vfx_crop · vidMagik- MCP: Risk & Policy

WHAT IT DOES

What vfx_crop does on vidMagik-mcp

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

WHY IT NEEDS A POLICY

Why vfx_crop needs a policy

Cropping modifies video data in a new output (reversible write operation). While non-destructive in intent, it transforms media content and could produce unintended results if applied incorrectly by an AI agent (e.g., cropping away critical content). Severity is medium because the operation is reversible and the blast radius is limited to the output video artifact, not permanent data loss or external systems.

From the tool's definition Tool name 'vfx_crop' and description 'Crop clip' indicate modification of video content. Cropping is a reversible transformation that alters video dimensions/framing without deleting the source file.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

vfx_crop Rate-limited

vfx_crop 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": {
    "vfx_crop": {
      "limits": [
        {
          "counter": "vfx_crop_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 vidMagik-mcp, so you can run agents against it safely.

FAQ

Questions about vfx_crop

What does the vfx_crop tool do? +

Crop clip. It is categorised as a Write tool in the vidMagik-mcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on vfx_crop? +

Register the vidMagik- MCP server in PolicyLayer and add a rule for vfx_crop: 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 vidMagik-mcp. Nothing to install.

What risk level is vfx_crop? +

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

Can I rate-limit vfx_crop? +

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

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

vfx_crop is provided by the vidMagik- MCP server (vizionik25/vidmagik-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.