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astroway-mcp

Official
by astroway

Cosmogram: Hamburg School 90° dial (SVG)

astroway_render_cosmogram
Read-onlyIdempotent

Generate a Cosmobiology 90° dial from birth data, plotting planets by longitude modulo 90° across four quadrants to reveal cardinal, fixed, and mutable patterns.

Instructions

Cosmobiology 90° dial. Plots planets at (longitude mod 90)° across 4 quadrants, Cardinal/Fixed/Mutable repeated.

[Group: Visualization] [Endpoint: POST /v1/render/cosmogram] [Cost: 10 credits (Tier 1)]

Tool call template

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

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

Input Schema

NameRequiredDescriptionDefault
bodyYesBirth 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.

Output Schema

NameRequiredDescriptionDefault
svgNo
formatNo
byteLengthNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changedv1.6.1
    • 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": {
      -        "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": {
      -      "options": {
      -        "properties": {
      -          "bodies": {
      -            "items": {
      -              "enum": [
      -                "Sun",
      -                "Moon",
      -                "Mercury",
      -                "Venus",
      -                "Mars",
      -                "Jupiter",
      -                "Saturn",
      -                "Uranus",
      -                "Neptune",
      -                "Pluto",
      -                "North Node",
      -                "South Node",
      -                "Chiron",
      -                "Lilith"
      -              ],
      -              "type": "string"
      -            },
      -            "maxItems": 14,
      -            "minItems": 1,
      -            "type": "array"
      -          },
      -          "format": {
      -            "default": "json",
      -            "enum": [
      -              "svg",
      -              "json"
      -            ],
      -            "type": "string"
      -          },
      -          "labels": {
      -            "additionalProperties": false,
      -            "description": "Your own words in place of the English the image would otherwise carry: the ASC/DSC/MC/IC axis labels, the SVG <title> and <desc> read by screen readers, and the planet and sign names plus the word for retrograde in each planet's data-label (theme css). bodies is keyed by the English name, signs lists twelve names from Aries. Nothing is translated for you; absent keys keep the English.",
      -            "properties": {
      -              "asc": {
      -                "maxLength": 40,
      -                "minLength": 1,
      -                "type": "string"
      -              },
      -              "bodies": {
      -                "properties": {
      -                  "Chiron": {
      -                    "maxLength": 40,
      -                    "minLength": 1,
      -                    "type": "string"
      -                  },
      -                  "Jupiter": {
      -                    "maxLength": 40,
      -                    "minLength": 1,
      -                    "type": "string"
      -                  },
      -                  "Lilith": {
      -                    "maxLength": 40,
      -                    "minLength": 1,
      -                    "type": "string"
      -                  },
      -                  "Mars": {
      -                    "maxLength": 40,
      -                    "minLength": 1,
      -                    "type": "string"
      -                  },
      -                  "Mercury": {
      -                    "maxLength": 40,
      -                    "minLength": 1,
      -                    "type": "string"
      -                  },
      -                  "Moon": {
      -                    "maxLength": 40,
      -                    "minLength": 1,
      -                    "type": "string"
      -                  },
      -                  "Neptune": {
      -                    "maxLength": 40,
      -                    "minLength": 1,
      -                    "type": "string"
      -                  },
      -                  "North Node": {
      -                    "maxLength": 40,
      -                    "minLength": 1,
      -                    "type": "string"
      -                  },
      -                  "Pluto": {
      -                    "maxLength": 40,
      -                    "minLength": 1,
      -                    "type": "string"
      -                  },
      -                  "Saturn": {
      -                    "maxLength": 40,
      -                    "minLength": 1,
      -                    "type": "string"
      -                  },
      -                  "South Node": {
      -                    "maxLength": 40,
      -                    "minLength": 1,
      -                    "type": "string"
      -                  },
      -                  "Sun": {
      -                    "maxLength": 40,
      -                    "minLength": 1,
      -                    "type": "string"
      -                  },
      -                  "Uranus": {
      -                    "maxLength": 40,
      -                    "minLength": 1,
      -                    "type": "string"
      -                  },
      -                  "Venus": {
      -                    "maxLength": 40,
      -                    "minLength": 1,
      -                    "type": "string"
      -                  }
      -                },
      -                "type": "object"
      -              },
      -              "desc": {
      -                "maxLength": 2000,
      -                "minLength": 1,
      -                "type": "string"
      -              },
      -              "dsc": {
      -                "maxLength": 40,
      -                "minLength": 1,
      -                "type": "string"
      -              },
      -              "ic": {
      -                "maxLength": 40,
      -                "minLength": 1,
      -                "type": "string"
      -              },
      -              "mc": {
      -                "maxLength": 40,
      -                "minLength": 1,
      -                "type": "string"
      -              },
      -              "retrograde": {
      -                "maxLength": 40,
      -                "minLength": 1,
      -                "type": "string"
      -              },
      -              "signs": {
      -                "items": {
      -                  "maxLength": 40,
      -                  "minLength": 1,
      -                  "type": "string"
      -                },
      -                "type": "array"
      -              },
      -              "title": {
      -                "maxLength": 200,
      -                "minLength": 1,
      -                "type": "string"
      -              }
      -            },
      -            "type": "object"
      -          },
      -          "showAspects": {
      -            "type": "boolean"
      -          },
      -          "showRetrograde": {
      -            "type": "boolean"
      -          },
      -          "size": {
      -            "maximum": 2000,
      -            "minimum": 200,
      -            "type": "integer"
      -          },
      -          "theme": {
      -            "description": "css paints every colour as var(--aw-<role>, <light colour>), so the page that inlines the SVG can recolour it with CSS custom properties (--aw-chart-bg, --aw-fg, --aw-muted, --aw-ring, --aw-houses-fill, --aw-benefic, --aw-malefic, --aw-aspect-harmonious, --aw-aspect-tense, --aw-aspect-neutral, --aw-aspect-minor, --aw-aspect-quintile, --aw-moon-shadow, --aw-moon-light, --aw-cycle-physical, --aw-cycle-emotional, --aw-cycle-intellectual). With none set it looks exactly like light. Inside an <img> the variables cannot be set, so it stays light. The Western wheels and the aspect grid then also carry stable aw-* classes, and each planet is a <g> with data-planet and data-label, each aspect line has data-a and data-b; see the @astroway/render changelog for the list.",
      -            "enum": [
      -              "light",
      -              "dark",
      -              "console",
      -              "css"
      -            ],
      -            "type": "string"
      -          },
      -          "title": {
      -            "maxLength": 120,
      -            "type": "string"
      -          }
      -        },
      -        "type": "object"
      -      }
      -    },
      -    "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": {
      +      "options": {
      +        "properties": {
      +          "bodies": {
      +            "items": {
      +              "enum": [
      +                "Sun",
      +                "Moon",
      +                "Mercury",
      +                "Venus",
      +                "Mars",
      +                "Jupiter",
      +                "Saturn",
      +                "Uranus",
      +                "Neptune",
      +                "Pluto",
      +                "North Node",
      +                "South Node",
      +                "Chiron",
      +                "Lilith"
      +              ],
      +              "type": "string"
      +            },
      +            "maxItems": 14,
      +            "minItems": 1,
      +            "type": "array"
      +          },
      +          "format": {
      +            "default": "json",
      +            "enum": [
      +              "svg",
      +              "json"
      +            ],
      +            "type": "string"
      +          },
      +          "labels": {
      +            "additionalProperties": false,
      +            "description": "Your own words in place of the English the image would otherwise carry: the ASC/DSC/MC/IC axis labels, the SVG <title> and <desc> read by screen readers, and the planet and sign names plus the word for retrograde in each planet's data-label (theme css). bodies is keyed by the English name, signs lists twelve names from Aries. Nothing is translated for you; absent keys keep the English.",
      +            "properties": {
      +              "asc": {
      +                "maxLength": 40,
      +                "minLength": 1,
      +                "type": "string"
      +              },
      +              "bodies": {
      +                "properties": {
      +                  "Chiron": {
      +                    "maxLength": 40,
      +                    "minLength": 1,
      +                    "type": "string"
      +                  },
      +                  "Jupiter": {
      +                    "maxLength": 40,
      +                    "minLength": 1,
      +                    "type": "string"
      +                  },
      +                  "Lilith": {
      +                    "maxLength": 40,
      +                    "minLength": 1,
      +                    "type": "string"
      +                  },
      +                  "Mars": {
      +                    "maxLength": 40,
      +                    "minLength": 1,
      +                    "type": "string"
      +                  },
      +                  "Mercury": {
      +                    "maxLength": 40,
      +                    "minLength": 1,
      +                    "type": "string"
      +                  },
      +                  "Moon": {
      +                    "maxLength": 40,
      +                    "minLength": 1,
      +                    "type": "string"
      +                  },
      +                  "Neptune": {
      +                    "maxLength": 40,
      +                    "minLength": 1,
      +                    "type": "string"
      +                  },
      +                  "North Node": {
      +                    "maxLength": 40,
      +                    "minLength": 1,
      +                    "type": "string"
      +                  },
      +                  "Pluto": {
      +                    "maxLength": 40,
      +                    "minLength": 1,
      +                    "type": "string"
      +                  },
      +                  "Saturn": {
      +                    "maxLength": 40,
      +                    "minLength": 1,
      +                    "type": "string"
      +                  },
      +                  "South Node": {
      +                    "maxLength": 40,
      +                    "minLength": 1,
      +                    "type": "string"
      +                  },
      +                  "Sun": {
      +                    "maxLength": 40,
      +                    "minLength": 1,
      +                    "type": "string"
      +                  },
      +                  "Uranus": {
      +                    "maxLength": 40,
      +                    "minLength": 1,
      +                    "type": "string"
      +                  },
      +                  "Venus": {
      +                    "maxLength": 40,
      +                    "minLength": 1,
      +                    "type": "string"
      +                  }
      +                },
      +                "type": "object"
      +              },
      +              "desc": {
      +                "maxLength": 2000,
      +                "minLength": 1,
      +                "type": "string"
      +              },
      +              "dsc": {
      +                "maxLength": 40,
      +                "minLength": 1,
      +                "type": "string"
      +              },
      +              "ic": {
      +                "maxLength": 40,
      +                "minLength": 1,
      +                "type": "string"
      +              },
      +              "mc": {
      +                "maxLength": 40,
      +                "minLength": 1,
      +                "type": "string"
      +              },
      +              "retrograde": {
      +                "maxLength": 40,
      +                "minLength": 1,
      +                "type": "string"
      +              },
      +              "signs": {
      +                "items": {
      +                  "maxLength": 40,
      +                  "minLength": 1,
      +                  "type": "string"
      +                },
      +                "type": "array"
      +              },
      +              "title": {
      +                "maxLength": 200,
      +                "minLength": 1,
      +                "type": "string"
      +              }
      +            },
      +            "type": "object"
      +          },
      +          "showAspects": {
      +            "type": "boolean"
      +          },
      +          "showRetrograde": {
      +            "type": "boolean"
      +          },
      +          "size": {
      +            "maximum": 2000,
      +            "minimum": 200,
      +            "type": "integer"
      +          },
      +          "theme": {
      +            "description": "css paints every colour as var(--aw-<role>, <light colour>), so the page that inlines the SVG can recolour it with CSS custom properties (--aw-chart-bg, --aw-fg, --aw-muted, --aw-ring, --aw-houses-fill, --aw-benefic, --aw-malefic, --aw-aspect-harmonious, --aw-aspect-tense, --aw-aspect-neutral, --aw-aspect-minor, --aw-aspect-quintile, --aw-moon-shadow, --aw-moon-light, --aw-cycle-physical, --aw-cycle-emotional, --aw-cycle-intellectual). With none set it looks exactly like light. Inside an <img> the variables cannot be set, so it stays light. The Western wheels and the aspect grid then also carry stable aw-* classes, and each planet is a <g> with data-planet and data-label, each aspect line has data-a and data-b; see the @astroway/render changelog for the list.",
      +            "enum": [
      +              "light",
      +              "dark",
      +              "console",
      +              "css"
      +            ],
      +            "type": "string"
      +          },
      +          "title": {
      +            "maxLength": 120,
      +            "type": "string"
      +          }
      +        },
      +        "type": "object"
      +      }
      +    },
      +    "type": "object"
      +  }
      +]
    • changedInput schema / properties / body / description
      Previous value: -"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."New value: +"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."
  2. Addedv1.6.0

TDQS

B3.2/5.0
Behavior3/5

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

Annotations already declare read-only, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds genuinely useful non-schema context: the endpoint and the 10-credit Tier 1 cost, which matters for an agent deciding whether to call it. It does not mention that the tool defaults to JSON output rather than the SVG the title advertises, which is a meaningful behavioral gap.

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 substantive content is two tight sentences, front-loaded with the identifying phrase and the geometric rule. The bracketed Group/Endpoint/Cost lines are boilerplate but each carries a fact an agent can use, and the cost line is the only place pricing appears.

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

Completeness3/5

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

An output schema exists and the input schema is very rich, so most of the burden is already carried elsewhere. Still missing: any differentiation from the two similarly named cosmobiology siblings, and any hint that format defaults to 'json' so an SVG requires an explicit option — an agent could reasonably expect an image from the title.

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 single 'body' parameter is exhaustively documented in the schema, including theme, labels, format and timezone handling. The description adds nothing about parameters, which is acceptable at this coverage level but contributes no extra meaning.

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 ('Cosmobiology 90° dial') and explains the plotting rule: planets placed at longitude mod 90 across four quadrants with Cardinal/Fixed/Mutable repeated. An agent can tell this is a dial renderer, though nothing distinguishes it from the near-identically named siblings astroway_cosmobiology_dial_90 and astroway_cosmobiology_cosmogram.

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?

No when-to-use guidance at all. With siblings named 'cosmobiology_dial_90' and 'cosmobiology_cosmogram' in the catalog, an agent has no basis for choosing this renderer over those; the description never says whether it renders or computes, or when to prefer one.

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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