astroway-mcp

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by astroway

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TypeScript

Remote

Western Wheel (SVG)

astroway_render_wheel_western

Read-onlyIdempotent

Render Western natal chart wheels as SVG with zodiac signs, houses, planets, and aspect lines server-side, enabling chart images without a browser.

Instructions

Render a Western natal wheel as SVG: signs ring, houses ring, planets, aspect lines. Pure server-side, no browser needed.

[Group: Visualization] [Endpoint: POST /v1/render/wheel-western] [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_wheel_western"
  }
}

Input Schema

Name	Required	Description	Default
`body`	Yes

Output Schema

Name	Required	Description	Default
`svg`	No
`format`	No
`byteLength`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedv1.6.1Nov 9, 2026

changedInput schema / properties / body / anyOf

Previous value: -[
-  {
-    "allOf": [
-      {
-        "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"
-      }
-    ],
-    "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."
-  },
-  {
-    "additionalProperties": false,
-    "description": "A chart you already hold, drawn as is: no birth data, 1 credit.",
-    "properties": {
-      "chart": {
-        "additionalProperties": {
-          "anyOf": [
-            {},
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "description": "The data object of a POST /v1/chart response, sent back to be drawn without computing the chart again (1 credit instead of 10). Extra fields are ignored; planets (1 to 30, longitude 0 to 360), houses (exactly 12 cusps, ascendant, mc) and aspects are read.",
-        "properties": {
-          "aspects": {
-            "items": {
-              "additionalProperties": {
-                "anyOf": [
-                  {},
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "properties": {
-                "orb": {
-                  "maximum": 30,
-                  "minimum": 0,
-                  "type": "number"
-                },
-                "planet1": {
-                  "maxLength": 40,
-                  "minLength": 1,
-                  "type": "string"
-                },
-                "planet2": {
-                  "maxLength": 40,
-                  "minLength": 1,
-                  "type": "string"
-                },
-                "type": {
-                  "anyOf": [
-                    {
-                      "maxLength": 40,
-                      "minLength": 1,
-                      "type": "string"
-                    },
-                    {
-                      "additionalProperties": {
-                        "anyOf": [
-                          {},
-                          {
-                            "type": "null"
-                          }
-                        ]
-                      },
-                      "properties": {
-                        "name": {
-                          "maxLength": 40,
-                          "minLength": 1,
-                          "type": "string"
-                        }
-                      },
-                      "required": [
-                        "name"
-                      ],
-                      "type": "object"
-                    }
-                  ]
-                }
-              },
-              "required": [
-                "planet1",
-                "planet2",
-                "type"
-              ],
-              "type": "object"
-            },
-            "maxItems": 300,
-            "type": "array"
-          },
-          "houses": {
-            "additionalProperties": {
-              "anyOf": [
-                {},
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "properties": {
-              "ascendant": {
-                "maximum": 360,
-                "minimum": 0,
-                "type": "number"
-              },
-              "cusps": {
-                "items": {
-                  "maximum": 360,
-                  "minimum": 0,
-                  "type": "number"
-                },
-                "type": "array"
-              },
-              "mc": {
-                "maximum": 360,
-                "minimum": 0,
-                "type": "number"
-              }
-            },
-            "required": [
-              "cusps",
-              "ascendant",
-              "mc"
-            ],
-            "type": "object"
-          },
-          "planets": {
-            "items": {
-              "additionalProperties": {
-                "anyOf": [
-                  {},
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "properties": {
-                "id": {
-                  "maximum": 100000,
-                  "minimum": -1,
-                  "type": "integer"
-                },
-                "isRetrograde": {
-                  "type": "boolean"
-                },
-                "longitude": {
-                  "maximum": 360,
-                  "minimum": 0,
-                  "type": "number"
-                },
-                "name": {
-                  "maxLength": 40,
-                  "minLength": 1,
-                  "type": "string"
-                },
-                "speedLong": {
-                  "maximum": 30,
-                  "minimum": -30,
-                  "type": "number"
-                }
-              },
-              "required": [
-                "id",
-                "name",
-                "longitude"
-              ],
-              "type": "object"
-            },
-            "maxItems": 30,
-            "minItems": 1,
-            "type": "array"
-          }
-        },
-        "required": [
-          "planets",
-          "houses"
-        ],
-        "type": "object"
-      },
-      "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"
-      }
-    },
-    "required": [
-      "chart"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "allOf": [
+      {
+        "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"
+      }
+    ],
+    "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."
+  },
+  {
+    "additionalProperties": false,
+    "description": "A chart you already hold, drawn as is: no birth data, 1 credit.",
+    "properties": {
+      "chart": {
+        "additionalProperties": {
+          "anyOf": [
+            {},
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "description": "The data object of a POST /v1/chart response, sent back to be drawn without computing the chart again (1 credit instead of 10). Extra fields are ignored; planets (1 to 30, longitude 0 to 360), houses (exactly 12 cusps, ascendant, mc) and aspects are read.",
+        "properties": {
+          "aspects": {
+            "items": {
+              "additionalProperties": {
+                "anyOf": [
+                  {},
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "properties": {
+                "orb": {
+                  "maximum": 30,
+                  "minimum": 0,
+                  "type": "number"
+                },
+                "planet1": {
+                  "maxLength": 40,
+                  "minLength": 1,
+                  "type": "string"
+                },
+                "planet2": {
+                  "maxLength": 40,
+                  "minLength": 1,
+                  "type": "string"
+                },
+                "type": {
+                  "anyOf": [
+                    {
+                      "maxLength": 40,
+                      "minLength": 1,
+                      "type": "string"
+                    },
+                    {
+                      "additionalProperties": {
+                        "anyOf": [
+                          {},
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      },
+                      "properties": {
+                        "name": {
+                          "maxLength": 40,
+                          "minLength": 1,
+                          "type": "string"
+                        }
+                      },
+                      "required": [
+                        "name"
+                      ],
+                      "type": "object"
+                    }
+                  ]
+                }
+              },
+              "required": [
+                "planet1",
+                "planet2",
+                "type"
+              ],
+              "type": "object"
+            },
+            "maxItems": 300,
+            "type": "array"
+          },
+          "houses": {
+            "additionalProperties": {
+              "anyOf": [
+                {},
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "properties": {
+              "ascendant": {
+                "maximum": 360,
+                "minimum": 0,
+                "type": "number"
+              },
+              "cusps": {
+                "items": {
+                  "maximum": 360,
+                  "minimum": 0,
+                  "type": "number"
+                },
+                "type": "array"
+              },
+              "mc": {
+                "maximum": 360,
+                "minimum": 0,
+                "type": "number"
+              }
+            },
+            "required": [
+              "cusps",
+              "ascendant",
+              "mc"
+            ],
+            "type": "object"
+          },
+          "planets": {
+            "items": {
+              "additionalProperties": {
+                "anyOf": [
+                  {},
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "properties": {
+                "id": {
+                  "maximum": 100000,
+                  "minimum": -1,
+                  "type": "integer"
+                },
+                "isRetrograde": {
+                  "type": "boolean"
+                },
+                "longitude": {
+                  "maximum": 360,
+                  "minimum": 0,
+                  "type": "number"
+                },
+                "name": {
+                  "maxLength": 40,
+                  "minLength": 1,
+                  "type": "string"
+                },
+                "speedLong": {
+                  "maximum": 30,
+                  "minimum": -30,
+                  "type": "number"
+                }
+              },
+              "required": [
+                "id",
+                "name",
+                "longitude"
+              ],
+              "type": "object"
+            },
+            "maxItems": 30,
+            "minItems": 1,
+            "type": "array"
+          }
+        },
+        "required": [
+          "planets",
+          "houses"
+        ],
+        "type": "object"
+      },
+      "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"
+      }
+    },
+    "required": [
+      "chart"
+    ],
+    "type": "object"
+  }
+]

Addedv1.6.0Oct 24, 2026

TDQS

B3.2/5.0

Behavior3/5

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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so safety is covered. The description adds genuinely useful context the annotations cannot: output is SVG produced entirely server-side with no browser, and a call costs 10 credits at Tier 1. It does not mention that a precomputed chart input drops the cost to 1 credit, which is the single most behaviorally relevant fact.

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 prose is two tight sentences, front-loaded with the verb and resource, with zero filler. The bracketed Group/Endpoint/Cost lines are boilerplate but short and factual, so they do not meaningfully dilute the definition.

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?

This tool has a complex schema: the body accepts either raw birth data or an already-computed chart, and there is a large options object. The description covers the output only and omits the two-input-mode choice and the 10-vs-1 credit consequence. An output schema exists, so return values need no explanation, but the input duality is a real gap for a render tool.

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?

The description says nothing about the single body parameter or its dual shape, but the schema's nested branches are themselves heavily documented (timezone vs timezoneOffset, houseSystem letter rules, theme css variables, the chart passthrough with 12 cusps). The schema does the work, so this lands at the baseline rather than below it, but the description contributes no additional parameter 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 ('Render a Western natal wheel as SVG') and enumerates what the image contains (signs ring, houses ring, planets, aspect lines). The word 'Western' implicitly separates it from the Vedic wheel siblings. It stops short of naming an alternative outright, so sibling differentiation is inferred rather than stated.

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 when-to-use guidance at all: nothing says when to pick this over astroway_render_wheel_vedic_east, astroway_render_bi_wheel, astroway_render_aspect_grid, or the underlying astroway_western_chart. The only hint is the trailing metadata block (group, endpoint, cost), which is billing context rather than decision 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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