mcp-ltspice-qucs¶

A three-server Model Context Protocol (MCP) suite that turns RF filter design and multi-radio coexistence engineering into a fluent agent workflow. Use LTspice and Qucs-S through domain-aware abstractions ("place a transmission zero at 1853 MHz", "evaluate against this coex spec") instead of SPICE primitives.

Why this exists¶

Designing a single coexistence-aware filter today looks like: hours in LTspice nudging component values, swapping vendor SPICE models by hand, re-running the sim, eyeballing the S21 trace, repeat. This suite codifies the workflow so an LLM agent can iterate at the design intent layer, collapsing each iteration from minutes to seconds while keeping a human engineer in the loop for judgment calls.

The three servers¶

Server	Purpose	Tools
`mcp-ltspice`	LTspice (Wine) + ngspice fallback, CircuitDocument import/export, durable jobs/artifacts, model-aware generic optimization, filter synthesis, S-parameter extraction, Monte Carlo	76
`mcp-qucs-s`	Qucs schematic/netlist import/export, durable simulation jobs, native S-parameters/noise, Xyce harmonic balance, microstrip + distributed-element synthesis	29
`mcp-rf-analysis`	Simulator-agnostic skrf wrappers/readiness probing, LTE/5G NR/GNSS/ISM/HaLow band databases, FCC/ETSI/3GPP spec evaluation, multi-radio coex matrix	35

All three speak Touchstone (.s2p / .snp) as the cross-tool exchange format and return a uniform response envelope.

Headline demo¶

The basic LPF example synthesizes a 5th-order Butterworth low-pass filter at 1 GHz, snaps values to Coilcraft 0402HP + Murata GJM C0G catalogs, and runs a 1000-trial analytical Monte Carlo at 5% component tolerance. The analytical preview passes all 5 criteria with 99% yield; vendor parasitics are not applied in that calculation.

Basic LPF response

Quickstart¶

git clone https://github.com/RFingAdam/mcp-ltspice-qucs
cd mcp-ltspice-qucs
uv sync
uv run python examples/basic_lpf/design.py

See Installation for ngspice / LTspice / Qucs-S setup.

License¶

AGPL-3.0-or-later. See LICENSE.