AI agents use create_element to create or update resources in Excalidraw — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Excalidraw environment.
The tool creates new elements on a canvas, which is a reversible write operation. While the description is empty, the name and server context clearly indicate element creation/modification. Severity is medium because misuse could spam the canvas or create unwanted diagrams, but changes are reversible (elements can be deleted).
From the tool's definition Tool name 'create_element' indicates data creation. Server enables 'create and manipulate live visual diagrams' on Excalidraw canvas.
Documented attack patterns abuse exactly the kind of access create_element gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Excalidraw, and nothing reaches the server without passing your rules. This is the rule we recommend for create_element:
{
"version": "1",
"default": "deny",
"tools": {
"create_element": {
"limits": [
{
"counter": "create_element_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_element stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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create_element. It is categorised as a Write tool in the Excalidraw MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Excalidraw MCP server in PolicyLayer and add a rule for create_element: 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. Nothing to install.
create_element is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_element 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 create_element. 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.
create_element is provided by the Excalidraw MCP server (lesleslie/excalidraw-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Excalidraw, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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17 Excalidraw tools catalogued and risk-classified — across an index of 43,000+ MCP servers.