create_custom_field

Create a new custom field definition. The field key must be unique within the account.

SERVERinstantKOM MCP Server SOURCEinstantkom/mcp-server

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/instantkom-mcp-server/create-custom-field.md

WHAT IT DOES

What create_custom_field does on instantKOM MCP Server

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

RISK

Why create_custom_field is rated Medium

The tool creates a new custom field definition in the instantKOM platform. This is a Write operation as it creates new metadata/schema elements that can be modified or removed later. Severity is medium because creating custom fields could enable data collection practices or schema changes that affect multiple users, but the action is reversible (fields can be deleted).

From the tool's definition Tool description states 'Create a new custom field definition', which is a create operation that modifies the account schema reversibly.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create_custom_field safely

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

create_custom_field Rate-limited

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": {
    "create_custom_field": {
      "limits": [
        {
          "counter": "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 instantKOM MCP Server, apply this rule, and every create_custom_field call is checked against it from then on.

FAQ

Questions about create_custom_field

What does the create_custom_field tool do? +

Create a new custom field definition. The field key must be unique within the account. It is categorised as a Write tool in the instantKOM MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_custom_field? +

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

What risk level is create_custom_field? +

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 create_custom_field? +

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

Set action: deny in the PolicyLayer policy for 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 create_custom_field? +

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

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