sendSystemSmsToAgent · Lofty MCP Server MCP: Risk & Policy

WHAT IT DOES

What sendSystemSmsToAgent does on Lofty MCP Server

AI agents use sendSystemSmsToAgent 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 sendSystemSmsToAgent needs a policy

This tool sends an SMS message, which is a reversible write action that creates new data (a message record) in the system. While it communicates with an agent, it does not delete data (not Destructive), execute arbitrary code (not Execute), or move money (not Financial).

From the tool's definition Tool name 'sendSystemSmsToAgent' and description 'Send a system SMS message to an agent' indicate this creates/sends a message, which is a Write operation that modifies communication state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sendSystemSmsToAgent Rate-limited

sendSystemSmsToAgent 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": {
    "sendSystemSmsToAgent": {
      "limits": [
        {
          "counter": "sendsystemsmstoagent_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 sendSystemSmsToAgent

What does the sendSystemSmsToAgent tool do? +

Send a system SMS message to an agent. 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 sendSystemSmsToAgent? +

Register the Lofty MCP Server MCP server in PolicyLayer and add a rule for sendSystemSmsToAgent: 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 sendSystemSmsToAgent? +

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

Can I rate-limit sendSystemSmsToAgent? +

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

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

sendSystemSmsToAgent 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.