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AstroWay Astrology API (full catalogue)

Primary Directions

astroway_prognostics_primary_directions
Read-onlyIdempotent

Calculate primary directions (Ptolemaic or Regiomontanus) up to a maximum age. Returns a timeline of directed aspect hits.

[Group: Prognostics] [Endpoint: POST /v1/primary-directions] [Cost: 50 credits (Tier 3)]

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_primary_directions"
  }
}

Input Schema

NameRequiredDescriptionDefault
bodyYesNatal chart plus the directional rate in degrees per year (Naibod 0.9856353 by default), the age to search to, and the aspect angles to test.
fieldsNoCompact mode: comma-separated dotted paths to keep, relative to `data`, e.g. "planets.name,planets.longitude,houses.cusp". Omit for the whole response.
precisionNoCompact mode: round fractional numbers to this many decimals. Longitudes carry 14 by default; 2 is finer than any chart is drawn.

Output Schema

NameRequiredDescriptionDefault
directionsNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changed
    • changedInput schema / properties / body / allOf
      Previous value: -[
      -  {
      -    "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"
      -  },
      -  {
      -    "additionalProperties": {
      -      "anyOf": [
      -        {},
      -        {
      -          "type": "null"
      -        }
      -      ]
      -    },
      -    "properties": {
      -      "aspectAngles": {
      -        "items": {
      -          "anyOf": [
      -            {
      -              "maximum": 180,
      -              "minimum": 0,
      -              "type": "number"
      -            },
      -            {
      -              "type": "null"
      -            }
      -          ]
      -        },
      -        "maxItems": 64,
      -        "type": "array"
      -      },
      -      "key": {
      -        "exclusiveMinimum": 0,
      -        "maximum": 2,
      -        "type": "number"
      -      },
      -      "maxAge": {
      -        "exclusiveMinimum": 0,
      -        "maximum": 120,
      -        "type": "integer"
      -      }
      -    },
      -    "type": "object"
      -  }
      -]New value: +[
      +  {
      +    "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"
      +  },
      +  {
      +    "additionalProperties": {
      +      "anyOf": [
      +        {},
      +        {
      +          "type": "null"
      +        }
      +      ]
      +    },
      +    "properties": {
      +      "aspectAngles": {
      +        "items": {
      +          "anyOf": [
      +            {
      +              "maximum": 180,
      +              "minimum": 0,
      +              "type": "number"
      +            },
      +            {
      +              "type": "null"
      +            }
      +          ]
      +        },
      +        "maxItems": 64,
      +        "type": "array"
      +      },
      +      "key": {
      +        "exclusiveMinimum": 0,
      +        "maximum": 2,
      +        "type": "number"
      +      },
      +      "maxAge": {
      +        "exclusiveMinimum": 0,
      +        "maximum": 120,
      +        "type": "integer"
      +      }
      +    },
      +    "type": "object"
      +  }
      +]
    • changedOutput schema / properties / directions / anyOf
      Previous value: -[
      -  {
      -    "items": {
      -      "anyOf": [
      -        {
      -          "additionalProperties": {},
      -          "properties": {
      -            "ageYears": {
      -              "anyOf": [
      -                {
      -                  "type": "number"
      -                },
      -                {
      -                  "type": "null"
      -                }
      -              ]
      -            },
      -            "arc": {
      -              "anyOf": [
      -                {
      -                  "type": "number"
      -                },
      -                {
      -                  "type": "null"
      -                }
      -              ]
      -            },
      -            "aspectAngle": {
      -              "anyOf": [
      -                {
      -                  "type": "number"
      -                },
      -                {
      -                  "type": "null"
      -                }
      -              ]
      -            },
      -            "isDirect": {
      -              "anyOf": [
      -                {
      -                  "type": "boolean"
      -                },
      -                {
      -                  "type": "null"
      -                }
      -              ]
      -            },
      -            "promissor": {
      -              "anyOf": [
      -                {
      -                  "type": "string"
      -                },
      -                {
      -                  "type": "null"
      -                }
      -              ]
      -            },
      -            "promissorId": {
      -              "anyOf": [
      -                {
      -                  "type": "number"
      -                },
      -                {
      -                  "type": "null"
      -                }
      -              ]
      -            },
      -            "significator": {
      -              "anyOf": [
      -                {
      -                  "type": "string"
      -                },
      -                {
      -                  "type": "null"
      -                }
      -              ]
      -            },
      -            "significatorId": {
      -              "anyOf": [
      -                {
      -                  "type": "number"
      -                },
      -                {
      -                  "type": "null"
      -                }
      -              ]
      -            }
      -          },
      -          "type": "object"
      -        },
      -        {
      -          "type": "null"
      -        }
      -      ]
      -    },
      -    "type": "array"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]New value: +[
      +  {
      +    "items": {
      +      "anyOf": [
      +        {
      +          "additionalProperties": {},
      +          "properties": {
      +            "ageYears": {
      +              "type": [
      +                "number",
      +                "null"
      +              ]
      +            },
      +            "arc": {
      +              "type": [
      +                "number",
      +                "null"
      +              ]
      +            },
      +            "aspectAngle": {
      +              "type": [
      +                "number",
      +                "null"
      +              ]
      +            },
      +            "isDirect": {
      +              "type": [
      +                "boolean",
      +                "null"
      +              ]
      +            },
      +            "promissor": {
      +              "type": [
      +                "string",
      +                "null"
      +              ]
      +            },
      +            "promissorId": {
      +              "type": [
      +                "number",
      +                "null"
      +              ]
      +            },
      +            "significator": {
      +              "type": [
      +                "string",
      +                "null"
      +              ]
      +            },
      +            "significatorId": {
      +              "type": [
      +                "number",
      +                "null"
      +              ]
      +            }
      +          },
      +          "type": "object"
      +        },
      +        {
      +          "type": "null"
      +        }
      +      ]
      +    },
      +    "type": "array"
      +  },
      +  {
      +    "type": "null"
      +  }
      +]
  2. Changed1 schema field changed
    • changedInput schema / properties / body / allOf
      Previous value: -[
      -  {
      -    "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"
      -  },
      -  {
      -    "additionalProperties": {
      -      "anyOf": [
      -        {},
      -        {
      -          "type": "null"
      -        }
      -      ]
      -    },
      -    "properties": {
      -      "aspectAngles": {
      -        "items": {
      -          "anyOf": [
      -            {
      -              "maximum": 180,
      -              "minimum": 0,
      -              "type": "number"
      -            },
      -            {
      -              "type": "null"
      -            }
      -          ]
      -        },
      -        "maxItems": 64,
      -        "type": "array"
      -      },
      -      "key": {
      -        "exclusiveMinimum": 0,
      -        "maximum": 2,
      -        "type": "number"
      -      },
      -      "maxAge": {
      -        "exclusiveMinimum": 0,
      -        "maximum": 120,
      -        "type": "integer"
      -      }
      -    },
      -    "type": "object"
      -  }
      -]New value: +[
      +  {
      +    "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"
      +  },
      +  {
      +    "additionalProperties": {
      +      "anyOf": [
      +        {},
      +        {
      +          "type": "null"
      +        }
      +      ]
      +    },
      +    "properties": {
      +      "aspectAngles": {
      +        "items": {
      +          "anyOf": [
      +            {
      +              "maximum": 180,
      +              "minimum": 0,
      +              "type": "number"
      +            },
      +            {
      +              "type": "null"
      +            }
      +          ]
      +        },
      +        "maxItems": 64,
      +        "type": "array"
      +      },
      +      "key": {
      +        "exclusiveMinimum": 0,
      +        "maximum": 2,
      +        "type": "number"
      +      },
      +      "maxAge": {
      +        "exclusiveMinimum": 0,
      +        "maximum": 120,
      +        "type": "integer"
      +      }
      +    },
      +    "type": "object"
      +  }
      +]
  3. First observed

TDQS

A3.5/5.0
Behavior4/5

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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered; the description adds genuinely new context by disclosing the return content ("a timeline of directed aspect hits"), the transport (POST /v1/primary-directions), and the cost (50 credits, Tier 3). The one gap is that it advertises a choice of "Ptolemaic or Regiomontanus" without saying how that choice is made at call time.

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?

Two front-loaded sentences state the operation and the return value, followed by compact bracketed metadata for group, endpoint, and cost. Nothing is padded, though the metadata block is boilerplate rather than explanatory content.

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 an output schema present, the description needn't detail return values, and annotations plus rich nested schema descriptions cover the natal-input requirements. Cost and endpoint disclosure round it out; the only substantive omission is how the Ptolemaic/Regiomontanus option is actually selected.

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%, so the baseline is 3; the description only loosely maps to parameters, with "up to a maximum age" clearly corresponding to maxAge. It adds no meaning for the opaque `key` parameter, and its mention of two directional systems does not map to any visible field, leaving that selection ambiguous.

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 states a specific verb and resource ("Calculate primary directions") and names the two supported systems ("Ptolemaic or Regiomontanus"), which is enough to tell it apart from siblings such as symbolic directions or progressions by technique name. However, it never explicitly contrasts itself with those adjacent prognostics tools, so the differentiation is left to the reader's domain knowledge.

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?

There is no statement of when to choose primary directions over astroway_prognostics_symbolic_directions, progressions, or profections, and no prerequisites or exclusions. The phrase "up to a maximum age" scopes the calculation but is not usage guidance.

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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