create_rack · Synthlab MCP: Risk & Policy

WHAT IT DOES

What create_rack does on Synthlab

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

WHY IT NEEDS A POLICY

Why create_rack needs a policy

This tool creates new Pd patch configurations and rack setups from natural language input. While it produces new digital artifacts (patches), these are reversibly stored data structures that can be modified or deleted. There is no execution of audio synthesis, no deletion of existing data, and no financial impact. The primary function is creating/generating new patch data, making it a Write operation.

From the tool's definition Tool description states "Generate an entire Eurorack-style rack of Pd patches at once" - the verb 'generate' combined with 'create_rack' name indicates creation of new configuration/patch data.

Risk signalsBulk/mass operation — affects multiple targets

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_rack Rate-limited

create_rack 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": {
    "create_rack": {
      "limits": [
        {
          "counter": "create_rack_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 Synthlab, so you can run agents against it safely.

FAQ

Questions about create_rack

What does the create_rack tool do? +

Generate an entire Eurorack-style rack of Pd patches at once. It is categorised as a Write tool in the Synthlab MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_rack? +

Register the Synthlab MCP server in PolicyLayer and add a rule for create_rack: 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 Synthlab. Nothing to install.

What risk level is create_rack? +

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

Can I rate-limit create_rack? +

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

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

create_rack is provided by the Synthlab MCP server (j0kz/synthlab-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.