download_polyhaven_asset
AI agents use download_polyhaven_asset 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.
Based on the name, this tool likely downloads an asset from Polyhaven (a 3D asset library) and writes it to the local system or imports it into Blender. This constitutes a Write operation as it creates new files or data locally. Severity is medium due to potential for downloading unwanted or large files, but limited blast radius. Confidence is lowered because the description is empty.
From the tool's definition Tool name 'download_polyhaven_asset' — 'download' implies fetching and writing asset data to the local filesystem.
Documented attack patterns abuse exactly the kind of access download_polyhaven_asset 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 download_polyhaven_asset:
{
"version": "1",
"default": "deny",
"tools": {
"download_polyhaven_asset": {
"limits": [
{
"counter": "download_polyhaven_asset_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}download_polyhaven_asset 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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download_polyhaven_asset. 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 download_polyhaven_asset: 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.
download_polyhaven_asset 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 download_polyhaven_asset 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 download_polyhaven_asset. 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.
download_polyhaven_asset is provided by the Blender MCP server (vertiiii/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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17 Blender tools catalogued and risk-classified — across an index of 43,000+ MCP servers.