virtuoso_set_instance_property · Virtuoso Schematic MCP

WHAT IT DOES

What virtuoso_set_instance_property does on Virtuoso Schematic MCP

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

WHY IT NEEDS A POLICY

Why virtuoso_set_instance_property needs a policy

This tool creates or modifies data reversibly. It changes instance properties (width, length, resistance) which are design parameters that can be edited, undone, or reverted in Cadence Virtuoso. While it affects schematic design, it does not execute simulations, delete irreversible data, or trigger destructive operations.

From the tool's definition Tool description states 'Set a property on a component instance (e.g., width, length, resistance)' — this modifies component parameters in the schematic design.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

virtuoso_set_instance_property Rate-limited

virtuoso_set_instance_property 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": {
    "virtuoso_set_instance_property": {
      "limits": [
        {
          "counter": "virtuoso_set_instance_property_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 Virtuoso Schematic MCP, so you can run agents against it safely.

FAQ

Questions about virtuoso_set_instance_property

What does the virtuoso_set_instance_property tool do? +

Set a property on a component instance (e.g., width, length, resistance). It is categorised as a Write tool in the Virtuoso Schematic MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on virtuoso_set_instance_property? +

Register the Virtuoso Schematic MCP server in PolicyLayer and add a rule for virtuoso_set_instance_property: 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 Virtuoso Schematic MCP. Nothing to install.

What risk level is virtuoso_set_instance_property? +

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

Can I rate-limit virtuoso_set_instance_property? +

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

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

virtuoso_set_instance_property is provided by the Virtuoso Schematic MCP server (michelebergo/virtuoso-schematic-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.