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astroway-mcp

Official
by astroway

Synastry Interpretation

astroway_ai_interpret_synastry
Read-only

Interpret synastry between two natal charts to understand relationship dynamics, attractions, friction points, and long-term outlook.

Instructions

AI interpretation of synastry between two charts: relationship dynamics, attractions, friction points, long-term outlook.

[Group: AI Interpretations] [Endpoint: POST /v1/interpret/synastry] [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_ai_interpret_synastry"
  }
}

Input Schema

NameRequiredDescriptionDefault
bodyYesPair of natal charts for relationship calculations: synastry, composite, davison.

Output Schema

NameRequiredDescriptionDefault
modelNo
languageNo
disclaimerNo
interpretationNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changedv1.6.1
    • changedInput schema / properties / body / allOf
      Previous value: -[
      -  {
      -    "description": "Pair of natal charts for relationship calculations: synastry, composite, davison.",
      -    "properties": {
      -      "chart1": {
      -        "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": {
      -            "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"
      -      },
      -      "chart2": {
      -        "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": {
      -            "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": [
      -      "chart1",
      -      "chart2"
      -    ],
      -    "type": "object"
      -  },
      -  {
      -    "properties": {
      -      "disclaimer_inline": {
      -        "default": false,
      -        "type": "boolean"
      -      },
      -      "language": {
      -        "enum": [
      -          "uk",
      -          "en",
      -          "de",
      -          "pl",
      -          "es",
      -          "pt",
      -          "fr",
      -          "it",
      -          "nl",
      -          "cs",
      -          "ro",
      -          "hu",
      -          "el",
      -          "tr",
      -          "ar",
      -          "hi",
      -          "ja",
      -          "ko",
      -          "vi",
      -          "id",
      -          "ru"
      -        ],
      -        "type": "string"
      -      }
      -    },
      -    "type": "object"
      -  }
      -]New value: +[
      +  {
      +    "description": "Pair of natal charts for relationship calculations: synastry, composite, davison.",
      +    "properties": {
      +      "chart1": {
      +        "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"
      +      },
      +      "chart2": {
      +        "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": [
      +      "chart1",
      +      "chart2"
      +    ],
      +    "type": "object"
      +  },
      +  {
      +    "properties": {
      +      "disclaimer_inline": {
      +        "default": false,
      +        "type": "boolean"
      +      },
      +      "language": {
      +        "enum": [
      +          "uk",
      +          "en",
      +          "de",
      +          "pl",
      +          "es",
      +          "pt",
      +          "fr",
      +          "it",
      +          "nl",
      +          "cs",
      +          "ro",
      +          "hu",
      +          "el",
      +          "tr",
      +          "ar",
      +          "hi",
      +          "ja",
      +          "ko",
      +          "vi",
      +          "id",
      +          "ru"
      +        ],
      +        "type": "string"
      +      }
      +    },
      +    "type": "object"
      +  }
      +]
  2. Addedv1.6.0

TDQS

A3.7/5.0
Behavior4/5

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

Annotations already declare readOnly, open-world, and non-idempotent, so the safety profile is covered. The description adds genuinely new operational context: the POST endpoint and a concrete price of 100 credits (Tier 4), which matters because the annotation says the call is not idempotent and therefore repeatable at cost. It does not state whether results are deterministic or cached.

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?

One front-loaded sentence stating the deliverable, followed by three compact bracketed metadata lines for group, endpoint, and cost. Every line earns its place; the only mild redundancy is that the group label largely restates the tool's family.

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?

For a single-parameter tool with a fully documented schema and an output schema, the description covers what it produces and what it costs. Minor gaps: no mention of the optional language and disclaimer_inline fields, and no routing hint among the many synastry siblings, but nothing required to invoke it correctly is missing.

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% and the nested body schema is unusually well documented (date/time formats, coordinate ranges, timezone rules, house-system letters). The description adds nothing about the request body, which is acceptable given the schema does the heavy lifting, but means no value beyond the structured fields.

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-and-resource pair ('AI interpretation of synastry between two charts') and enumerates the content produced (relationship dynamics, attractions, friction points, long-term outlook). It clearly reads as a narrative/interpretive tool rather than the raw-data relational siblings, though it never names a specific alternative to contrast with.

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 by the tool's framing: reach for it when a written relationship reading is wanted. There is no explicit when-to-use, no when-not-to-use, and no pointer to astroway_relational_synastry or the synastry narrative siblings. The credit cost line at least signals this is a heavyweight call worth spending deliberately.

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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