Create a new Excalidraw element. For arrows, use startElementId/endElementId to bind to shapes (auto-routes to edges).
AI agents use create_element to create or update resources in Excalidraw MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Excalidraw MCP Server environment.
The tool creates new diagram elements but does not execute external code, delete data irreversibly, move money, or trigger uncontrolled operations. It modifies the canvas state reversibly, fitting the Write category.
From the tool's definition Tool name 'create_element' and description 'Create a new Excalidraw element' indicates creation of new data within the diagram. This is reversible (elements can be deleted via delete_element tool on the same server).
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 MCP Server, 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 a new Excalidraw element. For arrows, use startElementId/endElementId to bind to shapes (auto-routes to edges). It is categorised as a Write tool in the Excalidraw MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Excalidraw MCP Server 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 MCP Server. 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 MCP server (yctimlin/mcp_excalidraw). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 26 Excalidraw MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
26 Excalidraw MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.