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34-tool Caelus MCP for validated astrology: charts, transits, Vedic, facts, sky view, synthetic.
About
34-tool Caelus MCP for validated astrology: charts, transits, Vedic, facts, sky view, synthetic.
Remote endpoints: streamable-http: https://www.ephemengine.com/api/mcp
Security Report
4.8
Use Caution4.8High RiskCaelus MCP is a well-architected astrology computation server with strong code quality and appropriate security practices. The server performs mathematical calculations on astronomical/astrological data with no external API dependencies, network calls, or credential handling. Permissions align well with the stated purpose. Minor code quality observations exist but do not materially impact security. Supply chain analysis found 1 known vulnerability in dependencies (0 critical, 1 high severity). Package verification found 1 issue (1 critical, 0 high severity).
4 files analyzed · 6 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
Unverified package source
We couldn't verify that the installable package matches the reviewed source code. Proceed with caution.
How to Install & Connect
Available as Local & Remote
This plugin can run on your machine or connect to a hosted endpoint. during install.
Documentation
View on GitHubFrom the project's GitHub README.
Caelus
Clean-room astrology computation monorepo. MIT, no Swiss Ephemeris code, no AGPL, no ephemeris files. Caelus computes ephemeris positions, charts, events, hellenistic timing techniques, Vedic methods, citable chart facts, sky-view image-prompt frames, and the MCP tools around them. Live at ephemengine.com.
Packages
| Path | npm | Description |
|---|---|---|
packages/caelus | caelus | TypeScript engine (~97 KB gzipped, zero deps) |
packages/caelus-mcp | caelus-mcp | MCP server: charts, transits, synastry, events, eclipses |
packages/caelus-delineations-pd | — | Public-domain interpretation corpus + default validation set for interpret() |
packages/birth | caelus-birth | Birth time + place → UT (timezone and DST resolution) |
packages/wheel | caelus-wheel | React SVG chart wheel, zero runtime deps |
apps/web | — | Next.js site: playground, validation, edge /api/chart |
caelus-starter | — | Next.js starter app (separate repo) |
The Python reference engine and data-fitting pipeline live in python/;
they mint the coefficient data and golden fixtures and are not a runtime
dependency.
Docs
- ARCHITECTURE.md — layout, durability decisions, product strategy
- MCP_SPEC.md — MCP tool contract
- docs/gap-analysis.md — Swiss Ephemeris comparison (closed at 0.5.0)
- docs/agents.md — pitfalls for coding agents building on Caelus
- docs/releasing.md — release process
Quick start
npm install
npm run build
npm test
npm run dev -w web
http://localhost:3000 — live chart in the browser.
Edge API: GET /api/chart?date=…&lat=…&lon=….
Branches
main— stable releasesdev— active development
Reviews
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