AstroWay Astrology API (full catalogue)

Yesterday's Sky

astroway_evolutionary_yesterday_sky

Read-onlyIdempotent

Forrest 2008 past-life method.

[Group: Evolutionary Astrology] [Endpoint: POST /v1/evolutionary/yesterday-sky] [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_evolutionary_yesterday_sky"
  }
}

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
`narrative`	No
`disclaimer`	No
`pastLifeImprint`	No
`luminaryContacts`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed12 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 / 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 / luminaryContacts / anyOf

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

removedOutput schema / properties / narrative / anyOf

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

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

changedOutput schema / properties / pastLifeImprint / anyOf

Previous value: -[
-  {
-    "additionalProperties": {},
-    "properties": {
-      "chironAsWound": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "properties": {
-              "house": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "sign": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "theme": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "saturnAsKarmicTeacher": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "properties": {
-              "house": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "sign": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "theme": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "southNode": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "properties": {
-              "house": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "ruler": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "rulerSign": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "sign": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      }
-    },
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": {},
+    "properties": {
+      "chironAsWound": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "house": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "sign": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "theme": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "saturnAsKarmicTeacher": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "house": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "sign": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "theme": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "southNode": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "house": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "ruler": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "rulerSign": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "sign": {
+                "type": [
+                  "string",
+                  "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

C2.6/5.0

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 lack: the HTTP endpoint and a per-call cost of 10 credits (Tier 1), which matters for a metered API. It says nothing about response size, latency, or what the method computes, so it stays at the minimum-plus level.

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?

The bracketed tag format is scannable and free of filler, and the required-input and cost lines are front-loaded. But the substance is so thin that brevity reads as under-specification rather than economy; the one descriptive sentence carries almost no operational information.

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 not be explained, but for a 15-parameter metered tool the definition is far from complete: no explanation of the sidereal/tropical and house-system choices, no usage routing among evolutionary siblings, and no note on how the required date/time/coordinates interact with timezone handling. The burden falls almost entirely on the schema, which itself is only a third documented.

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?

The description only echoes the four required parameters (date, time, latitude, longitude), which the schema already marks as required, so it adds essentially no meaning. With 15 parameters and only 33% schema description coverage, undocumented inputs such as zodiacType, houseSystem, cosmogram, ayanamsaId, name, and city are left unexplained in both places. The description should have compensated for that gap and does not.

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 identifies a named technique ("Forrest 2008 past-life method"), which is more specific than the title alone and loosely signals a karmic/evolutionary astrology computation. However, it never states a verb or the resource produced, so an agent cannot tell whether this returns a chart, an interpretation, or a derived set of points. It is vague on what the tool actually does beyond invoking a method.

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 and no differentiation from the many evolutionary siblings (astroway_evolutionary_nodal_axis_detail, astroway_evolutionary_pluto_natal_condition, astroway_evolutionary_skipped_steps, astroway_evolutionary_soul_types). The metadata block states required inputs and cost but not the decision criteria for selecting this tool over those.

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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