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Microcap MCP server

by monoxide-xen·io.github.monoxide-xen/microcap-mcp·v0.1.1·2 stars
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Simulate, generate and draw analog circuits in Micro-Cap 12: SPICE analyses, sweeps and schematics

A88/100grade A
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Safety scan
A88/100

full report

Adoption
New

2 stars

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If you have run it, two minutes of your experience saves the next person an afternoon.

Microcap tools (20, 6 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • annotate_schematic

    Render the schematic as SVG with each labelled node's DC operating-point voltage written beside it — a marked-up drawing you can read the bias off.

  • describe_example

    Report what a reference circuit is set up to do, without running it.

  • draw_schematic

    Render a ``.CIR`` schematic as an SVG picture — the *drawing*, not a plot.

  • generate_amplifier

    Draw a ``.CIR`` op-amp amplifier with a near-ideal op-amp.

  • generate_cascode

    Draw a ``.CIR`` cascode amplifier (common-emitter under common-base).

  • generate_current_mirror

    Draw a ``.CIR`` BJT current mirror.

  • generate_differential_pair

    Draw a ``.CIR`` BJT long-tailed (differential) pair.

  • generate_emitter_follower

    Draw a ``.CIR`` emitter follower (common-collector BJT buffer).

  • generate_mosfet_amplifier

    Draw a ``.CIR`` common-source MOSFET gain stage (NMOS primitive).

  • generate_schematic

    Draw a ``.CIR`` schematic: a voltage source driving parts in series to ground, optionally with parallel branches from the output node to ground.

  • generate_transistor_amplifier

    Draw a ``.CIR`` common-emitter BJT gain stage (NPN primitive).

  • get_example

    Fetch one reference circuit's source text.

  • list_domains

    List the circuit-design domains Micro-Cap ships reference circuits for.

  • plotwrite action

    Run a netlist and return Micro-Cap's own rendered plot as a JPEG image.

  • plot_schematicwrite action

    Run a ``.CIR`` schematic and return Micro-Cap's rendered plot as a JPEG.

  • search_examples

    Search the ~470 reference circuits by name or domain.

  • simulatewrite action

    Run a SPICE netlist through Micro-Cap and return the waveform data.

  • simulate_examplewrite action

    Run one of Micro-Cap's own reference circuits and return its data.

  • simulate_schematicwrite action

    Run a Micro-Cap ``.CIR`` schematic and return its data.

  • sweepwrite action

    Run one netlist repeatedly, varying a ``.DEFINE`` parameter.

Public scan report

scanner v0.1.9 · 2026-09-24 · same rubric, same numbers if you re-run it

no findings
  • Code scan13 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitylocal package, no credentials required12/15
  • Maintenancelast push 60 days ago12/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
Overall 88/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Microcap compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
88/100
higher than 75% of 48,255 servers
Tools
20
the typical server has 7
Tools that change things
30%
typical: 0%. Fewer write tools means less an agent can break
GitHub stars
2
more than 75% of 28,688 servers

What its tools let an agent do: 6 read · 8 create · 6 change

Install Microcap in Claude Code, Cursor or VS Code

claude mcp add microcap-mcp -- uvx microcap-mcp
Add to Cursor

What the publisher says

From the Microcap repository's README, as published. We do not edit it. Read it on GitHub

microcap-mcp

ИИ-агент строит, считает и рисует аналоговые схемы в Micro-Cap 12.

Русский · English

Схему нарисовал сам сервер (1:1 с Micro-Cap, с рабочей точкой) · график посчитал Micro-Cap

Работает через штатный batch-режим Micro-Cap (MC12 @batch.bat) — headless, без GUI-автоматизации и без модификации программы.

Что делает

🔧 Строит схемы с нуля — 8 генераторов каскадов (общий эмиттер, повторитель, MOSFET, дифпара, токовое зеркало, каскод, ОУ, RLC) с авто-смещением. Каждый сверен с теорией: усиление, рабочая точка, резонанс.

📊 Считает — transient / AC / DC / искажения / устойчивость, рабочая точка, свипы. Комплексный вывод как {re, im}, диагностика солвера.

🎨 Рисует — сам рендерит .CIR в SVG 1:1 с Micro-Cap: родные символы из библиотеки MC, сетка, все повороты и отражения, раскладка подписей. Накладывает напряжения рабочей точки. /IC в batch-режиме MC этого не умеет — а сервер умеет.

Установка

Нужен Windows, Python 3.11+ и установленный Micro-Cap 12 (фримварь). Клонировать ничего не надо — укажи в MCP-клиенте, и uvx сам скачает пакет:

{
  "mcpServers": {
    "microcap": {
      "command": "uvx",
      "args": ["microcap-mcp"],
      "env": { "MICROCAP_HOME": "E:/Tools/MC12" }   // только если автопоиск не нашёл
    }
  }
}

Драйвер сам ищет Micro-Cap в типовых местах; MICROCAPHOME укажи на папку с mc1264.exe, если он лежит нестандартно.

Из исходников

git clone https://github.com/monoxide-xen/microcap-mcp
cd microcap-mcp
uv sync
{
  "mcpServers": {
    "microcap": {
      "command": "uv",
      "args": ["--directory", "C:/path/to/microcap-mcp", "run", "microcap-mcp"]
    }
  }
}

Инструменты

Плюс ресурсы microcap://guide и microcap://domains и промпт analyse_circuit — чтобы агент не дал MC молча соврать.

Тесты

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Microcap: common questions

Is Microcap MCP server safe?
Yes, by our scan: it is graded A (88/100). Read the Microcap safety report
How do I install Microcap?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Microcap need an API key?
No secret keys are declared. It reads 1 setting from the environment.
Is Microcap maintained?
The last commit was 101 days ago (2026-07-26). The latest release is v0.1.1.
How does Microcap compare with other MCP servers?
safety score 88/100 (higher than 75% of 48,255 servers); tools 20 (the typical server has 7); tools that change things 30% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.