Jarroba Tools · Calculation

Name: Jarroba Tools · Calculation
Author: Invarato

作者：Invarato版本 0.3.0i★ –i在你的电脑上运行

注册名称io.github.Invarato/jarroba-tools-calc

安装

概览

作者提供的说明（英文原文）

Maths a model gets wrong: units with dimensional checking, equations, sheets. 5 tools, local.

PopNx MCP 的三大支柱

这三项永远不会合并成一个分数：意见、测量和人气是不同的东西。

用户评价i暂无评价评价功能将在后续阶段与账户功能一起开放
我们的基础检查i1 项中通过 1 项依据公开信息检查；尚未扫描代码
使用情况i非常新↓ 87/周 · ★ –

它能帮你做什么

我们还没有为它写通俗的介绍。下面是我们从注册中心读取到的事实。

连接方式: 在你的电脑上运行
传输方式: stdio
分类: 其他

安装

选择你使用的 AI 应用，然后复制设置。

安装之前

基础检查：1 项中通过 1 项
在你的电脑上运行，拥有你的用户账户的权限（文件、网络、应用）。
需要你自己填写： JARROBA_MCP_DOMAINS

你需要

npm已安装 Node.js（用于 npx 命令）

你用的是哪个应用？

ClaudeClaude CodeCursorVS CodeChatGPT

在上方选择你的应用。我们会记住它，下次按钮会显示“安装到 …”。

打开 Claude Desktop → Settings → Developer → Edit Config，把下面的内容粘贴到 claude_desktop_config.json

{
  "mcpServers": {
    "jarroba-tools-calc": {
      "command": "npx",
      "args": [
        "-y",
        "@jarroba/mcp-calc"
      ],
      "env": {
        "JARROBA_MCP_DOMAINS": "your-value"
      }
    }
  }
}

在终端中运行这条命令

claude mcp add jarroba-tools-calc --env JARROBA_MCP_DOMAINS=your-value -- npx -y @jarroba/mcp-calc

运行前请先填写空着的值。

在 Cursor 中打开

或者自己复制设置

粘贴到项目中的 .cursor/mcp.json，或 ~/.cursor/mcp.json

{
  "mcpServers": {
    "jarroba-tools-calc": {
      "command": "npx",
      "args": [
        "-y",
        "@jarroba/mcp-calc"
      ],
      "env": {
        "JARROBA_MCP_DOMAINS": "your-value"
      }
    }
  }
}

浏览器会先询问是否打开应用，然后应用会显示设置并请你确认。密钥的值会留空，由你自己填写。

在 VS Code 中打开

或者自己复制设置

粘贴到项目中的 .vscode/mcp.json

{
  "servers": {
    "jarroba-tools-calc": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@jarroba/mcp-calc"
      ],
      "env": {
        "JARROBA_MCP_DOMAINS": "your-value"
      }
    }
  }
}

浏览器会先询问是否打开应用，然后应用会显示设置并请你确认。密钥的值会留空，由你自己填写。

这个服务器在你的电脑上运行，而 ChatGPT 只能连接互联网上的服务器。请选择其他应用。

你的选择通过 Cookie 保存在这台设备上，无需账户。

需要你填写的值

JARROBA_MCP_DOMAINS env
Which tool domains to publish, comma-separated. Defaults to what this package is for. Valid: core, calc, diagram, kg, db, ai, logs, queue, project, tests, api, chip, chem, access, archsim, security,…

这些设置是根据作者在注册中心的条目生成的。如果 README 的写法不同，请以 README 为准。

它能做什么

它在你的电脑上运行；安装后，工具列表会显示在你的 AI 应用中。

基础检查i

我们检查的是任何人都能看到的信息；我们没有阅读代码。不适用的检查项不计入总数。 · 检查于 2026年11月8日

✓ 通过
作者与仓库一致
注册名称已通过 GitHub 账户 Invarato 验证，该账户拥有此仓库
… 尚未检查
仍在维护
我们还没有从 GitHub 读取这个仓库
… 尚未检查
有许可证
我们还没有从 GitHub 读取这个仓库
– 不适用
端点有响应
它在你的电脑上运行，没有互联网端点
– 不适用
使用 OAuth 登录
在你的电脑上运行，改用本地设置
… 尚未检查
工具描述中没有隐藏指令
它在你的电脑上运行；我们只能读取互联网端点的工具列表

与“其他”中的其他服务器比较i

星标数多于此分类中其他 18474 个服务器的 0%
发布到注册中心的时间比此分类中其他 18474 个服务器的 76% 更新
基础检查结果等于或优于此分类中其他 18474 个服务器的 100%

与注册中心里这个分类中所有活跃的服务器比较。只有当发布者拥有该仓库时，星标数才计入。

常见问题

Jarroba Tools · Calculation 安全吗？

它在 1 项适用的基础检查中通过了 1 项。我们没有阅读代码。在添加密钥或令牌之前，请先看看这个服务器要求哪些权限，并使用只具备所需权限的密钥。

它需要哪些密钥或代码？

注册中心没有列出必需的密钥，不过有些服务器会在首次使用时要求你登录。

它在我的电脑上运行还是在云端？

它在你的电脑上运行。你的 AI 应用会在需要时启动它，数据不会经过作者的服务器（除非它自己调用在线服务）。

它还在维护吗？

GitHub 仓库最后更新于–，最新版本（0.3.0）于12天前进入注册中心。

哪些应用可以使用它？

支持 MCP 的应用，例如 Claude Desktop、Claude Code、Cursor 和 VS Code。你的电脑上还需要有 Node.js。

有什么可以替代它？

同一分类中有：Spec Driven Development, Remote Desktop Commander, SwarmMemo

替代选择

同一分类中其他作者的服务器，按星标数排序。

如何看卡片：↓ 每周下载量i★ GitHub 星标i三大支柱：评价 · 检查 · 使用情况i更新 = 最新版本发布到注册中心的时间i

Spec Driven Development

MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.

作者：formulahendry起步阶段↓ 66/周★ 44014个月前更新

在你的电脑上运行

安装

Remote Desktop Commander

Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.

作者：desktop-commander正在增长★ 2113天前更新

在云端运行✓ desktopcommander.app

安装

SwarmMemo

Talk with agent swarms: rooms, private messages and paid tasks for AI agents

作者：Hugo0非常新今天更新

在云端运行✓ swarmmemo.com

安装

作者的 README

打开 README

按原文从作者的仓库复制。PopNx MCP 没有审查或背书其内容。HTML、图片和脚本已被移除。链接会离开本站。

@jarroba/mcp-calc

**An MCP server for the maths a language model gets wrong — and, above all, for the ones it gets wrong *silently*.**

claude mcp add jarroba-calc -- npx -y @jarroba/mcp-calc

// Claude Desktop, Cursor, Cline, VS Code…

{ "mcpServers": { "jarroba-calc": { "command": "npx", "args": ["-y", "@jarroba/mcp-calc"] } } }

5 tools · ~1.6k tokens of context · stdio, runs on your machine · nothing is uploaded, no API key.

Why this exists

A model that gets 17 * 23 wrong is not the problem: that one is easy to catch. The problem is the answer that looks right.

`5 km + 300 m`. Not a hard sum — but is the answer 305, 5.3, or 5300? A dimensional slip produces a number, not an error, and the number travels into the next formula.
`x^3 - 1 = 0`. «x = 1» is *true*, and it is also only a third of the answer. A tool that stops there and says nothing teaches the caller that there was nothing else.
**9.8 m/s^2 * t^2 / 2.** Here m, s and t are all names of units *and* perfectly ordinary variable names. Read them wrong and you get a plausible quantity in the wrong dimension.

So every tool here reports how sure it is, not just what it found: exact or approximate, over which interval it searched, how many complex roots it is not showing, and which names it read as units. The one thing none of them will do is fill a gap with something plausible.

The tools


`calc_eval`	Arithmetic with units and dimensional checking: `100 km/h to m/s`, `5 km + 300 m`, `70 kg to lbs`, `det([[1,2],[3,4]])`. Adding metres to kilos is an error, not a silent number. Flags results that are not finite (NaN, ±∞), and says which names it read as units
`calc_solve`	One equation (`x^2 - 5x + 6 = 0`, `sin(x) = 0.5`) or a linear system, one equation per line. Says whether the answer is exact or approximate, over which interval it searched, the degree of the polynomial and how many complex roots are not shown. Never invents a root it did not find
`calc_sheet`	A multi-line calculation sheet with the result of every line. Variables carry downwards, units travel with the value, `#` starts a comment, `ans` is the previous result, and an error stays on its own line instead of killing the sheet. Declare currencies with `# @moneda USD = 1.08 EUR` — you supply the rate, so the sheet still computes the same thing next year. Optional Markdown table out
`calc_derive`	Exact symbolic derivatives that keep the units: `d/dx (3 m * x)` is `3 m`, not `3`. Higher orders, and can evaluate the result at a point. Refuses to answer «0» when the variable is not in the expression, because a correct zero for the wrong question is the worst answer there is
`calc_steps`	The worked steps, verified: a linear or quadratic equation, a derivative (naming the rule), or Gaussian elimination row by row. When it cannot explain a case it returns `covered: false` instead of writing a plausible derivation — which is the point, if a person is going to read it

What it will not do

No symbolic simplification. It was the obvious sixth tool and it was dropped after measuring: the engine leaves (x+1)^2 - (x-1)^2 untouched (it is 4x) and does not know sin²+cos²=1. A tool that hands back your own input under the label *"simplified"* is worse than no tool, because the caller cannot tell «already simplest» from «I could not do it».
No integrals, no limits, no inequalities. Not supported, and said so here rather than discovered at the wrong moment.
Steps beyond degree 2 for equations. calc_solve still answers exactly; what is missing is the explanation, and calc_steps says which cases it covers in every response.

Where it comes from

The engine is the same code that runs the calculator at jarroba.com/tools — pure TypeScript, ~200 unit tests, no server. This package is the whole catalogue filtered down to the calculation domain; if you want the other 95 tools (logs, tests, SQL, SPARQL, diagrams…), install @jarroba/mcp instead. You can also widen this one without switching packages: JARROBA_MCP_DOMAINS=calc,core.

MIT. Nothing here talks to the network. Source: github.com/Invarato/jarroba-mcp.