create_clip · Mux MCP: Risk & Policy

WHAT IT DOES

What create_clip does on Mux

AI agents use create_clip to create or update resources in Mux — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mux environment.

WHY IT NEEDS A POLICY

Why create_clip needs a policy

This tool creates and persists new video clip assets based on existing content. This is a reversible write operation—clips can be deleted or recreated. It does not execute arbitrary code, delete data irreversibly, or move money.

From the tool's definition Tool description states 'Create a new short video clip from an existing Mux asset' and 'Returns the new clip asset', indicating creation of new data/assets in the Mux infrastructure.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_clip Rate-limited

create_clip 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": {
    "create_clip": {
      "limits": [
        {
          "counter": "create_clip_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 Mux, so you can run agents against it safely.

FAQ

Questions about create_clip

What does the create_clip tool do? +

Create a new short video clip from an existing Mux asset by specifying start and end timestamps (seconds). Returns the new clip asset. It is categorised as a Write tool in the Mux MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_clip? +

Register the Mux MCP server in PolicyLayer and add a rule for create_clip: 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 Mux. Nothing to install.

What risk level is create_clip? +

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

Can I rate-limit create_clip? +

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

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

create_clip is provided by the Mux MCP server (nobanks/mux-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.