

zernio_create_custom_field Rate-limited

zernio_create_custom_field stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "zernio_create_custom_field": {
      "limits": [
        {
          "counter": "zernio_create_custom_field_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Zernio, apply this rule, and every zernio_create_custom_field call is checked against it from then on.

FAQ

Questions about zernio_create_custom_field

What does the zernio_create_custom_field tool do? +

Create a new custom field for contacts. It is categorised as a Write tool in the Zernio MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on zernio_create_custom_field? +

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

What risk level is zernio_create_custom_field? +

zernio_create_custom_field is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit zernio_create_custom_field? +

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

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

zernio_create_custom_field is provided by the Zernio MCP server (eyalm321/zernio-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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