auto_support · Formlabs Local MCP: Risk & Policy

WHAT IT DOES

What auto_support does on Formlabs Local

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

WHY IT NEEDS A POLICY

Why auto_support needs a policy

This tool generates (creates) support structures for a 3D print scene. It writes new data (support geometry) to the model/scene. It does not delete or irreversibly overwrite existing data, execute arbitrary code, or involve financial transactions. Misuse could result in incorrect support generation that wastes material or causes print failures, but the action is reversible (supports can be regenerated or removed).

From the tool's definition "Generate support structures" — creates new support structure data within a scene/model

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

auto_support Rate-limited

auto_support 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": {
    "auto_support": {
      "limits": [
        {
          "counter": "auto_support_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 Formlabs Local, so you can run agents against it safely.

FAQ

Questions about auto_support

What does the auto_support tool do? +

Generate support structures. It is categorised as a Write tool in the Formlabs Local MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on auto_support? +

Register the Formlabs Local MCP server in PolicyLayer and add a rule for auto_support: 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 Formlabs Local. Nothing to install.

What risk level is auto_support? +

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

Can I rate-limit auto_support? +

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

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

auto_support is provided by the Formlabs Local MCP server (mkebiclioglu/formlabs-local-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.