crm_create_contact_property

Create a new contact property

SERVERHubSpot MCP SOURCEblacksand-software/hubspot-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/blacksand-software-hubspot-mcp/crm-create-contact-property.md

WHAT IT DOES

What crm_create_contact_property does on HubSpot MCP

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

RISK

Why crm_create_contact_property is rated Medium

This tool creates a new contact property (a data schema field), which is a reversible write operation. It modifies the structure of contact records but does not delete data, execute arbitrary code, or move money. The blast radius is medium because misconfigured properties could impact data quality or compliance across many contacts, but the action is reversible through property deletion or updates.

From the tool's definition Tool name 'crm_create_contact_property' and description 'Create a new contact property' indicate data creation/modification. Creates a new property schema in the CRM system.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs crm_create_contact_property safely

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

crm_create_contact_property Rate-limited

crm_create_contact_property 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": {
    "crm_create_contact_property": {
      "limits": [
        {
          "counter": "crm_create_contact_property_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 HubSpot MCP, apply this rule, and every crm_create_contact_property call is checked against it from then on.

FAQ

Questions about crm_create_contact_property

What does the crm_create_contact_property tool do? +

Create a new contact property. It is categorised as a Write tool in the HubSpot MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on crm_create_contact_property? +

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

What risk level is crm_create_contact_property? +

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

Can I rate-limit crm_create_contact_property? +

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

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

crm_create_contact_property is provided by the HubSpot MCP server (blacksand-software/hubspot-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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