Kundali — Vedic Astrology MCP server

An MCP server that exposes a person's Vedic (Jyotish) horoscope as raw, structured chart data — so an LLM can read the chart and do the interpretation itself, advising on the present situation.

Everything is computed locally with Swiss Ephemeris (jyotish.py): no scraping, works offline. The only network call is optional place geocoding (OpenStreetMap). Calculations use the sidereal zodiac, Lahiri ayanamsa, mean lunar node, and whole-sign houses — validated against a reference chart to within arc-minutes.

Design note: the tools return facts (positions, dignities, houses, dasha periods, transits, yogas), not predictions. The LLM supplies the interpretation — which makes readings conversational and tailored.

Setup

python -m venv .venv && source .venv/bin/activate
pip install -r requirements.txt
python mcp_server.py        # stdio transport

Register with Claude Code

claude mcp add kundali -- /path/to/kundali-app/.venv/bin/python \
  /path/to/kundali-app/mcp_server.py

Register with Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json (absolute paths):

{
  "mcpServers": {
    "kundali": {
      "command": "/path/to/kundali-app/.venv/bin/python",
      "args": ["/path/to/kundali-app/mcp_server.py"]
    }
  }
}

Tools

Tool	Returns (raw data)
geocode_place	City → candidate lat/lon + timezone (to confirm an ambiguous birthplace)
get_birth_chart	Ascendant, panchang, dasha balance, and a per-planet table: sign, exact degree, nakshatra+pada, retrograde, whole-sign house, dignity, aspected houses, + house-occupancy map
get_dashas	Vimshottari Maha → Antar → Pratyantar tree, lifetime Mahadasha timeline, with the periods running on as_of flagged
get_sade_sati	Transit Saturn vs natal Moon: house, Sade Sati/small-Panoti status, phase (Rising/Peak/Setting), Saturn's sign ingress/egress dates
get_current_transits	Each planet's transiting sign/degree/nakshatra/retro, with house from natal lagna and from natal Moon
get_yogas	Detected yogas with the placement rule that triggered each

Birth fields (same for every chart tool)

• name — person's name
• date — YYYY-MM-DD
• time — 24h local clock, HH:MM or HH:MM:SS
• place — birth city/town (geocoded if lat/lon omitted)
• sex — male / female
• latitude / longitude — optional decimal degrees (+N/+E) to override geocoding
• tz_offset — optional base (non-DST) UTC offset in hours, e.g. 5.5 for IST

get_dashas, get_sade_sati, get_current_transits also accept optional as_of (YYYY-MM-DD) to evaluate a past or future date (defaults to today).

Example prompt

"I was born on 1990-01-15 at 14:30 in Mumbai. Which dasha am I in, am I under Sade Sati, and what does my chart suggest about my career right now?"

The model calls get_birth_chart, get_dashas, get_sade_sati, get_current_transits, then interprets and advises.

These are traditional astrological interpretations, not deterministic predictions — the server's instructions tell the model to frame them as such.

Yoga coverage

Curated, each labelled with its rule: Gaja-Kesari, Budha-Aditya, Chandra-Mangala, the five Pancha Mahapurusha (Ruchaka/Bhadra/Hamsa/Malavya/ Sasa), Kemadruma, Kendra–Trikona Raj Yoga, Neecha-Bhanga (partial). Not exhaustive — absence isn't proof of absence.

Validation

Validated against an independent Vedic reference for a sample birth chart: every planet's sign/nakshatra/pada/retrograde/dignity/house matches; ascendant within ~20″, dasha balance within a few days, Sade Sati dates within a day, panchang exact.

Architecture

mcp_server.py   FastMCP tools + presentation (formats jyotish output)
jyotish.py      Swiss Ephemeris engine: positions, chart, panchang, dasha,
                sade sati, transits, yogas  (pure computation, no network)
geo.py          place -> coordinates + timezone (OpenStreetMap / timezonefinder)