create_design · Funky Junction MCP: Risk & Policy

WHAT IT DOES

What create_design does on Funky Junction

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

WHY IT NEEDS A POLICY

Why create_design needs a policy

This tool creates/initializes a new design object in Qiskit Metal, which is a write operation (reversible creation of data structures). It does not execute arbitrary code, delete data irreversibly, or perform financial actions. Severity is medium because initializing a design could consume resources or overwrite an existing design session, but the action is reversible and localized to the design environment.

From the tool's definition Tool name 'create_design' and description 'Initialize the Qiskit Metal planar design and GUI' indicate creation of a new design artifact, which is a reversible write operation. The tool modifies the design environment state by initializing a new project.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_design Rate-limited

create_design 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_design": {
      "limits": [
        {
          "counter": "create_design_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 Funky Junction, so you can run agents against it safely.

FAQ

Questions about create_design

What does the create_design tool do? +

Initialize the Qiskit Metal planar design and GUI. It is categorised as a Write tool in the Funky Junction 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_design? +

Register the Funky Junction MCP server in PolicyLayer and add a rule for create_design: 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 Funky Junction. Nothing to install.

What risk level is create_design? +

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

Can I rate-limit create_design? +

Yes. Add a rate_limit block to the create_design 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_design completely? +

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

create_design is provided by the Funky Junction MCP server (paulgoldschmidt/qsim-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.