AstroWay Astrology API (full catalogue)

Crystals: Full Directory

astroway_esoteric_crystals

Read-onlyIdempotent

Reference list of crystals with chakra, zodiac, planet, element, hardness, and purpose tags. Returns chakra and purpose taxonomies for filtering.

[Group: Esoteric] [Endpoint: GET /v1/esoteric/crystals] [Cost: 5 credits (Tier ½)]

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "astroway_esoteric_crystals"
  }
}

Input Schema

Name	Required	Description	Default
`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
`count`	No
`items`	No
`chakras`	No
`purposes`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed5 schema fields changedNov 7, 2026

changedOutput schema / properties / chakras / 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 / count / anyOf

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

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

changedOutput schema / properties / items / anyOf

Previous value: -[
-  {
-    "items": {
-      "anyOf": [
-        {
-          "additionalProperties": {},
-          "properties": {
-            "chakra": {
-              "anyOf": [
-                {
-                  "items": {
-                    "anyOf": [
-                      {
-                        "type": "string"
-                      },
-                      {
-                        "type": "null"
-                      }
-                    ]
-                  },
-                  "type": "array"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "color": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "description": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "element": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "hardness": {
-              "anyOf": [
-                {
-                  "type": "number"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "name": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "planet": {
-              "anyOf": [
-                {
-                  "items": {
-                    "anyOf": [
-                      {
-                        "type": "string"
-                      },
-                      {
-                        "type": "null"
-                      }
-                    ]
-                  },
-                  "type": "array"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "purposes": {
-              "anyOf": [
-                {
-                  "items": {
-                    "anyOf": [
-                      {
-                        "type": "string"
-                      },
-                      {
-                        "type": "null"
-                      }
-                    ]
-                  },
-                  "type": "array"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "zodiacSigns": {
-              "anyOf": [
-                {
-                  "items": {
-                    "anyOf": [
-                      {
-                        "type": "string"
-                      },
-                      {
-                        "type": "null"
-                      }
-                    ]
-                  },
-                  "type": "array"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            }
-          },
-          "type": "object"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "items": {
+      "anyOf": [
+        {
+          "additionalProperties": {},
+          "properties": {
+            "chakra": {
+              "anyOf": [
+                {
+                  "items": {
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  },
+                  "type": "array"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "color": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "description": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "element": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "hardness": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "name": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "planet": {
+              "anyOf": [
+                {
+                  "items": {
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  },
+                  "type": "array"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "purposes": {
+              "anyOf": [
+                {
+                  "items": {
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  },
+                  "type": "array"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "zodiacSigns": {
+              "anyOf": [
+                {
+                  "items": {
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  },
+                  "type": "array"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            }
+          },
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "type": "array"
+  },
+  {
+    "type": "null"
+  }
+]

changedOutput schema / properties / purposes / anyOf

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

First observedOct 5, 2026

TDQS

A3.7/5.0

Behavior4/5

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 non-redundant behavior: the cost of 5 credits (Tier ½), the GET endpoint, and the fact that the response carries taxonomy structures usable as filter inputs — cost disclosure in particular is context annotations cannot express. It stops short of describing list size or pagination behavior.

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 dense — resource plus tag dimensions plus the taxonomy return in two clauses. The bracketed [Group]/[Endpoint]/[Cost] metadata block is structured rather than prose, and the cost line earns its place; the endpoint line is marginal but harmless.

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?

For a zero-required-parameter read tool with an output schema, this covers purpose, tag dimensions, return shape at a high level, and cost. An agent can call it correctly from this description. Minor gaps: no hint about response size or whether the full directory is paginated.

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?

Both parameters (fields, precision) are fully documented in the schema at 100% coverage, so the schema carries parameter semantics and a baseline 3 applies. The description mentions no parameters at all, so it neither compensates nor needs to; notably the parameters are generic compact-mode controls, not crystal-specific filters.

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?

"Reference list of crystals" with an enumerated tag vocabulary (chakra, zodiac, planet, element, hardness, purpose) states a specific verb+resource and scope, and the title reinforces the full-directory nature. However, it never names the sibling variants (by_chakra, by_purpose, by_zodiac, recommend), so an agent must infer the distinction between "full list" and "filtered list" from names alone.

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?

"Returns chakra and purpose taxonomies for filtering" implies a discovery use case — fetch this first to learn valid filter values, then call the by_* siblings — but the connection is never made explicit. There is no statement of when to prefer this over astroway_esoteric_crystals_by_zodiac_sign or astroway_esoteric_crystals_recommend, and no exclusions.

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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