SIDUS

Open-source space engineering tools
Pure SI · multilingual · agent-ready · non-profit

skills.sh Live site MIT License AI readiness Agent Skills format MCP TypeScript React 19

Install · Agent skill · MCP · Develop · Docs

SIDUS: open-source space engineering tools

SIDUS (sidus, Latin: constellation, heavenly body) is a free educational lab for orbital mechanics, propulsion, RF/ops, geometry, and ECLSS — in the browser and for AI agents.

No accounts. No GPU. No affiliation with any space agency or company. 100% open source · non-profit.

• ~175 pure-SI calculators — Hohmann, Lambert, SGP4, link budget, cabin atmosphere, rocket equation, and many more.
• Shared UI, zero duplication — every tool is ToolShell + shared field/result components.
• 10 languages — English, Italian, German, French, Spanish, Russian, Chinese, Japanese, Korean, Portuguese (space-agency coverage).
• Multi-language code export — C, C++, Rust, Zig, Python, JS/TS, MATLAB, Julia, Fortran, LaTeX.
• Agent-native — public MCP endpoint + Agent Skill (skills/sidus/SKILL.md).
• SEO & bots — llms.txt, sitemap, robots, dynamic Open Graph cards.

Educational models only — not flight software.

Open https://sidus.tools — no install.

SIDUS ships as an Agent Skill so coding agents can run the same pure-SI calculators:

npx skills add massimodeluisa/sidus-tools

The skill lives at skills/sidus/SKILL.md. Compatible with Claude Code, Codex, Cursor, OpenCode, and other Agent Skills clients.

Point any MCP client at the public endpoint — no clone, no npm install:

https://sidus.tools/api/mcp

{
 "mcpServers": {
 "sidus": {
 "url": "https://sidus.tools/api/mcp"
 }
 }
}

Optional offline stdio:

git clone https://github.com/massimodeluisa/sidus-tools.git
cd sidus-tools && npm install && npm run mcp

Full MCP docs: mcp/README.md.

Browser / agent
 │
 ├─► sidus.tools UI → ToolShell + catalog search/filters
 │ │
 │ └─► lib/physics → pure SI (no React, unit-tested)
 │
 ├─► /api/mcp → Streamable HTTP MCP (same math)
 │
 ├─► /api/og → ×ばつ630 brand cards (static + live)
 │
 └─► skills/sidus → Agent Skill instructions

src/
 components/shared/ ToolShell, fields, results
 components/tools/ One page per calculator
 components/site/ Header, footer, home, catalog
 lib/physics/ Pure SI models + golden cases
 lib/snippets/ Multi-lang code export
 lib/og/ OG payload / catalog
 data/ Tool catalog, sources, precision
 i18n/locales/ All UI strings
api/ Vercel handlers (MCP, OG)
mcp/ Shared MCP server (HTTP + stdio)
skills/sidus/ Agent Skill (SKILL.md)
public/ robots, sitemap, llms, logos, favicon

npm install
npm run dev # Vite dev server
npm run build # type-check + production build
npm run type-check
npm test
npm run llms:gen # regenerate public/llms.txt
npm run godbolt:matrix

1. Maximum reuse — shared chrome only; tools never re-invent inputs/results.
2. i18n everywhere — every user-facing string goes through t(...).
3. Pure physics — lib/physics/ has no React, no DOM, no side effects.
4. Idiomatic snippets — no free-function shims; each language feels native.
5. Theme tokens only — no raw hex in components.
6. Catalog hygiene — catalog/URL changes update sitemap.xml + llms:gen.
7. Educational honesty — models are for learning; not flight certification.

Public indexes: public/llms.txt · public/robots.txt · public/sitemap.xml

Homepage-dark cards (safe zone, large type, mono formula):

Details: docs/OG_IMAGES.md.

X GitHub

Massimo De Luisa: massimo.deluisa.bio

MIT, see LICENSE.

SIDUS is independent and has no affiliation with NASA, ESA, SpaceX, Roscosmos, CNSA, JAXA, ISRO, ASI, DLR, CNES, KARI, AEB, or any other agency or company.