AstroWay Astrology API (full catalogue)

Four Transformations (四化)

astroway_ziwei_four_transformations

Read-onlyIdempotent

The four stars activated by the birth year stem: 化禄 fortune, 化权 authority, 化科 repute, 化忌 obstruction. The one part of Zi Wei computable without star placement. Seven stems are agreed across traditions; for the three that are not (戊庚壬) every school reading ships in schoolVariants, and school switches the headline answer.

[Group: Zi Wei Dou Shu (Purple Star)] [Endpoint: POST /v1/ziwei/four-transformations] [Required: date] [Cost: 10 credits (Tier 1)]

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "date": "<date>"
    },
    "name": "astroway_ziwei_four_transformations"
  }
}

Input Schema

Name	Required	Description
`date`	Yes
`time`	No
`fields`	No	Compact mode: comma-separated dotted paths to keep, relative to `data`, e.g. "planets.name,planets.longitude,houses.cusp". Omit for the whole response.
`school`	No
`timezone`	No	IANA zone name such as Europe/Kyiv, or auto to look the zone up from latitude and longitude. The server takes the offset that zone kept at this local date and time, summer time included, and uses it in place of timezoneOffset. A clock time that happened twice takes the first occurrence; one skipped when clocks went forward takes the offset from before the change. Abbreviations such as EST are refused. Before 1970 the tz database is not reliable for every place, so send timezoneOffset when the local clock is known.
`dayDivide`	No
`precision`	No	Compact mode: round fractional numbers to this many decimals. Longitudes carry 14 by default; 2 is finer than any chart is drawn.
`yearDivide`	No
`timezoneOffset`	No	Ignored when timezone is sent.

Output Schema

Name	Required	Description	Default
`notes`	No
`school`	No
`disputed`	No
`yearStem`	No
`solarYear`	No
`schoolVariants`	No
`transformations`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedNov 14, 2026

addedInput schema / properties / dayDivide

Added value: +{
+  "enum": [
+    "forward",
+    "current"
+  ],
+  "type": "string"
+}

addedInput schema / properties / yearDivide

Added value: +{
+  "enum": [
+    "lunar",
+    "lichun"
+  ],
+  "type": "string"
+}

Changed9 schema fields changedNov 7, 2026

removedOutput schema / properties / disputed / anyOf

Removed value: -[
-  {
-    "type": "boolean"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / disputed / type
```
Added value: +[
+  "boolean",
+  "null"
+]
```

changedOutput schema / properties / notes / anyOf

Previous value: -[
-  {
-    "items": {
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-        {
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-]New value: +[
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+        "null"
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+    },
+    "type": "array"
+  },
+  {
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+  }
+]

changedOutput schema / properties / school / anyOf

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changedOutput schema / properties / schoolVariants / anyOf

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+                        ]
+                      },
+                      "name": {
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      }
+                    },
+                    "type": "object"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "zhongzhou": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "ji": {
+                "anyOf": [
+                  {
+                    "additionalProperties": {},
+                    "properties": {
+                      "chinese": {
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      },
+                      "name": {
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      }
+                    },
+                    "type": "object"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "ke": {
+                "anyOf": [
+                  {
+                    "additionalProperties": {},
+                    "properties": {
+                      "chinese": {
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      },
+                      "name": {
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      }
+                    },
+                    "type": "object"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "lu": {
+                "anyOf": [
+                  {
+                    "additionalProperties": {},
+                    "properties": {
+                      "chinese": {
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      },
+                      "name": {
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      }
+                    },
+                    "type": "object"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "quan": {
+                "anyOf": [
+                  {
+                    "additionalProperties": {},
+                    "properties": {
+                      "chinese": {
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      },
+                      "name": {
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      }
+                    },
+                    "type": "object"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      }
+    },
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / properties / solarYear / anyOf

Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / solarYear / type
```
Added value: +[
+  "number",
+  "null"
+]
```

changedOutput schema / properties / transformations / anyOf

Previous value: -[
-  {
-    "items": {
-      "anyOf": [
-        {
-          "additionalProperties": {},
-          "properties": {
-            "chinese": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "kind": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "name": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "pinyin": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "star": {
-              "anyOf": [
-                {
-                  "additionalProperties": {},
-                  "properties": {
-                    "chinese": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "name": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    }
-                  },
-                  "type": "object"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "theme": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            }
-          },
-          "type": "object"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "items": {
+      "anyOf": [
+        {
+          "additionalProperties": {},
+          "properties": {
+            "chinese": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "kind": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "name": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "pinyin": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "star": {
+              "anyOf": [
+                {
+                  "additionalProperties": {},
+                  "properties": {
+                    "chinese": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    },
+                    "name": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    }
+                  },
+                  "type": "object"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "theme": {
+              "type": [
+                "string",
+                "null"
+              ]
+            }
+          },
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "type": "array"
+  },
+  {
+    "type": "null"
+  }
+]

changedOutput schema / properties / yearStem / anyOf

Previous value: -[
-  {
-    "additionalProperties": {},
-    "properties": {
-      "chinese": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "pinyin": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      }
-    },
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": {},
+    "properties": {
+      "chinese": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "pinyin": {
+        "type": [
+          "string",
+          "null"
+        ]
+      }
+    },
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

First observedOct 5, 2026

TDQS

A3.7/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), so the description earns credit for going beyond them: it discloses that three of the ten stems (戊庚壬) are contested across schools, that every school reading is returned in schoolVariants, and that `school` changes the headline answer. That is genuinely useful output-shape behavior an agent could not infer from the schema. It does not mention rate limits or response size, but the key behavioral nuance is present.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Three tightly written sentences: what the tool computes first, then the differentiation, then the school caveat. The bracketed metadata block (group, endpoint, required, cost) is boilerplate but front-loads cost and the required parameter efficiently. No redundant restatement of the name.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

An output schema exists, so return values need not be explained, and the description supplies cost, endpoint, required field, and the school-variant behavior — enough to call the tool correctly. The remaining gap is routing guidance relative to the chart tools and any explanation of the dayDivide/yearDivide calendar conventions, which for an astrology calculation could change results.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 44%, so the description should compensate. It does add real meaning for `school` — explaining that it selects the headline answer while all variants ship in schoolVariants — which is the parameter that matters most. However date, time, dayDivide, and yearDivide carry no explanation in either the schema or the description, leaving the calendar-division parameters undocumented.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description names a specific verb-like operation (computing the four activated stars) plus the exact resource (化禄/化权/化科/化忌 keyed to the birth year stem), and adds 'the one part of Zi Wei computable without star placement' to place it relative to the chart tools. It stops short of naming a concrete sibling like astroway_ziwei_chart as the alternative, so it is clear but not fully differentiated.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage is only implied: the tool is framed as the star-placement-free slice of Zi Wei, and the `school` discussion tells the agent what to expect when traditions disagree. There is no explicit statement of when to call this versus astroway_ziwei_chart or astroway_ziwei_full_chart, and no prerequisites or exclusions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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