AI agents use emails_create 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.
This tool creates new email records in HubSpot's CRM system, which is a reversible write operation. While it modifies data, emails can be deleted or archived, making it Write rather than Destructive. The severity is medium because misuse could create spam emails, unwanted contact attempts, or pollute CRM data, but the impact is limited to data creation without financial or irreversible consequences.
From the tool's definition Tool name 'emails_create' combined with description 'Create a new email record' clearly indicates a create operation that adds new data to the system.
Documented attack patterns abuse exactly the kind of access emails_create gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and HubSpot MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for emails_create:
{
"version": "1",
"default": "deny",
"tools": {
"emails_create": {
"limits": [
{
"counter": "emails_create_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}emails_create 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.
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Create a new email record. 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.
Register the HubSpot MCP server in PolicyLayer and add a rule for emails_create: 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.
emails_create is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the emails_create 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.
Set action: deny in the PolicyLayer policy for emails_create. 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.
emails_create is provided by the HubSpot MCP server (shinzo-labs/hubspot-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 112 HubSpot MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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112 HubSpot MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.