save_form · Formlabs Local MCP: Risk & Policy

WHAT IT DOES

What save_form does on Formlabs Local

AI agents use save_form 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 save_form needs a policy

This tool performs a file write operation ('save'), which is reversible—the file can be edited, deleted, or overwritten later. It does not delete data (hence not Destructive), execute arbitrary code (hence not Execute), or move money (hence not Financial).

From the tool's definition The tool 'save_form' explicitly saves data (the current scene) to a file (.form file) at a specified path. This is a file write operation that creates or modifies files on the filesystem.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

save_form Rate-limited

save_form 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": {
    "save_form": {
      "limits": [
        {
          "counter": "save_form_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 save_form

What does the save_form tool do? +

Save the current scene to a .form file at the given absolute path. 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 save_form? +

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

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

Can I rate-limit save_form? +

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

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

save_form 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.