transport_skip_backward

THE RISK

High Risk

Why transport_skip_backward needs a policy

This tool controls media transport playback by skipping backward in time on a specified layer within ProPresenter 7. It executes an external operation that changes the playback state of a live presentation system. It does not read data, write/create content, delete anything, or involve finances — it triggers a real-time playback control action.

From the tool's definition 'Skip backward in the specified layer by a given time' — triggers a transport/playback operation on an external system (ProPresenter 7)

Documented attack patterns abuse exactly the kind of access transport_skip_backward gives an agent:

POLICY

How to control transport_skip_backward

PolicyLayer is an MCP gateway — it sits between your AI agents and Propresenter, and nothing reaches the server without passing your rules. This is the rule we recommend for transport_skip_backward:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "transport_skip_backward": {
      "limits": [
        {
          "counter": "transport_skip_backward_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

transport_skip_backward 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.

Create a free account and register Propresenter — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 177 Propresenter tools →

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Go deeper

High-risk tools in Propresenter → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about transport_skip_backward

What does the transport_skip_backward tool do? +

Skip backward in the specified layer by a given time. It is categorised as a Execute tool in the Propresenter MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on transport_skip_backward? +

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

What risk level is transport_skip_backward? +

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

Can I rate-limit transport_skip_backward? +

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

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

transport_skip_backward is provided by the Propresenter MCP server (@alxpark/propresenter-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Propresenter tool call.

Start from Propresenter, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →