spicelib-mcp

MCP serverCommunity

A thin wrapper over spicelib with four tools for AC, transient, DC operating point and parameter sweeps in ngspice, LTspice or Qspice. By Lucas Gerads.

8 starsUpdated 7 months agoGitHub data from 5 Nov 2026

At a glance

Type: MCP server
Works with: ngspice, LTspice
How it connects: Drives a running copy of the tool
Access: Read-only
Tool versions: ngspice (default), LTspice or Qspice selected with SPICE_SIMULATOR
Operating systems: Not stated in its documentation
Needs a ngspice licence: No
Transport: Local (stdio)
AI clients documented: Claude Code
Licence: GPL-3.0
Language: Python

What it can do

Runs AC sweeps, transient analyses and DC operating points on a netlist you provide.
Runs several simulations in parallel while sweeping component values.
Saves results as .npz files next to the netlist for later plotting and comparison with measurements, which suits behavioural model fitting.

Limitations

Four tools only; it doesn't edit schematics or return named measurements.
The simulator must be installed and on PATH, or set with SPICE_PATH.

Install

{
  "mcpServers": {
    "spicelib": {
      "type": "stdio",
      "command": "uvx",
      "args": ["spicelib-mcp"],
      "env": {
        "SPICE_SIMULATOR": "ngspice"
      }
    }
  }
}

Source: github.com/lucasgerads/spicelib-mcp

MCP servers and skills run code on your computer. Review the source before installing.

AI-generated models, drawings and results must be checked by a qualified engineer before use.