generate_video · Fal Ai MCP: Risk & Policy

WHAT IT DOES

What generate_video does on Fal Ai

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

WHY IT NEEDS A POLICY

Why generate_video needs a policy

This tool creates new content (a video) by calling an external AI API. It is a Write operation as it produces and likely stores or returns a new artifact. No code execution, deletion, or financial transaction is involved. Severity is high because it triggers external API calls that may incur costs and generate potentially large media assets, and misuse could result in unwanted content generation at scale.

From the tool's definition Generate a video based on a prompt and an initial image using the wan-i2v/turbo model.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

generate_video Rate-limited

generate_video 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": {
    "generate_video": {
      "limits": [
        {
          "counter": "generate_video_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 Fal Ai, so you can run agents against it safely.

FAQ

Questions about generate_video

What does the generate_video tool do? +

Generate a video based on a prompt and an initial image using the wan-i2v/turbo model. It is categorised as a Write tool in the Fal Ai MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on generate_video? +

Register the Fal Ai MCP server in PolicyLayer and add a rule for generate_video: 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 Fal Ai. Nothing to install.

What risk level is generate_video? +

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

Can I rate-limit generate_video? +

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

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

generate_video is provided by the Fal Ai MCP server (piebro/fal-ai-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.