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.
This tool creates new elements on an Excalidraw canvas, which is a reversible modification of the diagram state. It does not execute arbitrary code or delete data, making it a Write operation rather than Execute or Destructive. The severity is medium because a malicious agent could spam the canvas with unwanted elements or create confusing diagrams, but the effects are reversible via the delete_element tool.
From the tool's definition Tool name 'create_element' and description 'Create a new Excalidraw element' explicitly indicate a CREATE operation that adds new data to the canvas. The tool modifies the diagram reversibly by adding elements.
Attacks that exploit this kind of access
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 (kakacoding1/mcp_excalidraw). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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