getLocalExtrema

THE RISK

Low Risk

Why getLocalExtrema needs a policy

This tool retrieves numerical analysis results from simulation data. It performs calculations on vectors to identify local extrema but does not create, modify, delete, or execute any external operations. There are no side effects on the system or the simulation state.

From the tool's definition Tool is described as 'Get local minima/maxima for vectors' — a data retrieval and analysis operation with no modification or side effects.

Documented attack patterns abuse exactly the kind of access getLocalExtrema gives an agent:

POLICY

How to control getLocalExtrema

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 getLocalExtrema:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "getLocalExtrema": {}
  }
}

getLocalExtrema is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Ltspice — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Ltspice tools

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Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about getLocalExtrema

What does the getLocalExtrema tool do? +

Get local minima/maxima for vectors. It is categorised as a Read tool in the Ltspice MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on getLocalExtrema? +

Register the Ltspice MCP server in PolicyLayer and add a rule for getLocalExtrema: 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.

What risk level is getLocalExtrema? +

getLocalExtrema is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit getLocalExtrema? +

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

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

getLocalExtrema 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.

Enforce policy on every Ltspice tool call.

Start from Ltspice, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →