communications_subscribe_contact

Subscribe a contact to all email communications

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/communications-subscribe-contact.md

WHAT IT DOES

What communications_subscribe_contact does on HubSpot MCP

AI agents use communications_subscribe_contact 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 communications_subscribe_contact is rated Medium

This tool modifies a contact's communication preferences by subscribing them to email communications. This is a Write operation because it changes data state reversibly (subscriptions can be toggled or unsubscribed). While it affects contact records, it does not delete data, execute arbitrary code, or commit financial transactions.

From the tool's definition Tool name 'communications_subscribe_contact' and description 'Subscribe a contact to all email communications' indicate creating or modifying a contact's subscription state, which is a reversible data modification.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

communications_subscribe_contact Rate-limited

communications_subscribe_contact 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": {
    "communications_subscribe_contact": {
      "limits": [
        {
          "counter": "communications_subscribe_contact_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 communications_subscribe_contact call is checked against it from then on.

FAQ

Questions about communications_subscribe_contact

What does the communications_subscribe_contact tool do? +

Subscribe a contact to all email communications. 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 communications_subscribe_contact? +

Register the HubSpot MCP server in PolicyLayer and add a rule for communications_subscribe_contact: 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 communications_subscribe_contact? +

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

Can I rate-limit communications_subscribe_contact? +

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

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

communications_subscribe_contact 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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