speak · Edge TTS MCP: Risk & Policy

WHAT IT DOES

What speak does on Edge TTS MCP

AI agents invoke speak to trigger actions in Edge TTS MCP. 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 speak needs a policy

Based on the server context, 'speak' almost certainly triggers audio playback via the Edge TTS engine — an external operation with side effects (audio output). This is an Execute-category action. The description is empty, which reduces confidence. Severity is medium because misuse could cause unwanted audio output but has limited blast radius.

From the tool's definition Tool name 'speak' on a TTS server described as enabling Claude to 'speak using Microsoft Edge TTS'; description is empty.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

speak Rate-limited

speak 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": {
    "speak": {
      "limits": [
        {
          "counter": "speak_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 Edge TTS MCP, so you can run agents against it safely.

FAQ

Questions about speak

What does the speak tool do? +

speak. It is categorised as a Execute tool in the Edge TTS 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 speak? +

Register the Edge TTS MCP server in PolicyLayer and add a rule for speak: 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 Edge TTS MCP. Nothing to install.

What risk level is speak? +

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

Can I rate-limit speak? +

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

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

speak is provided by the Edge TTS MCP server (s-n-n/edge-tts-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.