Generate deterministic .plt settings for a named preset.
AI agents use generatePlotPresetSettings to create or update resources in Ltspice — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Ltspice environment.
This tool creates or writes configuration settings for LTspice plot presets. While the act of generating settings is reversible (they can be overwritten or deleted later), the tool itself performs a write operation that modifies the state of the system by creating new .plt preset configuration. This is a classic Write operation.
From the tool's definition Tool name and description indicate it 'Generate[s]' settings, which creates or modifies configuration data (a .plt file). The description does not indicate deletion or irreversible action, but does involve creating/writing deterministic plot preset settings.
Documented attack patterns abuse exactly the kind of access generatePlotPresetSettings gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Ltspice, and nothing reaches the server without passing your rules. This is the rule we recommend for generatePlotPresetSettings:
{
"version": "1",
"default": "deny",
"tools": {
"generatePlotPresetSettings": {
"limits": [
{
"counter": "generateplotpresetsettings_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}generatePlotPresetSettings 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.
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Generate deterministic .plt settings for a named preset. It is categorised as a Write tool in the Ltspice MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Ltspice MCP server in PolicyLayer and add a rule for generatePlotPresetSettings: 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 Ltspice. Nothing to install.
generatePlotPresetSettings is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the generatePlotPresetSettings 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.
Set action: deny in the PolicyLayer policy for generatePlotPresetSettings. 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.
generatePlotPresetSettings is provided by the Ltspice MCP server (xuio/ltspice-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Ltspice, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
71 Ltspice tools catalogued and risk-classified — across an index of 43,000+ MCP servers.