MCP Servers

spicelib-mcp

A thin MCP server that wraps spicelib for circuit simulation. Exposes tools for running AC, transient, DC op, and parameter sweep analyses, enabling behavioral model fitting through iterative simulation and measurement comparison.

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README

spicelib-mcp

A thin MCP server that wraps spicelib for circuit simulation. The heavy lifting, such as simulator invocation, .raw file parsing, and multi-simulator abstraction, is done by spicelib, which deserves most of the credit. This project is purely a transport layer that exposes spicelib's functionality as MCP tools for use with Claude Code (and other coding agents).

Primary use case: behavioral model fitting — run simulations, compare against real measurements, iterate on SPICE models.

Tools

run_ac_analysis — AC frequency sweep, returns magnitude/phase data
run_transient — transient simulation, returns time-domain waveforms
run_dc_op — DC operating point analysis
run_sweep — run multiple simulations in parallel, sweeping component values

Results are saved as .npz files alongside the netlist for further analysis and plotting.

Supported simulators

Simulator	`SPICE_SIMULATOR` value	Install
ngspice	`ngspice` (default)	`sudo apt install ngspice`
LTspice	`ltspice`	Download from Analog Devices
Qspice	`qspice`	Download from Qorvo

Set the SPICE_PATH environment variable to override the simulator binary location.

Setup

Copy .mcp.json.template to .mcp.json in your project directory and adjust SPICE_SIMULATOR if needed:

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

Requirements

Python 3.10+
A supported simulator installed and on PATH

License

GPL-3.0-or-later

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