AstroWay Astrology API (full catalogue)

Expression / Destiny (pythagorean)

astroway_numerology_pythagorean_expression

Read-onlyIdempotent

Calculate the Expression (Destiny) number from full birth name letters (all letters, reduced). Numerology: Pythagorean system.

[Group: Numerology: Pythagorean] [Endpoint: POST /v1/numerology/pythagorean/expression] [Required: name, date] [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": {
      "name": "<name>",
      "date": "<date>"
    },
    "name": "astroway_numerology_pythagorean_expression"
  }
}

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
`expression`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed7 schema fields changedNov 7, 2026

removedOutput schema / properties / date / anyOf

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

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

changedOutput schema / properties / expression / 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 / 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

B3.4/5.0

Behavior3/5

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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), so the bar is lower. The description adds genuinely useful operational facts the annotations cannot: the POST endpoint and a cost of 10 credits (Tier 1). It says nothing about reduction semantics (master numbers, exceptions) or rate limits, so it is additive but not rich.

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 core sentence is front-loaded and precise, and the bracketed metadata lines are terse and scannable. Minor redundancy in restating the system name in both the sentence and the group line, but nothing is wasted at length.

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 not be described, and the cost/endpoint metadata is a nice addition. The gap is the unexplained required 'date' parameter and the absent note on how the reduction handles master numbers, which matters for a numerology calculation tool.

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

Parameters3/5

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

Schema coverage is 50%: 'fields' and 'precision' are documented in-schema, while 'name' and 'date' are bare. The description partially compensates by clarifying that name means the full birth name letters, but it never explains why 'date' is required for an expression-number calculation, leaving a required parameter unexplained 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?

States a specific verb and resource: 'Calculate the Expression (Destiny) number', and pins the system ('Numerology: Pythagorean system') plus the input source ('full birth name letters, all letters, reduced'). That system label is the main discriminator against the many chaldean_/kabbalistic_/vedic_expression siblings, but the description never names an alternative tool, so routing is inferred rather than stated.

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?

Usage is only implied: 'from full birth name letters' hints that the name parameter must be the complete birth name rather than a nickname, which is real but unstated guidance. There is no explicit when-to-use, when-not, or pointer to the Chaldean/Kabbalistic/Vedic expression variants for comparison.

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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