communications_subscribe_contact · HubSpot MCP Server MCP

WHAT IT DOES

What communications_subscribe_contact does on HubSpot MCP Server

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

WHY IT NEEDS A POLICY

Why communications_subscribe_contact needs a policy

This tool modifies a contact's communication preferences/subscription status, which is a write operation. It is reversible (the contact can be unsubscribed later), so it does not qualify as Destructive.

From the tool's definition Tool name 'subscribe_contact' and description 'Subscribe a contact to all email communications' indicate a modification to contact subscription status—a reversible state change in CRM data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

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.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches HubSpot MCP Server, so you can run agents against it safely.

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 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 communications_subscribe_contact? +

Register the HubSpot MCP Server 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 Server. 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 MCP server (kozo93/hubspot-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.