Import elements from a .excalidraw JSON file or raw JSON data
AI agents use import_scene 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 import_scene tool modifies the Excalidraw diagram by adding elements from external sources. This is a Write operation because it creates/adds data to the canvas. It is reversible (imported elements can be deleted or the import undone).
From the tool's definition Tool description states 'Import elements from a .excalidraw JSON file or raw JSON data' - this operation creates or adds data to the diagram by importing external elements, modifying the canvas state reversibly.
Documented attack patterns abuse exactly the kind of access import_scene 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 import_scene:
{
"version": "1",
"default": "deny",
"tools": {
"import_scene": {
"limits": [
{
"counter": "import_scene_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}import_scene 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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Import elements from a .excalidraw JSON file or raw JSON data. 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 import_scene: 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.
import_scene 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 import_scene 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 import_scene. 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.
import_scene 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.