AstroWay Astrology API (full catalogue)

Aspect Bars (Gantt)

astroway_aspects_aspect_bar

Read-onlyIdempotent

Transform aspect timelines into Gantt-style bars grouped by transit planet. Each bar shows the duration an aspect is in orb, with exact dates marked. Useful for visual transit calendars.

[Group: Aspects & Points] [Endpoint: POST /v1/aspect-bar] [Required: startDate, endDate] [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": {
      "startDate": "<startDate>",
      "endDate": "<endDate>"
    },
    "name": "astroway_aspects_aspect_bar"
  }
}

Input Schema

Name	Required	Description
`fields`	No	Compact mode: comma-separated dotted paths to keep, relative to `data`, e.g. "planets.name,planets.longitude,houses.cusp". Omit for the whole response.
`maxOrb`	No
`endDate`	Yes
`stepDays`	No
`precision`	No	Compact mode: round fractional numbers to this many decimals. Longitudes carry 14 by default; 2 is finer than any chart is drawn.
`startDate`	Yes
`planet1Ids`	No
`planet2Ids`	No
`aspectAngles`	No
`visiblePlanetIds`	No

Output Schema

Name	Required	Description	Default
`bars`	No
`rows`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed3 schema fields changedNov 7, 2026

changedOutput schema / properties / bars / anyOf

Previous value: -[
-  {
-    "additionalProperties": {},
-    "properties": {
-      "rows": {
-        "anyOf": [
-          {
-            "items": {
-              "anyOf": [
-                {
-                  "additionalProperties": {},
-                  "properties": {
-                    "bars": {
-                      "anyOf": [
-                        {
-                          "items": {
-                            "anyOf": [
-                              {
-                                "additionalProperties": {},
-                                "properties": {
-                                  "aspect": {
-                                    "anyOf": [
-                                      {
-                                        "additionalProperties": {},
-                                        "properties": {
-                                          "angle": {
-                                            "anyOf": [
-                                              {
-                                                "type": "number"
-                                              },
-                                              {
-                                                "type": "null"
-                                              }
-                                            ]
-                                          },
-                                          "color": {
-                                            "anyOf": [
-                                              {
-                                                "type": "string"
-                                              },
-                                              {
-                                                "type": "null"
-                                              }
-                                            ]
-                                          },
-                                          "i18nKey": {
-                                            "anyOf": [
-                                              {
-                                                "type": "string"
-                                              },
-                                              {
-                                                "type": "null"
-                                              }
-                                            ]
-                                          },
-                                          "isMajor": {
-                                            "anyOf": [
-                                              {
-                                                "type": "boolean"
-                                              },
-                                              {
-                                                "type": "null"
-                                              }
-                                            ]
-                                          },
-                                          "name": {
-                                            "anyOf": [
-                                              {
-                                                "type": "string"
-                                              },
-                                              {
-                                                "type": "null"
-                                              }
-                                            ]
-                                          },
-                                          "orb": {
-                                            "anyOf": [
-                                              {
-                                                "type": "number"
-                                              },
-                                              {
-                                                "type": "null"
-                                              }
-                                            ]
-                                          },
-                                          "symbol": {
-                                            "anyOf": [
-                                              {
-                                                "type": "string"
-                                              },
-                                              {
-                                                "type": "null"
-                                              }
-                                            ]
-                                          }
-                                        },
-                                        "type": "object"
-                                      },
-                                      {
-                                        "type": "null"
-                                      }
-                                    ]
-                                  },
-                                  "endDate": {
-                                    "anyOf": [
-                                      {
-                                        "type": "string"
-                                      },
-                                      {
-                                        "type": "null"
-                                      }
-                                    ]
-                                  },
-                                  "endJd": {
-                                    "anyOf": [
-                                      {
-                                        "type": "number"
-                                      },
-                                      {
-                                        "type": "null"
-                                      }
-                                    ]
-                                  },
-                                  "exactDates": {
-                                    "anyOf": [
-                                      {
-                                        "items": {
-                                          "anyOf": [
-                                            {
-                                              "additionalProperties": {},
-                                              "properties": {
-                                                "date": {
-                                                  "anyOf": [
-                                                    {
-                                                      "type": "string"
-                                                    },
-                                                    {
-                                                      "type": "null"
-                                                    }
-                                                  ]
-                                                },
-                                                "jd": {
-                                                  "anyOf": [
-                                                    {
-                                                      "type": "number"
-                                                    },
-                                                    {
-                                                      "type": "null"
-                                                    }
-                                                  ]
-                                                }
-                                              },
-                                              "type": "object"
-                                            },
-                                            {
-                                              "type": "null"
-                                            }
-                                          ]
-                                        },
-                                        "type": "array"
-                                      },
-                                      {
-                                        "type": "null"
-                                      }
-                                    ]
-                                  },
-                                  "lane": {
-                                    "anyOf": [
-                                      {
-                                        "type": "number"
-                                      },
-                                      {
-                                        "type": "null"
-                                      }
-                                    ]
-                                  },
-                                  "nature": {
-                                    "anyOf": [
-                                      {
-                                        "type": "string"
-                                      },
-                                      {
-                                        "type": "null"
-                                      }
-                                    ]
-                                  },
-                                  "startDate": {
-                                    "anyOf": [
-                                      {
-                                        "type": "string"
-                                      },
-                                      {
-                                        "type": "null"
-                                      }
-                                    ]
-                                  },
-                                  "startJd": {
-                                    "anyOf": [
-                                      {
-                                        "type": "number"
-                                      },
-                                      {
-                                        "type": "null"
-                                      }
-                                    ]
-                                  },
-                                  "targetPlanetId": {
-                                    "anyOf": [
-                                      {
-                                        "type": "number"
-                                      },
-                                      {
-                                        "type": "null"
-                                      }
-                                    ]
-                                  },
-                                  "transitPlanetId": {
-                                    "anyOf": [
-                                      {
-                                        "type": "number"
-                                      },
-                                      {
-                                        "type": "null"
-                                      }
-                                    ]
-                                  }
-                                },
-                                "type": "object"
-                              },
-                              {
-                                "type": "null"
-                              }
-                            ]
-                          },
-                          "type": "array"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "maxLanes": {
-                      "anyOf": [
-                        {
-                          "type": "number"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "planetId": {
-                      "anyOf": [
-                        {
-                          "type": "number"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    }
-                  },
-                  "type": "object"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "type": "array"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "timeRange": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "properties": {
-              "end": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "start": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      }
-    },
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": {},
+    "properties": {
+      "rows": {
+        "anyOf": [
+          {
+            "items": {
+              "anyOf": [
+                {
+                  "additionalProperties": {},
+                  "properties": {
+                    "bars": {
+                      "anyOf": [
+                        {
+                          "items": {
+                            "anyOf": [
+                              {
+                                "additionalProperties": {},
+                                "properties": {
+                                  "aspect": {
+                                    "anyOf": [
+                                      {
+                                        "additionalProperties": {},
+                                        "properties": {
+                                          "angle": {
+                                            "type": [
+                                              "number",
+                                              "null"
+                                            ]
+                                          },
+                                          "color": {
+                                            "type": [
+                                              "string",
+                                              "null"
+                                            ]
+                                          },
+                                          "i18nKey": {
+                                            "type": [
+                                              "string",
+                                              "null"
+                                            ]
+                                          },
+                                          "isMajor": {
+                                            "type": [
+                                              "boolean",
+                                              "null"
+                                            ]
+                                          },
+                                          "name": {
+                                            "type": [
+                                              "string",
+                                              "null"
+                                            ]
+                                          },
+                                          "orb": {
+                                            "type": [
+                                              "number",
+                                              "null"
+                                            ]
+                                          },
+                                          "symbol": {
+                                            "type": [
+                                              "string",
+                                              "null"
+                                            ]
+                                          }
+                                        },
+                                        "type": "object"
+                                      },
+                                      {
+                                        "type": "null"
+                                      }
+                                    ]
+                                  },
+                                  "endDate": {
+                                    "type": [
+                                      "string",
+                                      "null"
+                                    ]
+                                  },
+                                  "endJd": {
+                                    "type": [
+                                      "number",
+                                      "null"
+                                    ]
+                                  },
+                                  "exactDates": {
+                                    "anyOf": [
+                                      {
+                                        "items": {
+                                          "anyOf": [
+                                            {
+                                              "additionalProperties": {},
+                                              "properties": {
+                                                "date": {
+                                                  "type": [
+                                                    "string",
+                                                    "null"
+                                                  ]
+                                                },
+                                                "jd": {
+                                                  "type": [
+                                                    "number",
+                                                    "null"
+                                                  ]
+                                                }
+                                              },
+                                              "type": "object"
+                                            },
+                                            {
+                                              "type": "null"
+                                            }
+                                          ]
+                                        },
+                                        "type": "array"
+                                      },
+                                      {
+                                        "type": "null"
+                                      }
+                                    ]
+                                  },
+                                  "lane": {
+                                    "type": [
+                                      "number",
+                                      "null"
+                                    ]
+                                  },
+                                  "nature": {
+                                    "type": [
+                                      "string",
+                                      "null"
+                                    ]
+                                  },
+                                  "startDate": {
+                                    "type": [
+                                      "string",
+                                      "null"
+                                    ]
+                                  },
+                                  "startJd": {
+                                    "type": [
+                                      "number",
+                                      "null"
+                                    ]
+                                  },
+                                  "targetPlanetId": {
+                                    "type": [
+                                      "number",
+                                      "null"
+                                    ]
+                                  },
+                                  "transitPlanetId": {
+                                    "type": [
+                                      "number",
+                                      "null"
+                                    ]
+                                  }
+                                },
+                                "type": "object"
+                              },
+                              {
+                                "type": "null"
+                              }
+                            ]
+                          },
+                          "type": "array"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
+                    },
+                    "maxLanes": {
+                      "type": [
+                        "number",
+                        "null"
+                      ]
+                    },
+                    "planetId": {
+                      "type": [
+                        "number",
+                        "null"
+                      ]
+                    }
+                  },
+                  "type": "object"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "type": "array"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "timeRange": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "end": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "start": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      }
+    },
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / properties / rows / anyOf

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

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

First observedOct 5, 2026

TDQS

B3.1/5.0

Behavior3/5

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

Annotations already declare readOnly, idempotent, non-destructive, closed-world behavior, so the safety bar is covered. The description usefully adds cost (10 credits, Tier 1) and the output concept (bars with durations and marked dates), but says nothing about result size, pagination, or how filtering changes the response.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two tight, front-loaded sentences followed by a compact metadata block; every line carries information. Slightly lists toward boilerplate with the Group/Endpoint lines, but nothing is padded.

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

Completeness2/5

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

An output schema exists, so return values need no explanation, but with 10 parameters, only 20% schema coverage, and no description of the orb/step/planet-filter parameters, an agent cannot confidently build a correct call. The definition is under-specified for its complexity.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is only 20% across 10 parameters, so the description needs to compensate and does not. It restates only the two already-required fields (startDate, endDate); maxOrb, stepDays, planet1Ids, planet2Ids, aspectAngles, and visiblePlanetIds are left undocumented in both places.

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 gives a concrete verb and result shape: 'Transform aspect timelines into Gantt-style bars grouped by transit planet,' with each bar carrying orb duration and exact dates. This implicitly distinguishes it from astroway_aspects_aspect_timeline (raw data) and lands close to render tools, though no sibling is named explicitly.

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?

'Useful for visual transit calendars' implies a use case, but there is no explicit when-to-use versus when-not guidance and no named alternative such as astroway_aspects_aspect_timeline or astroway_render_timeline.

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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