SAJU (Korean Fortune Teller)
https://sajufromseoul.com/mcp ↗
Description
Saju from Seoul — Korean Four Pillars (사주) over MCP: compute 년·월·일·시 pillars, Five Elements balance, Day Master (일간) profiles, stem/branch reference, and Day Master compatibility. Deterministic math, zero API keys, no outbound fortune API calls. Use sajufromseoul.com for full narrative readings and disclaimers.
What our measurements say
SAJU (Korean Fortune Teller) is a remote MCP server published at sajufromseoul.com. It has been probed 6 times since 9/10/2026. It answered in 6 of them (100.0%), a near-uninterrupted record. Median response time is 240 ms, placing it among the faster endpoints. It offers a narrow, focused set of 4 tools. On the protocol side it still runs 2025-11-25 and has not moved to the newer spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Strengths
- Tool names directly reflect their purpose (e.g., 'calculate_saju' for birth chart computation).
- No tool overlap; each has distinct use cases (e.g., compatibility vs. static reference).
- Descriptions specify input requirements (e.g., 'Gregorian birth date' for 'calculate_saju').
Weaknesses
- The 'check_compatibility' description includes vague terms like 'entertainment / cult' without context.
- The 'list_stems_and_branches' tool lacks explicit parameter details in its input schema summary.
- Some descriptions (e.g., 'get_day_master') assume prior tool usage without clear fallbacks.
check_compatibility— Ambiguous 'entertainment / cult' reference in description.list_stems_and_branches— Input parameters not explicitly defined in schema summary.
Verdict
Event narrative
Risk: medium
- 2026-09-10T21:16:35.016Z — era changed from unknown to legacy · indicates system transition to a supported era
- 2026-09-11T07:35:54.413Z — complianceScore set to 100 · confirms full compliance with operational standards
Advice
Schema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test not run this round
- Cold-start: cold 72ms → warm 85ms (penalty 0ms)
Availability history
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Server build: — → 1.0.6
- Supported versions: — → 2025-11-25
- Era changed: Unknown → Legacy
- Added to watch — era: Unknown
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