set_contact_custom_fields

Set multiple custom field values for a contact at once

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/set-contact-custom-fields.md

WHAT IT DOES

What set_contact_custom_fields does on instantKOM MCP Server

AI agents use set_contact_custom_fields 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 set_contact_custom_fields is rated Medium

This tool modifies contact records by updating custom fields, which is a write operation (creates/modifies data reversibly). Severity is medium because while the changes affect user contact data, they are reversible and do not involve deletion, financial transactions, or code execution. Confidence is high due to the clear semantic of 'set' and 'custom field values' indicating a data update operation.

From the tool's definition Tool sets/modifies custom field values for a contact via 'set' action, which creates or updates contact metadata. The description explicitly states it sets 'multiple custom field values', indicating reversible data modification.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set_contact_custom_fields 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 set_contact_custom_fields, this is the rule to start with:

set_contact_custom_fields Rate-limited

set_contact_custom_fields 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": {
    "set_contact_custom_fields": {
      "limits": [
        {
          "counter": "set_contact_custom_fields_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 set_contact_custom_fields call is checked against it from then on.

FAQ

Questions about set_contact_custom_fields

What does the set_contact_custom_fields tool do? +

Set multiple custom field values for a contact at once. 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 set_contact_custom_fields? +

Register the instantKOM MCP Server MCP server in PolicyLayer and add a rule for set_contact_custom_fields: 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 set_contact_custom_fields? +

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

Can I rate-limit set_contact_custom_fields? +

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

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

set_contact_custom_fields 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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