auto_add_drain_holes · Formlabs Local MCP: Risk & Policy

WHAT IT DOES

What auto_add_drain_holes does on Formlabs Local

AI agents use auto_add_drain_holes 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_add_drain_holes needs a policy

This tool creates or modifies 3D model data by automatically adding drain holes, which is a reversible change to model files. While it alters data, the operation is not destructive (can be undone by re-processing the original file) and does not delete or remove models.

From the tool's definition Tool name 'auto_add_drain_holes' indicates modification of 3D print files by adding drain holes to models. Sibling tool 'add_drain_holes' and server context (Formlabs 3D printer control) confirm this modifies model geometry.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

auto_add_drain_holes Rate-limited

auto_add_drain_holes 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_add_drain_holes": {
      "limits": [
        {
          "counter": "auto_add_drain_holes_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_add_drain_holes

What does the auto_add_drain_holes tool do? +

auto_add_drain_holes. 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_add_drain_holes? +

Register the Formlabs Local MCP server in PolicyLayer and add a rule for auto_add_drain_holes: 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_add_drain_holes? +

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

Can I rate-limit auto_add_drain_holes? +

Yes. Add a rate_limit block to the auto_add_drain_holes 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_add_drain_holes completely? +

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

auto_add_drain_holes 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.