create_custom_value

THE RISK

Medium Risk

Why create_custom_value needs a policy

This tool creates new data (custom values) within a GoHighLevel location, which is a reversible write operation. It does not execute arbitrary code, delete data, or involve financial transactions. The 'create' verb and the context of adding configuration/customization data to a CRM location classifies it as Write.

From the tool's definition Tool name 'create_custom_value' and description 'Create a new custom value in a location' indicate creation of new data within the CRM system.

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

POLICY

How to control create_custom_value

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

policy.json

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

create_custom_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.

Create a free account and register GoHighLevel 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.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More GoHighLevel MCP Server tools

Destructive delete_appointment Delete an appointment Destructive delete_contact Delete a contact from GoHighLevel Destructive delete_contact_note Delete a note from a contact Destructive delete_contact_task Delete a task from a contact Destructive delete_custom_field Delete a custom field Destructive delete_custom_value Delete a custom value Destructive delete_opportunity Delete an opportunity from GoHighLevel Destructive delete_user Delete a user

All 64 GoHighLevel MCP Server tools →

Write tools on other servers

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Go deeper

Govern customer-ops agents → PII redaction, approval on external messages, and no-bulk-delete rules on the records agents change.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about create_custom_value

What does the create_custom_value tool do? +

Create a new custom value in a location. It is categorised as a Write tool in the GoHighLevel 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_value? +

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

What risk level is create_custom_value? +

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

Can I rate-limit create_custom_value? +

Yes. Add a rate_limit block to the create_custom_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 create_custom_value completely? +

Set action: deny in the PolicyLayer policy for create_custom_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 create_custom_value? +

create_custom_value is provided by the GoHighLevel MCP Server MCP server (basicmachines-co/open-ghl-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every GoHighLevel MCP Server tool call.

Start from GoHighLevel 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 →