props_clear

THE RISK

Critical Risk

Why props_clear needs a policy

This tool removes data (a prop) from active display in a presentation context. While potentially recoverable from saved files, the action itself on the active presentation state is destructive—it eliminates the prop's visibility and state without reversal through the tool's own mechanism.

From the tool's definition Tool name is 'props_clear' and description states 'Clear a specific prop from display'. The verb 'clear' in the context of presentation software means to remove or delete a prop from the current display, which is an irreversible action that cannot be undone…

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

POLICY

How to control props_clear

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 props_clear:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "props_clear"
  ]
}

props_clear disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

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.

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Propresenter tools

Destructive clear_layer Clear a specific layer (audio, props, messages, announcements, slide, media, video_input) Destructive messages_delete Delete a specific message Destructive props_delete Delete a specific prop Destructive props_delete_collection Delete a specific prop collection Destructive stage_delete_layout Delete a specific stage layout Execute clear_trigger_group Trigger a specific clear group Execute props_pause_auto_clear Pause auto-clear for a specific prop Execute timers_operation Perform a specific operation on a timer (start, stop, reset)

All 177 Propresenter tools →

Destructive tools on other servers

Android Forensics ADB MCP Server create_full_backup 0xarchive web3_revoke_key Frida Game Hacking MCP clear_scan cPanel MCP Server clear_spam_box

Go deeper

Critical-risk tools in Propresenter → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-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.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about props_clear

What does the props_clear tool do? +

Clear a specific prop from display. 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.

How do I enforce a policy on props_clear? +

Register the Propresenter MCP server in PolicyLayer and add a rule for props_clear: 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 props_clear? +

props_clear is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit props_clear? +

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

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

props_clear 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 →