Clear the entire canvas to white.
AI agents call clear_canvas to permanently remove resources in Paint MCP — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Clearing the entire canvas destroys all previously drawn content and replaces it with a blank white state. This action cannot be undone (no undo mechanism is mentioned), making it Destructive. The blast radius is medium since it only affects the in-memory drawing canvas rather than persistent files or systems, but all artistic work is permanently lost.
From the tool's definition 'Clear the entire canvas to white' — irreversibly wipes all existing artwork on the canvas
Risk signalsBulk/mass operation — affects multiple targets
Attacks that exploit this kind of access
Clear the entire canvas to white. It is categorised as a Destructive tool in the Paint MCP MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Paint 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 Paint MCP. 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 Paint MCP server (joeyballentine/paint-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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