AI agents call emails_list to retrieve information from HubSpot MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries email data with optional filtering parameters. It has no side effects—it does not create, modify, delete, or execute any operations. The 'list' operation is a standard read-only query operation that returns existing data. While emails may contain sensitive information, the tool itself performs a read-only operation with no destructive or financial impact.
From the tool's definition Tool name 'emails_list' and description 'List all emails with optional filtering' indicate retrieval of email data without modification or deletion.
Documented attack patterns abuse exactly the kind of access emails_list 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_list:
{
"version": "1",
"default": "deny",
"tools": {
"emails_list": {}
}
}emails_list is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all emails with optional filtering. It is categorised as a Read tool in the HubSpot MCP MCP Server, which means it retrieves data without modifying state.
Register the HubSpot MCP server in PolicyLayer and add a rule for emails_list: 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_list is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the emails_list 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_list. 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_list 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.