set_position · vidMagik- MCP: Risk & Policy

WHAT IT DOES

What set_position does on vidMagik-mcp

AI agents use set_position 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_position needs a policy

This tool creates or modifies video composition state—specifically repositioning visual elements. While not destructive to source files, it transforms the output video irreversibly once rendered. This is a Write operation: it modifies project state in a way that affects rendered output. Severity is medium because misuse would produce unwanted visual output but doesn't delete data or execute arbitrary code.

From the tool's definition Tool modifies clip positioning (x/y coordinates or named positions like 'center', 'left') which changes video compositing output irreversibly in the rendered result, though the underlying source file remains unchanged.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_position Rate-limited

set_position 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_position": {
      "limits": [
        {
          "counter": "set_position_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_position

What does the set_position tool do? +

Set clip position. Use x/y for pixels, or pos_str for 'center', 'left', etc. 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_position? +

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

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

Can I rate-limit set_position? +

Yes. Add a rate_limit block to the set_position 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_position completely? +

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

set_position 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.