AstroWay Astrology API (full catalogue)

Birthday (chaldean)

astroway_numerology_chaldean_birthday

Read-onlyIdempotent

Calculate the Birthday number from the day-of-birth digit. Numerology: Chaldean system.

[Group: Numerology: Chaldean] [Endpoint: POST /v1/numerology/chaldean/birthday] [Required: name, date] [Cost: 10 credits (Tier 1)]

Input Schema

Name	Required	Description
`date`	Yes
`name`	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.
`precision`	No	Compact mode: round fractional numbers to this many decimals. Longitudes carry 14 by default; 2 is finer than any chart is drawn.

Output Schema

Name	Required	Description	Default
`date`	No
`name`	No
`system`	No
`birthday`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed7 schema fields changedNov 7, 2026

changedOutput schema / properties / birthday / anyOf

Previous value: -[
-  {
-    "additionalProperties": {},
-    "properties": {
-      "isMaster": {
-        "anyOf": [
-          {
-            "type": "boolean"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "meaning": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "properties": {
-              "archetype": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "number": {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "shortRead": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "strengths": {
-                "anyOf": [
-                  {
-                    "items": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "type": "array"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "raw": {
-        "anyOf": [
-          {
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "reduced": {
-        "anyOf": [
-          {
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "steps": {
-        "anyOf": [
-          {
-            "items": {
-              "anyOf": [
-                {
-                  "type": "number"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "type": "array"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      }
-    },
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": {},
+    "properties": {
+      "isMaster": {
+        "type": [
+          "boolean",
+          "null"
+        ]
+      },
+      "meaning": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "archetype": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "number": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "shortRead": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "strengths": {
+                "anyOf": [
+                  {
+                    "items": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    },
+                    "type": "array"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "raw": {
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "reduced": {
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "steps": {
+        "anyOf": [
+          {
+            "items": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "type": "array"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      }
+    },
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / properties / date / anyOf

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

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

removedOutput schema / properties / name / anyOf

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

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

removedOutput schema / properties / system / anyOf

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

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

First observedOct 5, 2026

TDQS

B3/5.0

Behavior3/5

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

Annotations already declare readOnly, idempotent, non-destructive and closed-world behavior, so the safety profile is covered. The description adds genuinely useful context the annotations lack: the endpoint and the cost of 10 credits (Tier 1). It says nothing about what the response contains or any failure modes, but with annotations in place a 3 is appropriate.

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 purpose is front-loaded in one sentence, followed by compact bracketed metadata that is easy to scan. The '[Group: Numerology: Chaldean]' line partially duplicates the first sentence but the waste is small.

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?

An output schema exists, so return values need no explanation, and cost/endpoint are disclosed. What is missing is anything about the date's expected semantics (timezone, whether the day is extracted from the ISO date) and any note on which of the four siblings this is the right pick for, which matters given dozens of near-identical birthday tools.

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 50%: 'fields' and 'precision' are documented in-schema, while 'name' and 'date' carry only type/pattern constraints. The description adds nothing beyond confirming name and date are required (already in the schema) and never explains the date format or how the day-of-birth digit is derived from 'date', so it does not compensate for the coverage gap.

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 first sentence names a specific verb ('Calculate'), a specific output ('the Birthday number') and the system ('Chaldean'), and 'from the day-of-birth digit' clarifies what input drives the result. The Chaldean label is what separates it from the kabbalistic, pythagorean and vedic birthday siblings, though those siblings are never 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 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 choose this over the many other birthday-number variants, nor any prerequisite or exclusion guidance. The [Required: name, date] line restates the schema rather than advising the agent.

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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