narrate_book · Lightpaper MCP: Risk & Policy

WHAT IT DOES

What narrate_book does on Lightpaper Mcp

AI agents invoke narrate_book to trigger actions in Lightpaper 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 narrate_book needs a policy

This tool triggers an external AI narration operation that processes a published book and generates an audiobook. It runs an AI-driven transformation pipeline (Execute category), and misuse could consume significant compute resources, incur costs, or produce unintended audio outputs at scale. It is not purely a write operation because it involves executing an AI process rather than simply storing data.

From the tool's definition Turn a published book into an audiobook using AI narration

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

narrate_book Rate-limited

narrate_book 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": {
    "narrate_book": {
      "limits": [
        {
          "counter": "narrate_book_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 Lightpaper Mcp, so you can run agents against it safely.

FAQ

Questions about narrate_book

What does the narrate_book tool do? +

Turn a published book into an audiobook using AI narration. It is categorised as a Execute tool in the Lightpaper 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 narrate_book? +

Register the Lightpaper MCP server in PolicyLayer and add a rule for narrate_book: 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 Lightpaper Mcp. Nothing to install.

What risk level is narrate_book? +

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

Can I rate-limit narrate_book? +

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

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

narrate_book is provided by the Lightpaper MCP server (pypi:lightpaper-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.