List available schematic templates from the built-in or user-provided JSON file.
AI agents call listSchematicTemplates to retrieve information from Ltspice without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool merely enumerates or retrieves metadata about schematic templates from a configuration file. It does not create, modify, delete, or execute code. The blast radius of misuse is minimal — an agent cannot cause damage by listing templates.
From the tool's definition Tool name contains 'list' and description states it 'List available schematic templates' — a retrieval operation with no side effects. It queries and returns information about templates without modifying, deleting, or executing anything.
Documented attack patterns abuse exactly the kind of access listSchematicTemplates 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 listSchematicTemplates:
{
"version": "1",
"default": "deny",
"tools": {
"listSchematicTemplates": {}
}
}listSchematicTemplates is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List available schematic templates from the built-in or user-provided JSON file. It is categorised as a Read tool in the Ltspice MCP Server, which means it retrieves data without modifying state.
Register the Ltspice MCP server in PolicyLayer and add a rule for listSchematicTemplates: 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.
listSchematicTemplates is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the listSchematicTemplates 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 listSchematicTemplates. 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.
listSchematicTemplates 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.