saveScene · Maige 3d MCP: Risk & Policy

WHAT IT DOES

What saveScene does on Maige 3d

AI agents use saveScene to create or update resources in Maige 3d — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Maige 3d environment.

WHY IT NEEDS A POLICY

Why saveScene needs a policy

This tool creates or modifies files on disk (a JSON scene file), which falls under Write category. It's not Read (no data retrieval), not Execute (no arbitrary code execution), not Destructive (the file can be overwritten or deleted), and not Financial.

From the tool's definition The tool name is 'saveScene' and the description states it 'Save[s] the current scene to a JSON file in the scenes/ folder.' This involves creating/writing data to a file system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

saveScene Rate-limited

saveScene 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "saveScene": {
      "limits": [
        {
          "counter": "savescene_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Maige 3d, so you can run agents against it safely.

FAQ

Questions about saveScene

What does the saveScene tool do? +

Save the current scene to a JSON file in the scenes/ folder. Returns the file path. It is categorised as a Write tool in the Maige 3d MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on saveScene? +

Register the Maige 3d MCP server in PolicyLayer and add a rule for saveScene: 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 Maige 3d. Nothing to install.

What risk level is saveScene? +

saveScene is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit saveScene? +

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

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

saveScene is provided by the Maige 3d MCP server (m-ai-gexr/mcp-webgpu). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.