send_sms

THE RISK

High Risk

Sending an SMS triggers an external operation (message delivery to a phone number) with real-world effects. It is not merely writing data internally — it dispatches a message to a recipient, potentially incurring carrier costs and causing social/privacy harms if misused by an AI agent.

From the tool's definition Send an SMS message

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

HOW TO CONTROL SEND_SMS

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

policy.json

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

send_sms 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 PhonePi MCP — 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

More PhonePi MCP tools

Destructive delete_contact Delete a contact from the phone Destructive delete_snippet Delete a snippet from the phone Execute find_phone Make the phone beep to help locate it Execute make_call Make a phone call Execute set_timer Set a timer for a specific duration Write add_contact Add a new contact to the phone Write add_snippet Add a new snippet to the phone Write copy_to_clipboard Copy text to the phone clipboard

All 22 PhonePi MCP tools →

Execute tools on other servers

Frida Game Hacking MCP remove_breakpoint Procmon request_elevation WireMCP capture_packets Pentest Ai run_probe

Go deeper

High-risk tools in PhonePi MCP → 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.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

What does the send_sms tool do? +

Send an SMS message. It is categorised as a Execute tool in the PhonePi MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on send_sms? +

Register the PhonePi MCP server in PolicyLayer and add a rule for send_sms: 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 PhonePi MCP. Nothing to install.

What risk level is send_sms? +

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

Can I rate-limit send_sms? +

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

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

send_sms is provided by the PhonePi MCP server (priyankark/phonepi-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every PhonePi MCP tool call.

Deterministic rules across all 22 PhonePi MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

GOVERN PHONEPI →

Free to start. No card required.

22 PhonePi MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.

// WHAT SEND_SMS ON PHONEPI MCP DOES

// THE RISK

// HOW TO CONTROL SEND_SMS

// EXPLORE