set_contact_custom_field_value

Set a single custom field value for a contact

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-field-value.md

WHAT IT DOES

What set_contact_custom_field_value does on instantKOM MCP Server

AI agents use set_contact_custom_field_value 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_field_value is rated Medium

The tool creates or modifies contact metadata (custom field values) reversibly. It does not delete data, execute arbitrary code, move money, or trigger external operations with unpredictable side effects.

From the tool's definition Tool name includes 'set' and description states 'Set a single custom field value for a contact' — this modifies contact data in the instantKOM platform.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

set_contact_custom_field_value Rate-limited

set_contact_custom_field_value 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_field_value": {
      "limits": [
        {
          "counter": "set_contact_custom_field_value_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_field_value call is checked against it from then on.

FAQ

Questions about set_contact_custom_field_value

What does the set_contact_custom_field_value tool do? +

Set a single custom field value for a contact. 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_field_value? +

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

set_contact_custom_field_value 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_field_value? +

Yes. Add a rate_limit block to the set_contact_custom_field_value 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_field_value completely? +

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

set_contact_custom_field_value 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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