enhance_prompt

THE RISK

Medium Risk

Why enhance_prompt needs a policy

This tool falls into the Write category because it creates or modifies data (the enhanced prompt) in a reversible manner. While it calls an LLM via OpenRouter, the actual output is a text modification, not execution of arbitrary code or external operations.

From the tool's definition The tool 'enhance_prompt' uses an LLM to refine a prompt, which results in creating or modifying prompt text that is then used for subsequent video generation.

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

POLICY

How to control enhance_prompt

PolicyLayer is an MCP gateway — it sits between your AI agents and RunwayML + Luma AI MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for enhance_prompt:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "enhance_prompt": {
      "limits": [
        {
          "counter": "enhance_prompt_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

enhance_prompt 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.

Create a free account and register RunwayML + Luma AI MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More RunwayML + Luma AI MCP Server tools

Destructive luma_delete_generation Deletes a specific Luma AI generation. Execute generate_image_to_video Generates a video from an image using RunwayML or Luma AI. Execute generate_text_to_video Generates a video from text using RunwayML or Luma AI. Write luma_add_audio Adds audio to a specific Luma AI generation based on a prompt. Write luma_generate_image Generates an image using Luma AI. Write luma_upscale Upscales a specific Luma AI generation to a higher resolution. Read luma_get_camera_motions Lists supported camera motions for Luma AI prompts. Read luma_get_generation Gets details for a specific Luma AI generation.

All 10 RunwayML + Luma AI MCP Server tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about enhance_prompt

What does the enhance_prompt tool do? +

Uses an LLM (via OpenRouter) to refine a prompt for video generation. It is categorised as a Write tool in the RunwayML + Luma AI MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on enhance_prompt? +

Register the RunwayML + Luma AI MCP Server MCP server in PolicyLayer and add a rule for enhance_prompt: 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 RunwayML + Luma AI MCP Server. Nothing to install.

What risk level is enhance_prompt? +

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

Can I rate-limit enhance_prompt? +

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

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

enhance_prompt is provided by the RunwayML + Luma AI MCP Server MCP server (wheattoast11/mcp-video-gen). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every RunwayML + Luma AI MCP Server tool call.

Start from RunwayML + Luma AI MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →