send_voice · Seven MCP: Risk & Policy

WHAT IT DOES

What send_voice does on Seven

AI agents invoke send_voice to trigger actions in Seven. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why send_voice needs a policy

This tool initiates an outbound voice call using text-to-speech, which is an external operation with real-world effects (phone calls are placed to recipients). It triggers external telephony infrastructure and may incur costs, but is not directly a financial transaction. It falls under Execute as it triggers an external operation whose effects depend on the arguments (the number called and the message spoken).

From the tool's definition Send a voice call with text-to-speech

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_voice Rate-limited

send_voice 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.

View as policy code

policy.json

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

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Seven, so you can run agents against it safely.

FAQ

Questions about send_voice

What does the send_voice tool do? +

Send a voice call with text-to-speech. It is categorised as a Execute tool in the Seven 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_voice? +

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

What risk level is send_voice? +

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

Can I rate-limit send_voice? +

Yes. Add a rate_limit block to the send_voice 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_voice completely? +

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

send_voice is provided by the Seven MCP server (seven-io/seven-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.