AstroWay Astrology API (full catalogue)

Antiscia (Hellenistic)

astroway_hellenistic_greenbaum_antiscia_hellenistic

Read-onlyIdempotent

Solstitial antiscia per Hellenistic conventions.

[Group: Hellenistic: Greenbaum tradition] [Endpoint: POST /v1/hellenistic/greenbaum/antiscia-hellenistic] [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_greenbaum_antiscia_hellenistic"
  }
}

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
`source`	No
`doctrine`	No
`perPlanet`	No
`disclaimer`	No
`antiscionContacts`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed10 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"
+]
```

changedOutput schema / properties / antiscionContacts / anyOf

Previous value: -[
-  {
-    "items": {
-      "anyOf": [
-        {
-          "additionalProperties": {},
-          "properties": {
-            "orb": {
-              "anyOf": [
-                {
-                  "type": "number"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "planet1": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "planet2": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "type": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            }
-          },
-          "type": "object"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "items": {
+      "anyOf": [
+        {
+          "additionalProperties": {},
+          "properties": {
+            "orb": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "planet1": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "planet2": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "type": {
+              "type": [
+                "string",
+                "null"
+              ]
+            }
+          },
+          "type": "object"
+        },
+        {
+          "type": "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"
+]
```

changedOutput schema / properties / perPlanet / anyOf

Previous value: -[
-  {
-    "items": {
-      "anyOf": [
-        {
-          "additionalProperties": {},
-          "properties": {
-            "antiscion": {
-              "anyOf": [
-                {
-                  "type": "number"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "antiscionSign": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "longitude": {
-              "anyOf": [
-                {
-                  "type": "number"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "planet": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "sign": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            }
-          },
-          "type": "object"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "items": {
+      "anyOf": [
+        {
+          "additionalProperties": {},
+          "properties": {
+            "antiscion": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "antiscionSign": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "longitude": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "planet": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "sign": {
+              "type": [
+                "string",
+                "null"
+              ]
+            }
+          },
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "type": "array"
+  },
+  {
+    "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

C2.8/5.0

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 safety needs no restating. The description adds the useful operational facts of cost (10 credits, Tier 1) and the POST endpoint, but says nothing about what the computation returns or any tradition-specific caveats beyond the word 'Hellenistic'.

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

Conciseness3/5

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

It is short and front-loaded, with the purpose sentence first, which is good. But three of the four bracketed metadata lines (group, endpoint) are boilerplate that an agent already gets from the name and transport, so they do not fully earn their space.

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

Completeness4/5

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

An output schema exists, so return-value explanation is not required, and annotations cover safety. What remains missing is guidance on the traditions named in the sibling cluster: the description does not say what, if anything, differs from the helg or Brennan antiscia variants or how the optional sidereal and house-system parameters affect a Hellenistic chart.

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 coverage is only 33% across 15 parameters, so the description should compensate, but it only re-lists the four required fields the schema already marks required. Undocumented parameters like zod? no—like cosmogram, zodiacType, and the many houseSystem enum codes get no explanation here, and no hint about how ayanamsa interacts with zodiacType.

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?

The description names the resource ('solstitial antiscia') and an interpretive tradition ('Hellenistic conventions'), but no verb says what the tool does with it (compute a chart? list antiscia aspects?). It also does not distinguish itself from close siblings such as astroway_helg_antiscia_hellenistic, astroway_aspects_antiscia, or the paired astroway_hellenistic_greenbaum_contra_antiscia.

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 statement of when to use this over the near-identical antiscia tools in the sibling list, nor when not to. The metadata lines give no situational context beyond endpoint and cost.

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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