clear_layer
Clear a specific layer (audio, props, messages, announcements, slide, media, video_input)
This record as markdown: /tools/io-github-alxpark-propresenter-mcp/clear-layer.md
What clear_layer does on Propresenter
AI agents call clear_layer to permanently remove resources in Propresenter, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Why clear_layer is rated Critical
Clearing a layer in a live presentation system like ProPresenter removes active content from display or playback immediately. This action is not simply a write/update but an irreversible removal of the live state of that layer (e.g., clearing the slide layer removes what is currently shown on screen). In a live production context, this could disrupt an ongoing service or event and cannot be easily undone.
From the tool's definition "Clear a specific layer" — clearing a layer removes/wipes the currently active content from that layer (audio, props, messages, announcements, slide, media, video_input)
Attacks that exploit this kind of access
The rule that runs clear_layer safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Propresenter, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For clear_layer, this is the rule to start with:
clear_layer is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.
The button opens the PolicyLayer dashboard: create your workspace, connect Propresenter, apply this rule, and every clear_layer call is checked against it from then on.
Questions about clear_layer
Clear a specific layer (audio, props, messages, announcements, slide, media, video_input). It is categorised as a Destructive tool in the Propresenter MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Propresenter MCP server in PolicyLayer and add a rule for clear_layer: 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.
clear_layer is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the clear_layer 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 clear_layer. 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.
clear_layer 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.
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