AstroWay Astrology API (full catalogue)

Hyleg Longevity

astroway_hellenistic_hand_longevity_hyleg

Read-onlyIdempotent

Tetrabiblos III.10 hyleg + alcocoden.

[Group: Hellenistic: Hand tradition] [Endpoint: POST /v1/hellenistic/hand/longevity-hyleg] [Required: date, time, latitude, longitude] [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": {
      "date": "<date>",
      "time": "<time>",
      "latitude": "<latitude>",
      "longitude": "<longitude>"
    },
    "name": "astroway_hellenistic_hand_longevity_hyleg"
  }
}

Input Schema

Name	Required	Description	Default
`city`	No
`date`	Yes
`name`	No
`time`	Yes
`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.
`ayanamsa`	No	Sidereal school by name. Lahiri when omitted. Equivalent to ayanamsaId; send either.
`latitude`	Yes
`timezone`	No	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.
`cosmogram`	No
`longitude`	Yes
`precision`	No	Compact mode: round fractional numbers to this many decimals. Longitudes carry 14 by default; 2 is finer than any chart is drawn.
`ayanamsaId`	No
`zodiacType`	No
`houseSystem`	No		P
`timezoneOffset`	No	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.

Output Schema

Name	Required	Description	Default
`hyleg`	No
`notes`	No
`source`	No
`caveats`	No
`doctrine`	No
`alcocoden`	No
`hylegSign`	No
`disclaimer`	No
`alcocodenSign`	No
`hylegLongitude`	No
`lifespanEstimate`	No
`planetYearsTable`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed21 schema fields changedNov 7, 2026

removedInput schema / properties / ayanamsaId / anyOf

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

addedInput schema / properties / ayanamsaId / type
```
Added value: +[
+  "number",
+  "null"
+]
```

removedOutput schema / properties / alcocoden / anyOf

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

addedOutput schema / properties / alcocoden / type
```
Added value: +[
+  "string",
+  "null"
+]
```

removedOutput schema / properties / alcocodenSign / anyOf

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

addedOutput schema / properties / alcocodenSign / type
```
Added value: +[
+  "string",
+  "null"
+]
```

changedOutput schema / properties / caveats / anyOf

Previous value: -[
-  {
-    "items": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "items": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "type": "array"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / properties / disclaimer / anyOf

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

addedOutput schema / properties / disclaimer / type
```
Added value: +[
+  "string",
+  "null"
+]
```

removedOutput schema / properties / doctrine / anyOf

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

addedOutput schema / properties / doctrine / type
```
Added value: +[
+  "string",
+  "null"
+]
```

removedOutput schema / properties / hyleg / anyOf

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

addedOutput schema / properties / hyleg / type
```
Added value: +[
+  "string",
+  "null"
+]
```

removedOutput schema / properties / hylegLongitude / anyOf

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

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

removedOutput schema / properties / hylegSign / anyOf

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

addedOutput schema / properties / hylegSign / type
```
Added value: +[
+  "string",
+  "null"
+]
```

changedOutput schema / properties / lifespanEstimate / anyOf

Previous value: -[
-  {
-    "additionalProperties": {},
-    "properties": {
-      "estimateYears": {
-        "anyOf": [
-          {
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "greater": {
-        "anyOf": [
-          {
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "mean": {
-        "anyOf": [
-          {
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "minor": {
-        "anyOf": [
-          {
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "useTier": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      }
-    },
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": {},
+    "properties": {
+      "estimateYears": {
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "greater": {
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "mean": {
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "minor": {
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "useTier": {
+        "type": [
+          "string",
+          "null"
+        ]
+      }
+    },
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

changedOutput schema / properties / planetYearsTable / anyOf

Previous value: -[
-  {
-    "additionalProperties": {},
-    "properties": {
-      "Jupiter": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "properties": {
-              "greater": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "mean": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "minor": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "Mars": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "properties": {
-              "greater": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "mean": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "minor": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "Mercury": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "properties": {
-              "greater": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "mean": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "minor": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "Moon": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "properties": {
-              "greater": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "mean": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "minor": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "Saturn": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "properties": {
-              "greater": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "mean": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "minor": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "Sun": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "properties": {
-              "greater": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "mean": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "minor": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "Venus": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "properties": {
-              "greater": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "mean": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "minor": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      }
-    },
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": {},
+    "properties": {
+      "Jupiter": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "greater": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "mean": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "minor": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "Mars": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "greater": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "mean": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "minor": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "Mercury": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "greater": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "mean": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "minor": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "Moon": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "greater": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "mean": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "minor": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "Saturn": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "greater": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "mean": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "minor": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "Sun": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "greater": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "mean": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "minor": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "Venus": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "greater": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "mean": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "minor": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      }
+    },
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / properties / source / anyOf

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

addedOutput schema / properties / source / type
```
Added value: +[
+  "string",
+  "null"
+]
```

First observedOct 5, 2026

TDQS

C2.7/5.0

Behavior3/5

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

Annotations already establish readOnly, idempotent, closed-world, non-destructive behavior, so the bar is lower. The description adds genuinely useful operational context — the POST endpoint and a cost of 10 credits (Tier 1) — but says nothing about what the computation yields or how the hyleg/alcocoden determination is presented.

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?

Four short bracketed lines, front-loaded with the doctrinal reference and ending with cost, so an agent can scan it instantly. The tag format is efficient, though the group label and endpoint line carry little decision value.

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?

This is a 15-parameter tool with enums, geolocation, and timezone semantics, yet the description explains none of it and gives no sense of the outcome. An output schema exists so return values need not be explained, but the definition is still too thin for a tool of this complexity and cost.

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 33% across 15 parameters, so the description needs to compensate. Instead it only repeats the four required fields (date, time, latitude, longitude), which the schema already marks as required, and adds nothing about timezone vs timezoneOffset, ayanamsa, houseSystem, fields, or precision.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose3/5

Does the description clearly state what the tool does and how it differs from similar tools?

It names a specific technique with a citation ("Tetrabiblos III.10 hyleg + alcocoden"), so the subject matter is identifiable for a specialist, but it never states in plain terms what the tool computes or returns. It also does not distinguish itself from the nearby sibling astroway_dignities_hyleg, which an agent could easily confuse it with.

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, no exclusion, and no named alternative among the many Hellenistic hand/brennan/greenbaum siblings. The "[Required: ...]" tag restates schema requirements rather than describing when the technique applies.

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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