send_voice · Tg MCP: Risk & Policy

WHAT IT DOES

What send_voice does on Tgmcp

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

WHY IT NEEDS A POLICY

Why send_voice needs a policy

This tool creates new data (a voice message) in a reversible manner—messages can be deleted or edited afterward. It does not execute arbitrary code, delete data permanently, or involve financial transactions. Write is the appropriate category.

From the tool's definition 'Send a voice message to a chat' indicates creation of new content (a message) in an existing chat, which is a write operation. The tool modifies chat state by adding a new message artifact.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_voice Rate-limited

send_voice 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": {
    "send_voice": {
      "limits": [
        {
          "counter": "send_voice_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 Tgmcp, so you can run agents against it safely.

FAQ

Questions about send_voice

What does the send_voice tool do? +

Send a voice message to a chat. File must be an OGG/OPUS voice note. It is categorised as a Write tool in the Tgmcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on send_voice? +

Register the Tg 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 Tgmcp. Nothing to install.

What risk level is send_voice? +

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

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 Tg MCP server (oevortex/tgmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.