AI agents invoke audio_focus_playlist to trigger actions in Propresenter. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
Focusing a specific audio playlist triggers an external operation in ProPresenter 7, changing the active state of the presentation software. This is an action with side effects in an external system, going beyond a simple read but not creating/modifying persistent data in a reversible write sense.
From the tool's definition Focus a specific audio playlist
Documented attack patterns abuse exactly the kind of access audio_focus_playlist gives an agent:
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 audio_focus_playlist:
{
"version": "1",
"default": "deny",
"tools": {
"audio_focus_playlist": {
"limits": [
{
"counter": "audio_focus_playlist_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}audio_focus_playlist 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.
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Focus a specific audio playlist. 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.
Register the Propresenter MCP server in PolicyLayer and add a rule for audio_focus_playlist: 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.
audio_focus_playlist is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the audio_focus_playlist 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.
Set action: deny in the PolicyLayer policy for audio_focus_playlist. 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.
audio_focus_playlist 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.
Start from Propresenter, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
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