vfx_freeze_region · vidMagik- MCP: Risk & Policy

WHAT IT DOES

What vfx_freeze_region does on vidMagik-mcp

AI agents invoke vfx_freeze_region to trigger actions in vidMagik-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 vfx_freeze_region needs a policy

This tool applies a visual effect (freezing a region of a video) which constitutes executing a transformation operation. It doesn't read data, write/create new files directly, or delete anything irreversibly based on the description. The description is minimal, lowering confidence. Classified as Execute due to it triggering an external video processing operation whose effects depend on arguments.

From the tool's definition 'Freeze a region' — triggers a video effect operation on a clip region using MoviePy

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

vfx_freeze_region Rate-limited

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

FAQ

Questions about vfx_freeze_region

What does the vfx_freeze_region tool do? +

Freeze a region. It is categorised as a Execute tool in the vidMagik-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 vfx_freeze_region? +

Register the vidMagik- MCP server in PolicyLayer and add a rule for vfx_freeze_region: 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_freeze_region? +

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

Can I rate-limit vfx_freeze_region? +

Yes. Add a rate_limit block to the vfx_freeze_region 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_freeze_region completely? +

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

vfx_freeze_region 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.