Close LTspice windows whose title contains title_hint.
AI agents invoke closeLtspiceWindow to trigger actions in Ltspice. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
Closing application windows is an external UI/OS operation that triggers an action in a running application. It's not purely destructive (no data deletion) but it executes an OS-level action affecting LTspice state. Unsaved work could be lost, raising severity to medium.
From the tool's definition 'Close LTspice windows whose title contains title_hint'
Documented attack patterns abuse exactly the kind of access closeLtspiceWindow 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 closeLtspiceWindow:
{
"version": "1",
"default": "deny",
"tools": {
"closeLtspiceWindow": {
"limits": [
{
"counter": "closeltspicewindow_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}closeLtspiceWindow stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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Close LTspice windows whose title contains title_hint. It is categorised as a Execute tool in the Ltspice MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Ltspice MCP server in PolicyLayer and add a rule for closeLtspiceWindow: 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.
closeLtspiceWindow is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the closeLtspiceWindow 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 closeLtspiceWindow. 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.
closeLtspiceWindow 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.
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