sendSms · Lofty MCP Server MCP: Risk & Policy

WHAT IT DOES

What sendSms does on Lofty MCP Server

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

WHY IT NEEDS A POLICY

Why sendSms needs a policy

Sending an SMS is a reversible write operation—the message is created and transmitted, affecting external state (lead communication history, their phone), but is not destructive (message can be conceptually undone or overwritten by follow-up messages). It's not Execute because it doesn't run arbitrary code/scripts. It's not Financial or Destructive.

From the tool's definition Tool name is 'sendSms' and description states 'Send an SMS message to a lead.' This performs a write/send action that creates a new SMS communication artifact.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sendSms Rate-limited

sendSms 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": {
    "sendSms": {
      "limits": [
        {
          "counter": "sendsms_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 Lofty MCP Server, so you can run agents against it safely.

FAQ

Questions about sendSms

What does the sendSms tool do? +

Send an SMS message to a lead. It is categorised as a Write tool in the Lofty 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 sendSms? +

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

What risk level is sendSms? +

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

Can I rate-limit sendSms? +

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

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

sendSms is provided by the Lofty MCP Server MCP server (nerdsnipe-inc/lofty-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.