set_duration · vidMagik- MCP: Risk & Policy

WHAT IT DOES

What set_duration does on vidMagik-mcp

AI agents use set_duration 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_duration needs a policy

The tool modifies an existing clip's duration property, which is a write/edit operation. It is reversible (duration can be set again to a different value), so it does not qualify as Destructive. It does not execute arbitrary code (Execute category) or move financial resources (Financial category).

From the tool's definition Tool name 'set_duration' and description 'Set clip duration' indicates modification of clip properties. This is a reversible write operation that alters clip metadata/duration without deleting or executing arbitrary code.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_duration Rate-limited

set_duration 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_duration": {
      "limits": [
        {
          "counter": "set_duration_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_duration

What does the set_duration tool do? +

Set clip duration. 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_duration? +

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

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

Can I rate-limit set_duration? +

Yes. Add a rate_limit block to the set_duration 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_duration completely? +

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

set_duration 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.