vfx_head_blur · vidMagik- MCP: Risk & Policy

WHAT IT DOES

What vfx_head_blur does on vidMagik-mcp

AI agents invoke vfx_head_blur 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_head_blur needs a policy

This tool applies a video effect (head blur) using evaluated mathematical expressions for position parameters, which constitutes executing a transformation/processing operation on video content. It modifies video data in a reversible, non-destructive way (the source is not permanently altered), but since it involves executing expression evaluation and applying filters, Execute is more appropriate than Write.

From the tool's definition 'Blur moving head (requires math expressions for fx/fy positions, e.g., 100 + 50*t)' — applies a dynamic visual effect with evaluated math expressions over time, executing a transformation on video data

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

vfx_head_blur Rate-limited

vfx_head_blur 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_head_blur": {
      "limits": [
        {
          "counter": "vfx_head_blur_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_head_blur

What does the vfx_head_blur tool do? +

Blur moving head (requires math expressions for fx/fy positions, e.g., '100 + 50*t'). 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_head_blur? +

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

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

Can I rate-limit vfx_head_blur? +

Yes. Add a rate_limit block to the vfx_head_blur 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_head_blur completely? +

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

vfx_head_blur 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.