export_thumbnail

THE RISK

Low Risk

Why export_thumbnail needs a policy

This tool captures and exports a visual snapshot of the 3D viewport. It reads/captures the current state of the viewport and produces an image file. While it writes a file to disk, its primary action is reading/capturing visual data with no destructive or significant side effects. Similar to a screenshot tool, the blast radius of misuse is minimal.

From the tool's definition Export a 3D viewport screenshot/thumbnail

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

POLICY

How to control export_thumbnail

PolicyLayer is an MCP gateway — it sits between your AI agents and CLO3D MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for export_thumbnail:

policy.json

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

export_thumbnail 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 CLO3D 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.

CAP THIS TOOL →

Free to start. No card required.

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.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about export_thumbnail

What does the export_thumbnail tool do? +

Export a 3D viewport screenshot/thumbnail. It is categorised as a Read tool in the CLO3D MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on export_thumbnail? +

Register the CLO3D MCP Server MCP server in PolicyLayer and add a rule for export_thumbnail: 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 CLO3D MCP Server. Nothing to install.

What risk level is export_thumbnail? +

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

Can I rate-limit export_thumbnail? +

Yes. Add a rate_limit block to the export_thumbnail 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 export_thumbnail completely? +

Set action: deny in the PolicyLayer policy for export_thumbnail. 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 export_thumbnail? +

export_thumbnail is provided by the CLO3D MCP Server MCP server (ubani-studio/clo3d-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every CLO3D MCP Server tool call.

Start from CLO3D MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →