text_to_speech

THE RISK

High Risk

Why text_to_speech needs a policy

This tool triggers an external operation (TTS engine execution) and can either play audio directly on the system or write audio files to disk. The execution of external TTS engines and the ability to play audio or save files makes this an Execute-category tool. Misuse could involve playing unwanted audio, consuming system resources, or writing arbitrary audio files to disk.

From the tool's definition 'Convert text to speech using various TTS engines. Can play audio directly or save to file.'

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

POLICY

How to control text_to_speech

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

policy.json

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

text_to_speech 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 A-Modular-Kingdom — 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

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Go deeper

High-risk tools in A-Modular-Kingdom → 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.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about text_to_speech

What does the text_to_speech tool do? +

Convert text to speech using various TTS engines. Can play audio directly or save to file. It is categorised as a Execute tool in the A-Modular-Kingdom MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on text_to_speech? +

Register the A-Modular-Kingdom MCP server in PolicyLayer and add a rule for text_to_speech: 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 A-Modular-Kingdom. Nothing to install.

What risk level is text_to_speech? +

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

Can I rate-limit text_to_speech? +

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

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

text_to_speech is provided by the A-Modular-Kingdom MCP server (masihmoafi/a-modular-kingdom). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every A-Modular-Kingdom tool call.

Start from A-Modular-Kingdom, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →