set_mask · vidMagik- MCP: Risk & Policy

WHAT IT DOES

What set_mask does on vidMagik-mcp

AI agents use set_mask 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 set_mask needs a policy

This tool modifies clip metadata/properties (the mask) rather than executing arbitrary code or destructively deleting content. Masks in video editing are visual effect parameters that can be changed, removed, or adjusted. The action is reversible and creates/modifies data within the video editing context.

From the tool's definition Tool name 'set_mask' and description 'Set the mask of a clip' indicate modification of clip properties. Within a video editing context (MoviePy), setting a mask modifies clip attributes reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_mask Rate-limited

set_mask 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": {
    "set_mask": {
      "limits": [
        {
          "counter": "set_mask_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 set_mask

What does the set_mask tool do? +

Set the mask of a 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 set_mask? +

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

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

Can I rate-limit set_mask? +

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

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

set_mask 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.