Clear all elements from the canvas
AI agents call clear_canvas to permanently remove resources in Excalidraw MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
The tool permanently removes all elements from a user's canvas without the ability to recover them through the MCP interface. While the user retains Excalidraw's native undo functionality, from the MCP agent's perspective this is a destructive operation that irreversibly wipes the entire diagram state.
From the tool's definition Tool name 'clear_canvas' combined with description 'Clear all elements from the canvas' indicates irreversible deletion of all diagram content. This is a bulk delete operation that cannot be undone through normal MCP interactions.
Risk signalsBulk/mass operation — affects multiple targets
Attacks that exploit this kind of access
Clear all elements from the canvas. It is categorised as a Destructive tool in the Excalidraw MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Excalidraw MCP Server MCP server in PolicyLayer and add a rule for clear_canvas: 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 Excalidraw MCP Server. Nothing to install.
clear_canvas 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_canvas 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_canvas. 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_canvas is provided by the Excalidraw MCP Server MCP server (kakacoding1/mcp_excalidraw). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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