get_compatibility

Production

Status: Production.

Two dates in → Cosmic card A and Cosmic card B, connections between them, and a scored breakdown. Scoring follows the cardology connection system (Cards of Destiny / Robert Camp tradition).

When to use: comparing two dates only (date_a, date_b). For a single date → get_date.

One call returns two full date profiles (each the same shape as get_date — Cosmic card + calendars, moon, season, Rx, and the rest) plus a weighted compatibility score and cross-wheel aspects. Each side’s cosmic.planetary_spread includes spread_pos (1–14) — sort by that field; see get_date → Planetary spread order.


Input	`date_a`, `date_b` (YYYY-MM-DD)
Range	Same coverage bands as `get_date` — `temporal_context.date_a` / `date_b` = `full` inside 1900–2100; `extended` nearby; farther out → `out_of_range` with Cosmic-card-only scope
Version	`v1.8.10`
MCP URL	`https://mcp.geometry.app/mcp`

Ask:

How compatible are 1985-03-15 and 1990-11-08?

Live payloads are large (~85 KB). Below is a teaching excerpt — Cosmic card A / B profiles abbreviated. Full payload / raw JSON: call this tool — live response is the complete object (no verbosity flag). Chat may summarize; ask for the raw tool result if the UI truncates.

Example response

{
  "tool": "get_compatibility",
  "tool_version": "v1.8.10",
  "engine_chain": "v0.66",
  "flags": {
    "is_same_card": false,
    "is_self_pair": false,
    "is_wild_card": false
  },
  "summary": "Compatibility: cosmic_card_* = full cosmic block; seven *_aspect + geomancy_pair informational under v1 (only chinese_zodiac_bonus summed; chinese_wheel_bonus shown not added); temporal_context.{date_a,date_b}={band,payload_scope}; focus SLA 1900-2100.",
  "life_path_a": 5,
  "life_path_b": 2,
  "cosmic_card_a": "… Cosmic card A for date_a — full get_date shape (incl. tarot_majors) …",
  "cosmic_card_b": "… Cosmic card B for date_b — full get_date shape (incl. tarot_majors) …",
  "temporal_context": {
    "date_a": { "band": "full", "payload_scope": "full" },
    "date_b": { "band": "full", "payload_scope": "full" }
  },
  "true_sidereal_a": "…",
  "true_sidereal_b": "…",
  "card_connections": [
    {
      "type": "jupiter",
      "direction": "a_to_b",
      "planet_to_planet": "harmonious"
    }
  ],
  "element_to_element": "neutral",
  "compatibility_score": {
    "bonuses": {
      "element_bonus": 0,
      "scoring_policy": "v1",
      "same_card_match": 0,
      "self_pair_penalty": 0,
      "ruling_planet_bonus": 0,
      "true_sidereal_bonus": -1,
      "chinese_zodiac_bonus": -2,
      "chinese_wheel_bonus": -2
    },
    "card_score": {
      "a_to_b": 3,
      "b_to_a": 0,
      "combined": 3,
      "connection_count_total": 1
    },
    "overall_score": 1,
    "interpretation": "neutral",
    "ruling_planet_to_planet": {
      "a_to_b": "neutral",
      "b_to_a": "neutral",
      "bonus_score": 0,
      "card_a_planet": "mars",
      "card_b_planet": "venus"
    }
  },
  "true_sidereal_aspect": "quincunx",
  "chinese_zodiac_aspect": "quincunx",
  "chinese_wheel_aspect": "quincunx"
}

chinese_zodiac_aspect can also be harmonic_pair (Chinese secret-friend / Liu He pair — not a Western aspect). When that wins, chinese_wheel_aspect still shows the leftover 9027 Western-grid label; chinese_wheel_bonus is returned and not added to overall_score. See What you get → Aspect map.

How scoring works (do one pair by hand)

You can score one pair yourself. Use the MCP tool when you have many dates or many permutations — same math, just faster. Most real pairs have different Cosmic cards. Same-card matches are rare; the first example below shows one on purpose so you can see the same-card line, then a second example shows the usual case.

Chinese bonus table (what enters the score)

Scored Chinese aspect	Bonus
`trine` (San He)	+13
`harmonic_pair` (Liu He)	+8
`sextile`	+3
`semisextile`	+2
`quincunx`	−2
`square`	−5
`opposition`	−8
`none`	0

Only chinese_zodiac_bonus is summed. If you also see chinese_wheel_aspect / chinese_wheel_bonus, that is a leftover Western-grid label — do not add it.

Example A — Liu He + same Cosmic card (uncommon)

Dates: 2029-02-27 × 2024-02-27 (rooster × dragon — Chinese secret-friend / Liu He).

Date	Animal	Cosmic card
2029-02-27	rooster	same card as B
2024-02-27	dragon	same card as A

Scored Chinese aspect = harmonic_pair → chinese_zodiac_bonus = +8.

Line	Value	Notes
Same Cosmic card	+13	Both dates share one Cosmic card
Element harmony	+5	Harmonious classical elements
Ruling-planet bonus	0	Neutral
Card connections (`card_score.combined`)	0	No scored cardology edges here
Chinese zodiac (Liu He)	+8	From the table
True sidereal / other wheels	(shown, not added)	Policy `v1`

13 + 5 + 0 + 0 + 8 = 26

Live check: overall_score 26, chinese_zodiac_aspect harmonic_pair, interpretation deeply_harmonious.

Example B — San He trine + different Cosmic cards (typical)

Dates: 2024-03-01 × 2028-06-15 (dragon × monkey — Chinese San He / trine). Cosmic cards differ.

Date	Animal	Cosmic card
2024-03-01	dragon	9♠
2028-06-15	monkey	2♦

Scored Chinese aspect = trine → chinese_zodiac_bonus = +13. Wheel leftover is none / 0 (San He has no 9027 Western-grid twin).

Line	Value	Notes
Same Cosmic card	0	9♠ ≠ 2♦ — usual case
Element harmony	−3	Challenging classical elements
Ruling-planet bonus	+1	Slight planetary edge
Card connections (`card_score.combined`)	+1	One scored cardology edge
Chinese zodiac (San He)	+13	From the table
True sidereal / other wheels	(shown, not added)	Policy `v1`

0 + (-3) + 1 + 1 + 13 = 12

Live check: overall_score 12, chinese_zodiac_aspect trine, same-card bonus 0.

When to use the tool

Situation	Do this
One or two dates	Score by hand with the table above (or one MCP call to confirm)
Many birthdays, a roster, or all permutations	Call `get_compatibility` repeatedly — same formula, no hand arithmetic

The six Liu He pairs: rat–ox · tiger–pig · rabbit–dog · dragon–rooster · snake–monkey · horse–goat.
San He (trine) groups: rat–dragon–monkey · ox–snake–rooster · tiger–horse–dog · rabbit–goat–pig.

Wire names: inputs and temporal_context use date_a / date_b. Full date profiles are cosmic_card_a / cosmic_card_b. Out-of-range Cosmic-card-only scope uses payload_scope: "cosmic_card_only". Cosmic card = birth = life = sun (cosmic.also_called).

get_date — one date → Cosmic card
get_name — name → Cosmic cards

Get started

Tools

Resources

Reference

get_compatibility

Example response

How scoring works (do one pair by hand)

Chinese bonus table (what enters the score)

Example A — Liu He + same Cosmic card (uncommon)

Example B — San He trine + different Cosmic cards (typical)

When to use the tool

​Example response

​How scoring works (do one pair by hand)

​Chinese bonus table (what enters the score)

​Example A — Liu He + same Cosmic card (uncommon)

​Example B — San He trine + different Cosmic cards (typical)

​When to use the tool

​Related

Example response

How scoring works (do one pair by hand)

Chinese bonus table (what enters the score)

Example A — Liu He + same Cosmic card (uncommon)

Example B — San He trine + different Cosmic cards (typical)

When to use the tool

Related