Astromock

A standalone MCP server that exposes Vedic astrology calculations as reusable tools. Any MCP client — Claude Desktop, a chatbot, the ASTRO-MOCK web app, or future projects — can consume these tools.

Calculations use the sidereal zodiac with Lahiri ayanamsha, Whole Sign houses and mean lunar nodes, powered by the Swiss Ephemeris (pyswisseph, built-in Moshier ephemeris — no extra data files needed).

Available tools

calculate_kundali

Calculates the D-1 (Rashi) birth chart. Returns the ascendant (lagna) and all nine grahas (Sun, Moon, Mars, Mercury, Jupiter, Venus, Saturn, Rahu, Ketu) with sign, degree, nakshatra, pada, Whole Sign house and retrograde status.

calculate_navamsa

Calculates the D-9 (Navamsa) divisional chart. Returns each planet's navamsa sign and house from the navamsa lagna.

calculate_dasha

Vimshottari Dasha timeline: Mahadashas covering 120 years from birth with calendar dates, the birth-time balance, and the current Mahadasha's full Antardasha breakdown (active one included). Optional as_of (YYYY-MM-DD) overrides "today". Use for any timing question.

get_current_transits

Gochar: sidereal transit signs of all 9 grahas for today (or optional target_date). Pass the optional moon_sign (the rashi.sign from calculate_kundali) to also get each planet's house counted from the Moon and the sade_sati_status flag (Saturn in 12th/1st/2nd from the Moon).

get_question_context

One-shot context for a life-area question (English or Hinglish): routes the question to its Vedic houses (career/naukri → 10, marriage/shaadi → 7, wealth/paisa → 2+11, health/sehat → 1+6, education/padhai → 4+5, children/santan → 5, family/parivar → 4+9, personality/swabhav → 1), analyzes each house in the native's chart (sign, occupant planets, house lord, lord's placement) and retrieves the most relevant BPHS passages (with page numbers) from the bundled index (data/book_index.json). Takes the birth-data fields plus question.

generate_horoscope

Everything needed to write a transit-based horoscope for a natal Moon sign, for one of three timeframes: today (Moon + Sun aspect, ~100 words), 2weeks (Sun/Mercury/Venus with upcoming sign changes, ~200 words), 6months (Jupiter/Saturn/Rahu/Ketu with Sade Sati, ~300 words). Returns the filtered transit facts, relevant BPHS passages, and a ready-to-use system_prompt + suggested_prompt. The server does not call an LLM — the client writes the horoscope text: Claude Desktop's model follows the returned prompts directly; the ASTRO-MOCK Flask app passes them to its own llm_provider. Only moon_sign and timeframe are required; transit_data and sade_sati_status are computed automatically when omitted.

Prompt

vedic-interpretation

The interpretation ruleset (never invent placements, cite reasoning, non-deterministic language, structured Summary/Factors/Interpretation/ References/Confidence format). Attach it in the client, then answer questions using the tool outputs.

Typical flow for "kya mera career acha hoga":

1. calculate_kundali → lagna, rashi, placements
2. get_question_context (same birth data + question) → houses, analysis, BPHS refs
3. calculate_dasha → current Mahadasha/Antardasha
4. get_current_transits with moon_sign → Gochar + Sade Sati
5. Interpret per the vedic-interpretation prompt.

Inputs (both tools):

Parameter	Type	Example
date_of_birth	string	"1995-08-21"
time_of_birth	string	"14:35"
latitude	number	28.6139
longitude	number	77.2090
timezone_str	string	"Asia/Kolkata"
unknown_time	boolean (optional, default false)	true if birth time is uncertain — ascendant and houses are then omitted

Setup

python -m venv .venv
.venv\Scripts\pip install -r requirements.txt

Running the server

The server speaks MCP over stdio (an HTTP transport is planned later):

.venv\Scripts\python server.py

It will sit waiting for an MCP client on stdin/stdout — that's normal; it is not meant to be used directly from the terminal.

Use with Claude Desktop

Add to your claude_desktop_config.json (%APPDATA%\Claude\claude_desktop_config.json on Windows):

{
  "mcpServers": {
    "astromock": {
      "command": "C:\\Users\\anshi\\Downloads\\astromock-mcp\\.venv\\Scripts\\python.exe",
      "args": ["C:\\Users\\anshi\\Downloads\\astromock-mcp\\server.py"]
    }
  }
}

Restart Claude Desktop; the calculate_kundali and calculate_navamsa tools will appear.

Verify with the MCP Inspector

npx @modelcontextprotocol/inspector .venv\Scripts\python.exe server.py

This opens a web UI where you can list the tools and invoke them with test inputs.

Verify with the bundled test client

.venv\Scripts\python test_client.py

Spawns the server over stdio, lists registered tools, and calls calculate_kundali with sample birth data.