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Astrology/ephemeris MCP server: 9 chart tools — positions, houses, aspects, transits, electional.
About
Astrology/ephemeris MCP server: 9 chart tools — positions, houses, aspects, transits, electional.
Remote endpoints: streamable-http: https://www.ephemengine.com/api/mcp
Security Report
5.2
Moderate5.2Moderate RiskCaelus-MCP is a well-architected astrological ephemeris server with strong separation of concerns, proper input validation, and no authentication requirements (appropriate for its stateless computational purpose). The codebase demonstrates good security practices: comprehensive input schema validation using Zod, no hardcoded credentials, no dangerous patterns like eval or unsanitized subprocess calls, and careful handling of file paths. Minor code quality observations exist (broad catch blocks, optional resource loading that silently degrades) but do not represent security risks. Permissions are appropriate for a calculation engine that reads ephemeris data and performs astronomical computations. Supply chain analysis found 1 known vulnerability in dependencies (0 critical, 1 high severity). Package verification found 1 issue (1 critical, 0 high severity).
5 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
Astrological ephemeris monorepo. MIT, no Swiss Ephemeris code, no AGPL, no ephemeris files. Live at ephemengine.com.
Packages
| Path | npm | Description |
|---|---|---|
packages/caelus | caelus | TypeScript engine (~85 KB gzipped, zero deps) |
packages/caelus-mcp | caelus-mcp | MCP server: charts, transits, synastry, events, eclipses |
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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