AstroWay Astrology API (full catalogue)

Transit Calendar

astroway_prognostics_transit_calendar

Read-onlyIdempotent

List the exact moments of transit-to-natal aspects in a date range, one event per exact pass, so a retrograde triple pass gives three events.

[Group: Prognostics] [Endpoint: POST /v1/transit-calendar] [Cost: 100 credits (Tier 4)]

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": {
      "body": "<body>"
    },
    "name": "astroway_prognostics_transit_calendar"
  }
}

Input Schema

Name	Required	Description
`body`	Yes	Wrapper { natal: ChartInput } used by endpoints that take a base natal plus extra parameters in flat fields.
`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.
`precision`	No	Compact mode: round fractional numbers to this many decimals. Longitudes carry 14 by default; 2 is finer than any chart is drawn.

Output Schema

Name	Required	Description	Default
`count`	No
`events`	No
`maxOrb`	No
`endDate`	No
`startDate`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed10 schema fields changedNov 7, 2026

changedInput schema / properties / body / allOf

Previous value: -[
-  {
-    "description": "Wrapper { natal: ChartInput } used by endpoints that take a base natal plus extra parameters in flat fields.",
-    "properties": {
-      "natal": {
-        "additionalProperties": {
-          "anyOf": [
-            {},
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "description": "Birth data for a single natal chart. Required: date (YYYY-MM-DD), time (HH:mm:ss), latitude and longitude in decimal degrees. The short forms lat, lon, lng and tz are rejected with 400 INVALID_FIELD; pass the full names. timezoneOffset is hours from UTC and defaults to 0, meaning UTC; send timezone instead (an IANA name such as Europe/Kyiv, or auto) and the offset for that date is worked out, summer time included. city is a display label only: nothing here geocodes it, so it never stands in for coordinates. houseSystem is a single house-system letter, P by default; a name such as \"Placidus\" is refused, and the case matters because I and i are two different Sunshine systems.",
-        "properties": {
-          "ayanamsa": {
-            "description": "Sidereal school by name. Lahiri when omitted. Equivalent to ayanamsaId; send either.",
-            "enum": [
-              "fagan-bradley",
-              "lahiri",
-              "de-luce",
-              "raman",
-              "krishnamurti",
-              "kp",
-              "yukteshwar",
-              "jn-bhasin",
-              "true-citra",
-              "djwhal-khul"
-            ],
-            "type": "string"
-          },
-          "ayanamsaId": {
-            "anyOf": [
-              {
-                "type": "number"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "city": {
-            "default": "",
-            "type": "string"
-          },
-          "cosmogram": {
-            "type": "boolean"
-          },
-          "date": {
-            "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
-            "type": "string"
-          },
-          "houseSystem": {
-            "default": "P",
-            "enum": [
-              "P",
-              "K",
-              "R",
-              "C",
-              "E",
-              "W",
-              "B",
-              "M",
-              "O",
-              "A",
-              "T",
-              "V",
-              "D",
-              "F",
-              "G",
-              "H",
-              "I",
-              "i",
-              "L",
-              "N",
-              "Q",
-              "S",
-              "U",
-              "X",
-              "Y"
-            ],
-            "type": "string"
-          },
-          "latitude": {
-            "maximum": 90,
-            "minimum": -90,
-            "type": "number"
-          },
-          "longitude": {
-            "maximum": 180,
-            "minimum": -180,
-            "type": "number"
-          },
-          "name": {
-            "default": "",
-            "type": "string"
-          },
-          "time": {
-            "pattern": "^\\d{2}:\\d{2}(:\\d{2})?$",
-            "type": "string"
-          },
-          "timezone": {
-            "description": "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.",
-            "type": "string"
-          },
-          "timezoneOffset": {
-            "anyOf": [
-              {
-                "maximum": 14,
-                "minimum": -14,
-                "type": "number"
-              },
-              {
-                "type": "null"
-              }
-            ],
-            "default": 0,
-            "description": "Hours from UTC at the given moment, not minutes. Fractional zones are hours too: 5.5 for India, 5.75 for Nepal, -3.5 for Newfoundland. Defaults to 0, meaning UTC. Ignored when timezone is sent."
-          },
-          "zodiacType": {
-            "enum": [
-              "tropical",
-              "sidereal"
-            ],
-            "type": "string"
-          }
-        },
-        "required": [
-          "date",
-          "time",
-          "latitude",
-          "longitude"
-        ],
-        "type": "object"
-      }
-    },
-    "required": [
-      "natal"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "aspectAngles": {
-        "description": "Subset of 0, 60, 90, 120, 180 (the default is all five). Other angles match nothing and answer 400.",
-        "items": {
-          "anyOf": [
-            {
-              "maximum": 360,
-              "minimum": 0,
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "maxItems": 64,
-        "type": "array"
-      },
-      "endDate": {
-        "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
-        "type": "string"
-      },
-      "maxOrb": {
-        "anyOf": [
-          {
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Accepted and echoed back, but it does not filter anything: every event is an exact hit, found by the sign change of the offset and refined by bisection, so its orb is 0. Must be in (0, 10] if sent."
-      },
-      "startDate": {
-        "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
-        "type": "string"
-      },
-      "transitPlanetIds": {
-        "description": "Transiting bodies, ids 0 and 2-9 (Sun, Mercury to Pluto; the Moon is excluded). Default: all nine.",
-        "items": {
-          "anyOf": [
-            {
-              "maximum": 9007199254740991,
-              "minimum": 0,
-              "type": "integer"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "maxItems": 32,
-        "type": "array"
-      }
-    },
-    "required": [
-      "startDate",
-      "endDate"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "description": "Wrapper { natal: ChartInput } used by endpoints that take a base natal plus extra parameters in flat fields.",
+    "properties": {
+      "natal": {
+        "additionalProperties": {
+          "anyOf": [
+            {},
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "description": "Birth data for a single natal chart. Required: date (YYYY-MM-DD), time (HH:mm:ss), latitude and longitude in decimal degrees. The short forms lat, lon, lng and tz are rejected with 400 INVALID_FIELD; pass the full names. timezoneOffset is hours from UTC and defaults to 0, meaning UTC; send timezone instead (an IANA name such as Europe/Kyiv, or auto) and the offset for that date is worked out, summer time included. city is a display label only: nothing here geocodes it, so it never stands in for coordinates. houseSystem is a single house-system letter, P by default; a name such as \"Placidus\" is refused, and the case matters because I and i are two different Sunshine systems.",
+        "properties": {
+          "ayanamsa": {
+            "description": "Sidereal school by name. Lahiri when omitted. Equivalent to ayanamsaId; send either.",
+            "enum": [
+              "fagan-bradley",
+              "lahiri",
+              "de-luce",
+              "raman",
+              "krishnamurti",
+              "kp",
+              "yukteshwar",
+              "jn-bhasin",
+              "true-citra",
+              "djwhal-khul"
+            ],
+            "type": "string"
+          },
+          "ayanamsaId": {
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "city": {
+            "default": "",
+            "type": "string"
+          },
+          "cosmogram": {
+            "type": "boolean"
+          },
+          "date": {
+            "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+            "type": "string"
+          },
+          "houseSystem": {
+            "default": "P",
+            "enum": [
+              "P",
+              "K",
+              "R",
+              "C",
+              "E",
+              "W",
+              "B",
+              "M",
+              "O",
+              "A",
+              "T",
+              "V",
+              "D",
+              "F",
+              "G",
+              "H",
+              "I",
+              "i",
+              "L",
+              "N",
+              "Q",
+              "S",
+              "U",
+              "X",
+              "Y"
+            ],
+            "type": "string"
+          },
+          "latitude": {
+            "maximum": 90,
+            "minimum": -90,
+            "type": "number"
+          },
+          "longitude": {
+            "maximum": 180,
+            "minimum": -180,
+            "type": "number"
+          },
+          "name": {
+            "default": "",
+            "type": "string"
+          },
+          "time": {
+            "pattern": "^\\d{2}:\\d{2}(:\\d{2})?$",
+            "type": "string"
+          },
+          "timezone": {
+            "description": "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.",
+            "type": "string"
+          },
+          "timezoneOffset": {
+            "anyOf": [
+              {
+                "maximum": 14,
+                "minimum": -14,
+                "type": "number"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "default": 0,
+            "description": "Hours from UTC at the given moment, not minutes. Fractional zones are hours too: 5.5 for India, 5.75 for Nepal, -3.5 for Newfoundland. Defaults to 0, meaning UTC. Ignored when timezone is sent."
+          },
+          "zodiacType": {
+            "enum": [
+              "tropical",
+              "sidereal"
+            ],
+            "type": "string"
+          }
+        },
+        "required": [
+          "date",
+          "time",
+          "latitude",
+          "longitude"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "natal"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "aspectAngles": {
+        "description": "Subset of 0, 60, 90, 120, 180 (the default is all five). Other angles match nothing and answer 400.",
+        "items": {
+          "anyOf": [
+            {
+              "maximum": 360,
+              "minimum": 0,
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "maxItems": 64,
+        "type": "array"
+      },
+      "endDate": {
+        "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+        "type": "string"
+      },
+      "maxOrb": {
+        "description": "Accepted and echoed back, but it does not filter anything: every event is an exact hit, found by the sign change of the offset and refined by bisection, so its orb is 0. Must be in (0, 10] if sent.",
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "startDate": {
+        "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+        "type": "string"
+      },
+      "transitPlanetIds": {
+        "description": "Transiting bodies, ids 0 and 2-9 (Sun, Mercury to Pluto; the Moon is excluded). Default: all nine.",
+        "items": {
+          "anyOf": [
+            {
+              "maximum": 9007199254740991,
+              "minimum": 0,
+              "type": "integer"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "maxItems": 32,
+        "type": "array"
+      }
+    },
+    "required": [
+      "startDate",
+      "endDate"
+    ],
+    "type": "object"
+  }
+]

removedOutput schema / properties / count / anyOf

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

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

removedOutput schema / properties / endDate / anyOf

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

addedOutput schema / properties / endDate / type
```
Added value: +[
+  "string",
+  "null"
+]
```

changedOutput schema / properties / events / anyOf

Previous value: -[
-  {
-    "items": {
-      "anyOf": [
-        {
-          "additionalProperties": {},
-          "properties": {
-            "aspect": {
-              "anyOf": [
-                {
-                  "additionalProperties": {},
-                  "properties": {
-                    "angle": {
-                      "anyOf": [
-                        {
-                          "type": "number"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "color": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "i18nKey": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "isMajor": {
-                      "anyOf": [
-                        {
-                          "type": "boolean"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "name": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "orb": {
-                      "anyOf": [
-                        {
-                          "type": "number"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "symbol": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    }
-                  },
-                  "type": "object"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "date": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "isRetrograde": {
-              "anyOf": [
-                {
-                  "type": "boolean"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "jd": {
-              "anyOf": [
-                {
-                  "type": "number"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "natalLongitude": {
-              "anyOf": [
-                {
-                  "type": "number"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "natalPlanetId": {
-              "anyOf": [
-                {
-                  "type": "number"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "transitLongitude": {
-              "anyOf": [
-                {
-                  "type": "number"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "transitPlanetId": {
-              "anyOf": [
-                {
-                  "type": "number"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            }
-          },
-          "type": "object"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "items": {
+      "anyOf": [
+        {
+          "additionalProperties": {},
+          "properties": {
+            "aspect": {
+              "anyOf": [
+                {
+                  "additionalProperties": {},
+                  "properties": {
+                    "angle": {
+                      "type": [
+                        "number",
+                        "null"
+                      ]
+                    },
+                    "color": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    },
+                    "i18nKey": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    },
+                    "isMajor": {
+                      "type": [
+                        "boolean",
+                        "null"
+                      ]
+                    },
+                    "name": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    },
+                    "orb": {
+                      "type": [
+                        "number",
+                        "null"
+                      ]
+                    },
+                    "symbol": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    }
+                  },
+                  "type": "object"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "date": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "isRetrograde": {
+              "type": [
+                "boolean",
+                "null"
+              ]
+            },
+            "jd": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "natalLongitude": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "natalPlanetId": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "transitLongitude": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "transitPlanetId": {
+              "type": [
+                "number",
+                "null"
+              ]
+            }
+          },
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "type": "array"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / properties / maxOrb / anyOf

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

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

removedOutput schema / properties / startDate / anyOf

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

addedOutput schema / properties / startDate / type
```
Added value: +[
+  "string",
+  "null"
+]
```

Changed1 schema field changedNov 6, 2026

changedInput schema / properties / body / allOf

Previous value: -[
-  {
-    "description": "Wrapper { natal: ChartInput } used by endpoints that take a base natal plus extra parameters in flat fields.",
-    "properties": {
-      "natal": {
-        "additionalProperties": {
-          "anyOf": [
-            {},
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "description": "Birth data for a single natal chart. Required: date (YYYY-MM-DD), time (HH:mm:ss), latitude and longitude in decimal degrees. The short forms lat, lon, lng and tz are rejected with 400 INVALID_FIELD; pass the full names. timezoneOffset is hours from UTC and defaults to 0, meaning UTC; send timezone instead (an IANA name such as Europe/Kyiv, or auto) and the offset for that date is worked out, summer time included. city is a display label only: nothing here geocodes it, so it never stands in for coordinates. houseSystem is a single Swiss Ephemeris letter, P by default; a name such as \"Placidus\" is refused, and the case matters because I and i are two different Sunshine systems.",
-        "properties": {
-          "ayanamsa": {
-            "description": "Sidereal school by name. Lahiri when omitted. Equivalent to ayanamsaId; send either.",
-            "enum": [
-              "fagan-bradley",
-              "lahiri",
-              "de-luce",
-              "raman",
-              "krishnamurti",
-              "kp",
-              "yukteshwar",
-              "jn-bhasin",
-              "true-citra",
-              "djwhal-khul"
-            ],
-            "type": "string"
-          },
-          "ayanamsaId": {
-            "anyOf": [
-              {
-                "type": "number"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "city": {
-            "default": "",
-            "type": "string"
-          },
-          "cosmogram": {
-            "type": "boolean"
-          },
-          "date": {
-            "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
-            "type": "string"
-          },
-          "houseSystem": {
-            "default": "P",
-            "enum": [
-              "P",
-              "K",
-              "R",
-              "C",
-              "E",
-              "W",
-              "B",
-              "M",
-              "O",
-              "A",
-              "T",
-              "V",
-              "D",
-              "F",
-              "G",
-              "H",
-              "I",
-              "i",
-              "L",
-              "N",
-              "Q",
-              "S",
-              "U",
-              "X",
-              "Y"
-            ],
-            "type": "string"
-          },
-          "latitude": {
-            "maximum": 90,
-            "minimum": -90,
-            "type": "number"
-          },
-          "longitude": {
-            "maximum": 180,
-            "minimum": -180,
-            "type": "number"
-          },
-          "name": {
-            "default": "",
-            "type": "string"
-          },
-          "time": {
-            "pattern": "^\\d{2}:\\d{2}(:\\d{2})?$",
-            "type": "string"
-          },
-          "timezone": {
-            "description": "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.",
-            "type": "string"
-          },
-          "timezoneOffset": {
-            "anyOf": [
-              {
-                "maximum": 14,
-                "minimum": -14,
-                "type": "number"
-              },
-              {
-                "type": "null"
-              }
-            ],
-            "default": 0,
-            "description": "Hours from UTC at the given moment, not minutes. Fractional zones are hours too: 5.5 for India, 5.75 for Nepal, -3.5 for Newfoundland. Defaults to 0, meaning UTC. Ignored when timezone is sent."
-          },
-          "zodiacType": {
-            "enum": [
-              "tropical",
-              "sidereal"
-            ],
-            "type": "string"
-          }
-        },
-        "required": [
-          "date",
-          "time",
-          "latitude",
-          "longitude"
-        ],
-        "type": "object"
-      }
-    },
-    "required": [
-      "natal"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "aspectAngles": {
-        "description": "Subset of 0, 60, 90, 120, 180 (the default is all five). Other angles match nothing and answer 400.",
-        "items": {
-          "anyOf": [
-            {
-              "maximum": 360,
-              "minimum": 0,
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "maxItems": 64,
-        "type": "array"
-      },
-      "endDate": {
-        "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
-        "type": "string"
-      },
-      "maxOrb": {
-        "anyOf": [
-          {
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Accepted and echoed back, but it does not filter anything: every event is an exact hit, found by the sign change of the offset and refined by bisection, so its orb is 0. Must be in (0, 10] if sent."
-      },
-      "startDate": {
-        "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
-        "type": "string"
-      },
-      "transitPlanetIds": {
-        "description": "Transiting bodies, ids 0 and 2-9 (Sun, Mercury to Pluto; the Moon is excluded). Default: all nine.",
-        "items": {
-          "anyOf": [
-            {
-              "maximum": 9007199254740991,
-              "minimum": 0,
-              "type": "integer"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "maxItems": 32,
-        "type": "array"
-      }
-    },
-    "required": [
-      "startDate",
-      "endDate"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "description": "Wrapper { natal: ChartInput } used by endpoints that take a base natal plus extra parameters in flat fields.",
+    "properties": {
+      "natal": {
+        "additionalProperties": {
+          "anyOf": [
+            {},
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "description": "Birth data for a single natal chart. Required: date (YYYY-MM-DD), time (HH:mm:ss), latitude and longitude in decimal degrees. The short forms lat, lon, lng and tz are rejected with 400 INVALID_FIELD; pass the full names. timezoneOffset is hours from UTC and defaults to 0, meaning UTC; send timezone instead (an IANA name such as Europe/Kyiv, or auto) and the offset for that date is worked out, summer time included. city is a display label only: nothing here geocodes it, so it never stands in for coordinates. houseSystem is a single house-system letter, P by default; a name such as \"Placidus\" is refused, and the case matters because I and i are two different Sunshine systems.",
+        "properties": {
+          "ayanamsa": {
+            "description": "Sidereal school by name. Lahiri when omitted. Equivalent to ayanamsaId; send either.",
+            "enum": [
+              "fagan-bradley",
+              "lahiri",
+              "de-luce",
+              "raman",
+              "krishnamurti",
+              "kp",
+              "yukteshwar",
+              "jn-bhasin",
+              "true-citra",
+              "djwhal-khul"
+            ],
+            "type": "string"
+          },
+          "ayanamsaId": {
+            "anyOf": [
+              {
+                "type": "number"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "city": {
+            "default": "",
+            "type": "string"
+          },
+          "cosmogram": {
+            "type": "boolean"
+          },
+          "date": {
+            "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+            "type": "string"
+          },
+          "houseSystem": {
+            "default": "P",
+            "enum": [
+              "P",
+              "K",
+              "R",
+              "C",
+              "E",
+              "W",
+              "B",
+              "M",
+              "O",
+              "A",
+              "T",
+              "V",
+              "D",
+              "F",
+              "G",
+              "H",
+              "I",
+              "i",
+              "L",
+              "N",
+              "Q",
+              "S",
+              "U",
+              "X",
+              "Y"
+            ],
+            "type": "string"
+          },
+          "latitude": {
+            "maximum": 90,
+            "minimum": -90,
+            "type": "number"
+          },
+          "longitude": {
+            "maximum": 180,
+            "minimum": -180,
+            "type": "number"
+          },
+          "name": {
+            "default": "",
+            "type": "string"
+          },
+          "time": {
+            "pattern": "^\\d{2}:\\d{2}(:\\d{2})?$",
+            "type": "string"
+          },
+          "timezone": {
+            "description": "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.",
+            "type": "string"
+          },
+          "timezoneOffset": {
+            "anyOf": [
+              {
+                "maximum": 14,
+                "minimum": -14,
+                "type": "number"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "default": 0,
+            "description": "Hours from UTC at the given moment, not minutes. Fractional zones are hours too: 5.5 for India, 5.75 for Nepal, -3.5 for Newfoundland. Defaults to 0, meaning UTC. Ignored when timezone is sent."
+          },
+          "zodiacType": {
+            "enum": [
+              "tropical",
+              "sidereal"
+            ],
+            "type": "string"
+          }
+        },
+        "required": [
+          "date",
+          "time",
+          "latitude",
+          "longitude"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "natal"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "aspectAngles": {
+        "description": "Subset of 0, 60, 90, 120, 180 (the default is all five). Other angles match nothing and answer 400.",
+        "items": {
+          "anyOf": [
+            {
+              "maximum": 360,
+              "minimum": 0,
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "maxItems": 64,
+        "type": "array"
+      },
+      "endDate": {
+        "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+        "type": "string"
+      },
+      "maxOrb": {
+        "anyOf": [
+          {
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "Accepted and echoed back, but it does not filter anything: every event is an exact hit, found by the sign change of the offset and refined by bisection, so its orb is 0. Must be in (0, 10] if sent."
+      },
+      "startDate": {
+        "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+        "type": "string"
+      },
+      "transitPlanetIds": {
+        "description": "Transiting bodies, ids 0 and 2-9 (Sun, Mercury to Pluto; the Moon is excluded). Default: all nine.",
+        "items": {
+          "anyOf": [
+            {
+              "maximum": 9007199254740991,
+              "minimum": 0,
+              "type": "integer"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "maxItems": 32,
+        "type": "array"
+      }
+    },
+    "required": [
+      "startDate",
+      "endDate"
+    ],
+    "type": "object"
+  }
+]

Changed1 schema field changedOct 15, 2026

changedInput schema / properties / body / allOf

Previous value: -[
-  {
-    "description": "Wrapper { natal: ChartInput } used by endpoints that take a base natal plus extra parameters in flat fields.",
-    "properties": {
-      "natal": {
-        "additionalProperties": {
-          "anyOf": [
-            {},
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "description": "Birth data for a single natal chart. Required: date (YYYY-MM-DD), time (HH:mm:ss), latitude and longitude in decimal degrees. The short forms lat, lon, lng and tz are rejected with 400 INVALID_FIELD; pass the full names. timezoneOffset is hours from UTC and defaults to 0, meaning UTC; send timezone instead (an IANA name such as Europe/Kyiv, or auto) and the offset for that date is worked out, summer time included. city is a display label only: nothing here geocodes it, so it never stands in for coordinates. houseSystem is a single Swiss Ephemeris letter, P by default; a name such as \"Placidus\" is refused, and the case matters because I and i are two different Sunshine systems.",
-        "properties": {
-          "ayanamsa": {
-            "description": "Sidereal school by name. Lahiri when omitted. Equivalent to ayanamsaId; send either.",
-            "enum": [
-              "fagan-bradley",
-              "lahiri",
-              "de-luce",
-              "raman",
-              "krishnamurti",
-              "kp",
-              "yukteshwar",
-              "jn-bhasin",
-              "true-citra",
-              "djwhal-khul"
-            ],
-            "type": "string"
-          },
-          "ayanamsaId": {
-            "anyOf": [
-              {
-                "type": "number"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "city": {
-            "default": "",
-            "type": "string"
-          },
-          "cosmogram": {
-            "type": "boolean"
-          },
-          "date": {
-            "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
-            "type": "string"
-          },
-          "houseSystem": {
-            "default": "P",
-            "enum": [
-              "P",
-              "K",
-              "R",
-              "C",
-              "E",
-              "W",
-              "B",
-              "M",
-              "O",
-              "A",
-              "T",
-              "V",
-              "D",
-              "F",
-              "G",
-              "H",
-              "I",
-              "i",
-              "L",
-              "N",
-              "Q",
-              "S",
-              "U",
-              "X",
-              "Y"
-            ],
-            "type": "string"
-          },
-          "latitude": {
-            "maximum": 90,
-            "minimum": -90,
-            "type": "number"
-          },
-          "longitude": {
-            "maximum": 180,
-            "minimum": -180,
-            "type": "number"
-          },
-          "name": {
-            "default": "",
-            "type": "string"
-          },
-          "time": {
-            "pattern": "^\\d{2}:\\d{2}(:\\d{2})?$",
-            "type": "string"
-          },
-          "timezone": {
-            "description": "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.",
-            "type": "string"
-          },
-          "timezoneOffset": {
-            "anyOf": [
-              {
-                "maximum": 14,
-                "minimum": -14,
-                "type": "number"
-              },
-              {
-                "type": "null"
-              }
-            ],
-            "default": 0,
-            "description": "Hours from UTC at the given moment, not minutes. Fractional zones are hours too: 5.5 for India, 5.75 for Nepal, -3.5 for Newfoundland. Defaults to 0, meaning UTC. Ignored when timezone is sent."
-          },
-          "zodiacType": {
-            "enum": [
-              "tropical",
-              "sidereal"
-            ],
-            "type": "string"
-          }
-        },
-        "required": [
-          "date",
-          "time",
-          "latitude",
-          "longitude"
-        ],
-        "type": "object"
-      }
-    },
-    "required": [
-      "natal"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "aspectAngles": {
-        "items": {
-          "anyOf": [
-            {
-              "maximum": 360,
-              "minimum": 0,
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "maxItems": 64,
-        "type": "array"
-      },
-      "endDate": {
-        "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
-        "type": "string"
-      },
-      "maxOrb": {
-        "anyOf": [
-          {
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "startDate": {
-        "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
-        "type": "string"
-      },
-      "transitPlanetIds": {
-        "items": {
-          "anyOf": [
-            {
-              "maximum": 9007199254740991,
-              "minimum": 0,
-              "type": "integer"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "maxItems": 32,
-        "type": "array"
-      }
-    },
-    "required": [
-      "startDate",
-      "endDate"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "description": "Wrapper { natal: ChartInput } used by endpoints that take a base natal plus extra parameters in flat fields.",
+    "properties": {
+      "natal": {
+        "additionalProperties": {
+          "anyOf": [
+            {},
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "description": "Birth data for a single natal chart. Required: date (YYYY-MM-DD), time (HH:mm:ss), latitude and longitude in decimal degrees. The short forms lat, lon, lng and tz are rejected with 400 INVALID_FIELD; pass the full names. timezoneOffset is hours from UTC and defaults to 0, meaning UTC; send timezone instead (an IANA name such as Europe/Kyiv, or auto) and the offset for that date is worked out, summer time included. city is a display label only: nothing here geocodes it, so it never stands in for coordinates. houseSystem is a single Swiss Ephemeris letter, P by default; a name such as \"Placidus\" is refused, and the case matters because I and i are two different Sunshine systems.",
+        "properties": {
+          "ayanamsa": {
+            "description": "Sidereal school by name. Lahiri when omitted. Equivalent to ayanamsaId; send either.",
+            "enum": [
+              "fagan-bradley",
+              "lahiri",
+              "de-luce",
+              "raman",
+              "krishnamurti",
+              "kp",
+              "yukteshwar",
+              "jn-bhasin",
+              "true-citra",
+              "djwhal-khul"
+            ],
+            "type": "string"
+          },
+          "ayanamsaId": {
+            "anyOf": [
+              {
+                "type": "number"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "city": {
+            "default": "",
+            "type": "string"
+          },
+          "cosmogram": {
+            "type": "boolean"
+          },
+          "date": {
+            "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+            "type": "string"
+          },
+          "houseSystem": {
+            "default": "P",
+            "enum": [
+              "P",
+              "K",
+              "R",
+              "C",
+              "E",
+              "W",
+              "B",
+              "M",
+              "O",
+              "A",
+              "T",
+              "V",
+              "D",
+              "F",
+              "G",
+              "H",
+              "I",
+              "i",
+              "L",
+              "N",
+              "Q",
+              "S",
+              "U",
+              "X",
+              "Y"
+            ],
+            "type": "string"
+          },
+          "latitude": {
+            "maximum": 90,
+            "minimum": -90,
+            "type": "number"
+          },
+          "longitude": {
+            "maximum": 180,
+            "minimum": -180,
+            "type": "number"
+          },
+          "name": {
+            "default": "",
+            "type": "string"
+          },
+          "time": {
+            "pattern": "^\\d{2}:\\d{2}(:\\d{2})?$",
+            "type": "string"
+          },
+          "timezone": {
+            "description": "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.",
+            "type": "string"
+          },
+          "timezoneOffset": {
+            "anyOf": [
+              {
+                "maximum": 14,
+                "minimum": -14,
+                "type": "number"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "default": 0,
+            "description": "Hours from UTC at the given moment, not minutes. Fractional zones are hours too: 5.5 for India, 5.75 for Nepal, -3.5 for Newfoundland. Defaults to 0, meaning UTC. Ignored when timezone is sent."
+          },
+          "zodiacType": {
+            "enum": [
+              "tropical",
+              "sidereal"
+            ],
+            "type": "string"
+          }
+        },
+        "required": [
+          "date",
+          "time",
+          "latitude",
+          "longitude"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "natal"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "aspectAngles": {
+        "description": "Subset of 0, 60, 90, 120, 180 (the default is all five). Other angles match nothing and answer 400.",
+        "items": {
+          "anyOf": [
+            {
+              "maximum": 360,
+              "minimum": 0,
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "maxItems": 64,
+        "type": "array"
+      },
+      "endDate": {
+        "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+        "type": "string"
+      },
+      "maxOrb": {
+        "anyOf": [
+          {
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "Accepted and echoed back, but it does not filter anything: every event is an exact hit, found by the sign change of the offset and refined by bisection, so its orb is 0. Must be in (0, 10] if sent."
+      },
+      "startDate": {
+        "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+        "type": "string"
+      },
+      "transitPlanetIds": {
+        "description": "Transiting bodies, ids 0 and 2-9 (Sun, Mercury to Pluto; the Moon is excluded). Default: all nine.",
+        "items": {
+          "anyOf": [
+            {
+              "maximum": 9007199254740991,
+              "minimum": 0,
+              "type": "integer"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "maxItems": 32,
+        "type": "array"
+      }
+    },
+    "required": [
+      "startDate",
+      "endDate"
+    ],
+    "type": "object"
+  }
+]

First observedOct 5, 2026

TDQS

B3.2/5.0

Behavior3/5

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

Annotations already declare readOnly, idempotent, non-destructive, closed-world behavior, so the safety profile is covered. The description adds genuinely useful behavior — one event per exact pass, so a retrograde triple pass yields three events — plus the endpoint and a 100-credit Tier 4 cost, but says nothing about auth, rate limits, or how large a date range may be before results get unwieldy.

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?

The operative sentence is front-loaded and every clause earns its place, particularly the retrograde example that clarifies output cardinality. The bracketed group/endpoint/cost block is compact metadata rather than prose bloat, and only the endpoint line adds little for a local MCP caller.

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?

With a rich 100%-covered schema and an output schema present, the description does not need to restate parameters or return shape. It contributes the one thing structured fields cannot express — what counts as an event — and notes the credit cost; only the absence of scope limits on the date range keeps it from full completeness.

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 100%, with rich field-level notes on timezone handling, ayanamsa, aspectAngles, and transitPlanetIds, so the baseline of 3 applies. The description only implies the startDate/endDate pair through 'in a date range' and adds nothing about the natal input or defaults that the schema does not already state.

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?

States a specific verb and resource: list exact moments of transit-to-natal aspects within a date range. The clause about one event per exact pass, and the retrograde triple-pass example, makes the output semantics unmistakable and implicitly separates it from a generic transit listing, though the sibling astroway_prognostics_transits is never named.

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

Usage Guidelines2/5

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

The description says what the tool returns over a date range but gives no when-to-use guidance, no prerequisites (a natal chart with date, time, and coordinates is required), and no pointer to the alternative transit or forecast calendar tools. The agent must infer selection from the sibling names alone.

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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