assets_polyhaven_files

THE RISK

Low Risk

Why assets_polyhaven_files needs a policy

This tool retrieves metadata about 3D assets from PolyHaven—a read-only operation with no side effects, no code execution, no data modification, and no destructive capability. The action is a simple lookup/query of asset metadata. Blast radius is minimal as misuse would only result in retrieving unwanted asset information.

From the tool's definition Tool name 'assets_polyhaven_files' and description 'Get PolyHaven file metadata for a specific asset id' indicate a retrieval operation that queries file metadata without modification or execution.

Documented attack patterns abuse exactly the kind of access assets_polyhaven_files gives an agent:

POLICY

How to control assets_polyhaven_files

PolicyLayer is an MCP gateway — it sits between your AI agents and 8th Wall MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for assets_polyhaven_files:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "assets_polyhaven_files": {}
  }
}

assets_polyhaven_files is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register 8th Wall MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
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FAQ

Questions about assets_polyhaven_files

What does the assets_polyhaven_files tool do? +

Get PolyHaven file metadata for a specific asset id. It is categorised as a Read tool in the 8th Wall MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on assets_polyhaven_files? +

Register the 8th Wall MCP Server MCP server in PolicyLayer and add a rule for assets_polyhaven_files: 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 8th Wall MCP Server. Nothing to install.

What risk level is assets_polyhaven_files? +

assets_polyhaven_files is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit assets_polyhaven_files? +

Yes. Add a rate_limit block to the assets_polyhaven_files 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.

How do I block assets_polyhaven_files completely? +

Set action: deny in the PolicyLayer policy for assets_polyhaven_files. 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.

What MCP server provides assets_polyhaven_files? +

assets_polyhaven_files is provided by the 8th Wall MCP Server MCP server (superdwayne/8thwallmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every 8th Wall MCP Server tool call.

Start from 8th Wall MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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