hs_update_contact · Hubspot MCP: Risk & Policy

WHAT IT DOES

What hs_update_contact does on Hubspot

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

WHY IT NEEDS A POLICY

Why hs_update_contact needs a policy

This tool modifies contact records in HubSpot's CRM by updating their properties. It is reversible (changes can be undone by updating again with different values), making it Write rather than Destructive.

From the tool's definition Tool name 'hs_update_contact' and description 'Update one or more properties on an existing contact' indicate modification of existing data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

hs_update_contact Rate-limited

hs_update_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": {
    "hs_update_contact": {
      "limits": [
        {
          "counter": "hs_update_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, so you can run agents against it safely.

FAQ

Questions about hs_update_contact

What does the hs_update_contact tool do? +

Update one or more properties on an existing contact. It is categorised as a Write tool in the Hubspot MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on hs_update_contact? +

Register the Hubspot MCP server in PolicyLayer and add a rule for hs_update_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. Nothing to install.

What risk level is hs_update_contact? +

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

Can I rate-limit hs_update_contact? +

Yes. Add a rate_limit block to the hs_update_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 hs_update_contact completely? +

Set action: deny in the PolicyLayer policy for hs_update_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 hs_update_contact? +

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