Get the current pixel data of the drawing canvas as JSON.
Part of the Drawing Tool for AI Assistants server.
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AI agents call drawing_getCanvasData to retrieve information from Drawing Tool for AI Assistants without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though drawing_getCanvasData only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"drawing_getCanvasData": {}
}
}See the full Drawing Tool for AI Assistants policy for all 4 tools.
These attack patterns abuse exactly the kind of access drawing_getCanvasData gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Get the current pixel data of the drawing canvas as JSON.. It is categorised as a Read tool in the Drawing Tool for AI Assistants MCP Server, which means it retrieves data without modifying state.
Register the Drawing Tool for AI Assistants MCP server in PolicyLayer and add a rule for drawing_getCanvasData: 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 Drawing Tool for AI Assistants. Nothing to install.
drawing_getCanvasData is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the drawing_getCanvasData 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 drawing_getCanvasData. 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.
drawing_getCanvasData is provided by the Drawing Tool for AI Assistants MCP server (flrngel/mcp-painter). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 4 Drawing Tool for AI Assistants tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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