AI agents use import_cad_file to create or update resources in Blender — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Blender environment.
Importing a CAD file is a Write operation—it loads external data and adds it to the Blender project, modifying the scene state reversibly. This is not Read (no mere retrieval), not Execute (no arbitrary code or external command execution), not Destructive (no data loss), and not Financial.
From the tool's definition Tool name 'import_cad_file' indicates importing external CAD file data into Blender, which creates/adds new geometric data to the 3D scene.
Documented attack patterns abuse exactly the kind of access import_cad_file gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Blender, and nothing reaches the server without passing your rules. This is the rule we recommend for import_cad_file:
{
"version": "1",
"default": "deny",
"tools": {
"import_cad_file": {
"limits": [
{
"counter": "import_cad_file_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}import_cad_file 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_cad_file. It is categorised as a Write tool in the Blender MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Blender MCP server in PolicyLayer and add a rule for import_cad_file: 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 Blender. Nothing to install.
import_cad_file 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_cad_file 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_cad_file. 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_cad_file is provided by the Blender MCP server (sandraschi/blender-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Blender, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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77 Blender tools catalogued and risk-classified — across an index of 43,000+ MCP servers.