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Stellara MCP server

online · 100% uptime
by natlex.it·it.natlex/stellara-mcp·v0.2.2
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Swiss Ephemeris for AI agents: exact natal charts, transits, synastry and birth-place resolution

A98/100grade A
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Safety scan
A98/100

full report

Adoption
Growing

0 stars55 downloads/wk

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

Stellara tools

Tool list not cached yet. `describe` through the gateway fetches it live.

Public scan report

scanner v0.1.10 · 2026-10-02 · same rubric, same numbers if you re-run it

no findings
  • Code scan12 source files scanned25/25
  • Live reliabilityremote reachable in 192ms (auth required)20/20
  • –Tool poisoningtools not inspected (endpoint requires auth); not countedn/a
  • Auth qualityOAuth resource metadata advertised on 40115/15
  • Maintenancelast push 14 days ago15/15
  • Maintainer identityendpoint served from the registry-verified namespace domain8/10
Overall 98/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Stellara compares

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

Safety score
98/100
higher than 99% of 48,255 servers
Uptime
100%
of our recent checks; the typical remote server answers 100%
Response time
248 ms
faster than 56% of 30,031 servers
Downloads a week
55
more than 46% of 12,191 servers with a package

Release history: 2 versions in the registry since 2026-09-17, latest 2026-09-18, typically one every 1 day.

Install Stellara in Claude Code, Cursor or VS Code

claude mcp add --transport http stellara-mcp https://mcp.stellara.natlex.it/mcp
Add to Cursor

What the publisher says

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

Stellara MCP: Deterministic Swiss Ephemeris for AI Agents (Hermes, Claude, Grok)

Give your AI agent a real astronomical calculator. stellara-mcp is a tiny, open-source Model Context Protocol server that turns any MCP-capable agent — Claude.ai / Claude Desktop / Claude Code, ChatGPT, Codex, Cursor, Windsurf, Gemini CLI, Grok, Hermes — into an astrologer that never invents a planetary position. Connect by URL (no install) or run the package locally with an API key.

It exposes four tools backed by Swiss Ephemeris (the same engine professional astrologers use) running in the Stellara cloud:

Plus two MCP prompts: collectbirthprofile, a guided intake of the data every reading depends on (date → time with certainty → place → optional city, name, gender → confirmation card with age), and astrologersystemprompt, which switches the agent into a disciplined professional-astrologer style for interpreting that JSON.

The server does not interpret and does not call any LLM. It is a proxy adapter: numbers in, numbers out. Your agent does the reading; Swiss Ephemeris does the math.

Why this exists: LLMs lie about natal charts

Ask a language model "where was my Moon on 17 May 1990 at 14:30 in Warsaw?" and it will answer confidently — and, more often than not, wrongly. Ecliptic longitudes, house cusps and aspect orbs are the output of numerical integration of planetary motion plus spherical trigonometry for the local horizon. That is not something a next-token predictor can do in its head. Typical failure modes:

  • the Moon (13° per day) lands in the wrong sign;
  • the Ascendant is guessed from the Sun sign, ignoring time and latitude;
  • house cusps are fabricated or silently assume Equal houses;
  • "Saturn square Sun" is asserted with no orb, or with an orb that does not exist;
  • retrograde status is invented.

Every one of those errors poisons the whole interpretation that follows. A reading built on a wrong Ascendant is worthless no matter how eloquent it is.

stellara-mcp fixes this at the root. The agent calls a tool; the tool returns Swiss-Ephemeris-grade positions (sub-arcsecond precision, tropical zodiac, ten house systems, exact orbs, applying/separating derived from real planetary speeds); the agent interprets only that data. Deterministic senses, deterministic calculator — the language model is left to do what it is actually good at.

Quick start (1-click configs)

Two ways to connect:

Shortened. The full README is on GitHub.

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

Grade history

  • 2026-09-19restoreC → Ascore 96

Stellara: common questions

Is Stellara MCP server safe?
Yes, by our scan: it is graded A (98/100). Read the Stellara safety report
How do I install Stellara?
It runs remotely at mcp.stellara.natlex.it. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Stellara need an API key?
No key to paste: it signs you in with OAuth when your client connects.
Is Stellara maintained?
The last commit was 46 days ago (2026-09-19). The latest release is v0.2.2.
Is Stellara up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
How does Stellara compare with other MCP servers?
safety score 98/100 (higher than 99% of 48,255 servers); uptime 100% (of our recent checks; the typical remote server answers 100%); response time 248 ms (faster than 56% of 30,031 servers). Full comparison.