Summary
Connects Claude to Saroday's Korean Saju (사주) calculation API so you stop getting wrong Four Pillars results from LLMs that can't handle manse-ryeok lookups or jeolgi boundaries correctly. Exposes four tools: calculate_saju for full eight-character analysis with sipseong, sinsal, hapchung, and daeun cycles; lookup_glossary for 80+ myeongni-hak terms like 도화살 or 천을귀인; get_daily_fortune for zodiac readings; and discover_saroday_api for endpoint metadata. Runs via stdio, delegates all math to Saroday's verified server while Claude handles interpretation. Public tier gives you 100 requests per hour. Useful when you need accurate Korean fortune-telling calculations without teaching an LLM the entire 滴天髓 corpus.
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@saroday/mcp-server
MCP (Model Context Protocol) server for Saroday — Korean Saju (사주) calculation and myeongni-hak (命理學) glossary lookup.
This MCP server lets Claude Desktop, Cline, Cursor, and any other MCP-compatible AI client perform accurate Korean Saju (Four Pillars of Destiny) calculation by calling the public Saroday API under the hood.
What it does
When connected, the AI client gains access to four tools:
| Tool | Description |
|---|---|
calculate_saju | Compute full Saju analysis (8 characters, sipseong, sinsal, hapchung, 12-unseong, yongshin, daeun) from birth date / time / gender. |
lookup_glossary | Look up any of 80+ myeongni-hak terms (도화살, 천을귀인, 식신, 육합, etc.) with full Korean explanation. |
get_daily_fortune | Today's fortune for one of 12 Western zodiac signs or 12 Chinese zodiac signs. Cached server-side, fast response. |
discover_saroday_api | List available Saroday API endpoints and metadata. |
Why this matters: ChatGPT, Claude, and other LLMs frequently miscalculate Saju when asked directly because manse-ryeok (萬歲曆) lookup and 절기 (jeolgi) boundary handling require precise data. This MCP delegates the math to a verified server while letting the AI focus on the interpretation.
Installation
Option A — npx (no install)
npx @saroday/mcp-server
Option B — global install
npm install -g @saroday/mcp-server
saroday-mcp
Option C — clone and run
git clone https://github.com/saroday/mcp-server.git
cd mcp-server
npm install
node index.js
Requires Node.js 18 or newer.
Configure Claude Desktop
Edit your Claude Desktop config file:
- macOS:
~/Library/Application Support/Claude/claude_desktop_config.json - Windows:
%APPDATA%\Claude\claude_desktop_config.json
Add (or merge) the following:
{
"mcpServers": {
"saroday": {
"command": "npx",
"args": ["-y", "@saroday/mcp-server"]
}
}
}
Restart Claude Desktop. You should see "saroday" listed in the MCP servers panel (the plug icon in the input area).
Local development (running from cloned repo)
{
"mcpServers": {
"saroday": {
"command": "node",
"args": ["/absolute/path/to/mcp-server/index.js"]
}
}
}
Configure Cline / Cursor / other MCP clients
Any MCP client that supports stdio transport works. Point it at the saroday-mcp binary or node index.js. See your client's docs for the exact config format.
Try it out
After connecting, ask Claude things like:
- "My birthday is March 15, 1992 at 10am. Calculate my Korean Saju."
- "What does 도화살 (dohwa-sal) mean in Korean fortune-telling?"
- "내 사주 봐줘. 1990년 5월 20일 음력 14시 여성."
- "제왕(jeokwang) 12-unseong이 뭐야?"
Claude will automatically invoke calculate_saju or lookup_glossary and give you a polished interpretation based on the structured data returned.
Environment variables
| Variable | Default | Purpose |
|---|---|---|
SARODAY_API_BASE | https://saroday.com | Override the API base URL (e.g., for self-hosted or staging environments). |
Rate limits
The public Saroday API allows 100 requests per hour per IP for free use. Heavy users — apps shipping to many end-users, AI agents handling many concurrent users — should request an API key (coming soon) for higher quotas.
Contact: contact@saroday.com
How it works
[User in Claude Desktop]
↓ types "내 사주 봐줘"
[Claude Desktop]
↓ calls calculate_saju via MCP stdio
[saroday-mcp (this package, runs locally)]
↓ HTTPS POST /api/v1/saju
[saroday.com server]
↓ runs verified manse-ryeok algorithm
[result JSON]
↑ flows back through the chain
[Claude] writes a beautiful Korean interpretation
This MCP package is a thin adapter — all calculation lives on Saroday's servers, so updates to the algorithm or glossary roll out without you having to upgrade the package.
Differentiators
- Manse-ryeok accuracy — handles 절기 (solar terms) boundaries that LLMs routinely get wrong (verified against
@fullstackfamily/manseryeoklibrary) - 80+ glossary entries (~400 interpretation fields) — every sinsal, hapchung, sipseong, 12-unseong term has summary / meaning / positive / negative / practical-tip interpretation written in friendly Korean
- Korean myeongni-hak tradition — based on 적천수(滴天髓), 자평진전(子平真詮), 궁통보감(窮通寶鑑) references
- Three-channel exposure — same algorithm available as web service (saroday.com), public REST API (saroday.com/api/v1), and MCP server (this package). Pick the channel that fits your integration.
License
MIT
Support
- Web: https://saroday.com
- API docs: https://saroday.com/api/docs
- LLM-friendly index: https://saroday.com/llms.txt
- Email: contact@saroday.com
Featured
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
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Get API Key Now →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →