smartlead_forward_reply

THE RISK

High Risk

Why smartlead_forward_reply needs a policy

Forwarding an email triggers an external operation — sending an email to a third party. It doesn't just read or write data in the system; it actively dispatches a message outside the platform. This qualifies as Execute since the effect depends on arguments (target address, reply content) and involves triggering an external communication action. Misuse could expose lead conversation data to unintended recipients.

From the tool's definition Forward a lead reply to another email address or team member

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

POLICY

How to control smartlead_forward_reply

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_forward_reply:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "smartlead_forward_reply": {
      "limits": [
        {
          "counter": "smartlead_forward_reply_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

smartlead_forward_reply stays usable, but rate-capped — a runaway agent can't fire it dozens of times 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.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 116 SmartLead MCP Server tools →

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Go deeper

High-risk tools in SmartLead MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about smartlead_forward_reply

What does the smartlead_forward_reply tool do? +

Forward a lead reply to another email address or team member. It is categorised as a Execute tool in the SmartLead MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on smartlead_forward_reply? +

Register the SmartLead MCP Server MCP server in PolicyLayer and add a rule for smartlead_forward_reply: 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_forward_reply? +

smartlead_forward_reply is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit smartlead_forward_reply? +

Yes. Add a rate_limit block to the smartlead_forward_reply 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_forward_reply completely? +

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

smartlead_forward_reply 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 →