smartlead_add_client_to_system

THE RISK

Medium Risk

Why smartlead_add_client_to_system needs a policy

This tool creates a new client entity in the SmartLead system, which is a reversible Write operation. It modifies system state by adding data but does not execute arbitrary code, delete data, or move money. The severity is medium because adding unauthorized clients could expand platform access or enable fraudulent marketing campaigns, but the impact is bounded to the SmartLead system and can be undone.

From the tool's definition Tool name 'add_client_to_system' and description 'Add a new client to the SmartLead system' indicate creation of a new account/client record in the system.

Documented attack patterns abuse exactly the kind of access smartlead_add_client_to_system gives an agent:

POLICY

How to control smartlead_add_client_to_system

PolicyLayer is an MCP gateway — it sits between your AI agents and SmartLead MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for smartlead_add_client_to_system:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "smartlead_add_client_to_system": {
      "limits": [
        {
          "counter": "smartlead_add_client_to_system_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

smartlead_add_client_to_system 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.

Create a free account and register SmartLead MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More SmartLead MCP Server tools

Financial smartlead_place_order_for_mailboxes Place an order for specific mailboxes with a vendor. Destructive smartlead_delete_campaign Permanently delete a campaign and all associated data. This action cannot be undone. Destructive smartlead_delete_campaign_webhook Delete a specific webhook from a campaign. Destructive smartlead_delete_client_api_key Delete a specific API key. Destructive smartlead_delete_folder Delete a smart delivery folder by ID. Destructive smartlead_delete_lead_by_campaign Remove a lead from a specific campaign permanently. Destructive smartlead_delete_tests_in_bulk Delete multiple smart delivery tests at once for cleanup purposes. Destructive smartlead_remove_email_account_from_campaign Remove an email account from a specific campaign.

All 116 SmartLead MCP Server tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about smartlead_add_client_to_system

What does the smartlead_add_client_to_system tool do? +

Add a new client to the SmartLead system (whitelabel or not). It is categorised as a Write tool in the SmartLead 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 smartlead_add_client_to_system? +

Register the SmartLead MCP Server MCP server in PolicyLayer and add a rule for smartlead_add_client_to_system: 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 SmartLead MCP Server. Nothing to install.

What risk level is smartlead_add_client_to_system? +

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

Can I rate-limit smartlead_add_client_to_system? +

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

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

smartlead_add_client_to_system is provided by the SmartLead MCP Server MCP server (win8428/smartlead-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every SmartLead MCP Server tool call.

Start from SmartLead MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →