AstroWay Astrology API (full catalogue)

RWS: Single Card Draw

astroway_tarot_rider_waite_draw_single

Read-onlyIdempotent

Draw 1 card from the RWS deck. Optional seed for deterministic shuffle.

[Group: Tarot: Rider-Waite-Smith] [Endpoint: POST /v1/tarot/rider-waite/draw/single] [Cost: 10 credits (Tier 1)]

Input Schema

Name	Required	Description
`art`	No	Card art set, e.g. rws-1909, rws-restored, rws-vector. GET /v1/tarot/decks lists the sets per deck.
`seed`	No
`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.
`question`	No
`precision`	No	Compact mode: round fractional numbers to this many decimals. Longitudes carry 14 by default; 2 is finer than any chart is drawn.
`allowReversed`	No

Output Schema

Name	Required	Description	Default
`seed`	No
`drawn`	No
`spread`	No
`localized`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed5 schema fields changedNov 7, 2026

changedOutput schema / properties / drawn / anyOf

Previous value: -[
-  {
-    "items": {
-      "anyOf": [
-        {
-          "additionalProperties": {},
-          "properties": {
-            "card": {
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-                  "properties": {
-                    "astrology": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "category": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "element": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "name": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "number": {
-                      "anyOf": [
-                        {
-                          "type": "number"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "numerology": {
-                      "anyOf": [
-                        {
-                          "type": "number"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "rank": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "reversed": {
-                      "anyOf": [
-                        {
-                          "additionalProperties": {},
-                          "properties": {
-                            "keywords": {
-                              "anyOf": [
-                                {
-                                  "items": {
-                                    "anyOf": [
-                                      {
-                                        "type": "string"
-                                      },
-                                      {
-                                        "type": "null"
-                                      }
-                                    ]
-                                  },
-                                  "type": "array"
-                                },
-                                {
-                                  "type": "null"
-                                }
-                              ]
-                            },
-                            "meaning": {
-                              "anyOf": [
-                                {
-                                  "type": "string"
-                                },
-                                {
-                                  "type": "null"
-                                }
-                              ]
-                            }
-                          },
-                          "type": "object"
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-                        {
-                          "type": "null"
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-                      ]
-                    },
-                    "slug": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "suit": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "upright": {
-                      "anyOf": [
-                        {
-                          "additionalProperties": {},
-                          "properties": {
-                            "keywords": {
-                              "anyOf": [
-                                {
-                                  "items": {
-                                    "anyOf": [
-                                      {
-                                        "type": "string"
-                                      },
-                                      {
-                                        "type": "null"
-                                      }
-                                    ]
-                                  },
-                                  "type": "array"
-                                },
-                                {
-                                  "type": "null"
-                                }
-                              ]
-                            },
-                            "meaning": {
-                              "anyOf": [
-                                {
-                                  "type": "string"
-                                },
-                                {
-                                  "type": "null"
-                                }
-                              ]
-                            }
-                          },
-                          "type": "object"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "yes": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    }
-                  },
-                  "type": "object"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "position": {
-              "anyOf": [
-                {
-                  "additionalProperties": {},
-                  "properties": {
-                    "index": {
-                      "anyOf": [
-                        {
-                          "type": "number"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "meaning": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "name": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    }
-                  },
-                  "type": "object"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "reversed": {
-              "anyOf": [
-                {
-                  "type": "boolean"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            }
-          },
-          "type": "object"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "items": {
+      "anyOf": [
+        {
+          "additionalProperties": {},
+          "properties": {
+            "card": {
+              "anyOf": [
+                {
+                  "additionalProperties": {},
+                  "properties": {
+                    "astrology": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    },
+                    "category": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    },
+                    "element": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    },
+                    "name": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    },
+                    "number": {
+                      "type": [
+                        "number",
+                        "null"
+                      ]
+                    },
+                    "numerology": {
+                      "type": [
+                        "number",
+                        "null"
+                      ]
+                    },
+                    "rank": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    },
+                    "reversed": {
+                      "anyOf": [
+                        {
+                          "additionalProperties": {},
+                          "properties": {
+                            "keywords": {
+                              "anyOf": [
+                                {
+                                  "items": {
+                                    "type": [
+                                      "string",
+                                      "null"
+                                    ]
+                                  },
+                                  "type": "array"
+                                },
+                                {
+                                  "type": "null"
+                                }
+                              ]
+                            },
+                            "meaning": {
+                              "type": [
+                                "string",
+                                "null"
+                              ]
+                            }
+                          },
+                          "type": "object"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
+                    },
+                    "slug": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    },
+                    "suit": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    },
+                    "upright": {
+                      "anyOf": [
+                        {
+                          "additionalProperties": {},
+                          "properties": {
+                            "keywords": {
+                              "anyOf": [
+                                {
+                                  "items": {
+                                    "type": [
+                                      "string",
+                                      "null"
+                                    ]
+                                  },
+                                  "type": "array"
+                                },
+                                {
+                                  "type": "null"
+                                }
+                              ]
+                            },
+                            "meaning": {
+                              "type": [
+                                "string",
+                                "null"
+                              ]
+                            }
+                          },
+                          "type": "object"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
+                    },
+                    "yes": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    }
+                  },
+                  "type": "object"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "position": {
+              "anyOf": [
+                {
+                  "additionalProperties": {},
+                  "properties": {
+                    "index": {
+                      "type": [
+                        "number",
+                        "null"
+                      ]
+                    },
+                    "meaning": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    },
+                    "name": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    }
+                  },
+                  "type": "object"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "reversed": {
+              "type": [
+                "boolean",
+                "null"
+              ]
+            }
+          },
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "type": "array"
+  },
+  {
+    "type": "null"
+  }
+]

changedOutput schema / properties / localized / anyOf

Previous value: -[
-  {
-    "additionalProperties": {},
-    "properties": {
-      "cards": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "properties": {
-              "8-of-pentacles": {
-                "anyOf": [
-                  {
-                    "additionalProperties": {},
-                    "properties": {
-                      "name": {
-                        "anyOf": [
-                          {
-                            "type": "string"
-                          },
-                          {
-                            "type": "null"
-                          }
-                        ]
-                      },
-                      "nameLocalized": {
-                        "anyOf": [
-                          {
-                            "type": "boolean"
-                          },
-                          {
-                            "type": "null"
-                          }
-                        ]
-                      },
-                      "reversed": {
-                        "anyOf": [
-                          {
-                            "additionalProperties": {},
-                            "properties": {
-                              "keywords": {
-                                "anyOf": [
-                                  {
-                                    "items": {
-                                      "anyOf": [
-                                        {
-                                          "type": "string"
-                                        },
-                                        {
-                                          "type": "null"
-                                        }
-                                      ]
-                                    },
-                                    "type": "array"
-                                  },
-                                  {
-                                    "type": "null"
-                                  }
-                                ]
-                              },
-                              "meaning": {
-                                "anyOf": [
-                                  {
-                                    "type": "string"
-                                  },
-                                  {
-                                    "type": "null"
-                                  }
-                                ]
-                              }
-                            },
-                            "type": "object"
-                          },
-                          {
-                            "type": "null"
-                          }
-                        ]
-                      },
-                      "suit": {
-                        "anyOf": [
-                          {
-                            "type": "string"
-                          },
-                          {
-                            "type": "null"
-                          }
-                        ]
-                      },
-                      "textLocalized": {
-                        "anyOf": [
-                          {
-                            "type": "boolean"
-                          },
-                          {
-                            "type": "null"
-                          }
-                        ]
-                      },
-                      "upright": {
-                        "anyOf": [
-                          {
-                            "additionalProperties": {},
-                            "properties": {
-                              "keywords": {
-                                "anyOf": [
-                                  {
-                                    "items": {
-                                      "anyOf": [
-                                        {
-                                          "type": "string"
-                                        },
-                                        {
-                                          "type": "null"
-                                        }
-                                      ]
-                                    },
-                                    "type": "array"
-                                  },
-                                  {
-                                    "type": "null"
-                                  }
-                                ]
-                              },
-                              "meaning": {
-                                "anyOf": [
-                                  {
-                                    "type": "string"
-                                  },
-                                  {
-                                    "type": "null"
-                                  }
-                                ]
-                              }
-                            },
-                            "type": "object"
-                          },
-                          {
-                            "type": "null"
-                          }
-                        ]
-                      }
-                    },
-                    "type": "object"
-                  },
-                  {
-                    "type": "null"
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-                ]
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-            },
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-          },
-          {
-            "type": "null"
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-        ]
-      },
-      "positions": {
-        "anyOf": [
-          {
-            "items": {
-              "anyOf": [
-                {
-                  "additionalProperties": {},
-                  "properties": {
-                    "index": {
-                      "anyOf": [
-                        {
-                          "type": "number"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "meaning": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "name": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    }
-                  },
-                  "type": "object"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "type": "array"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "spread": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "properties": {
-              "name": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "textLocalized": {
-        "anyOf": [
-          {
-            "type": "boolean"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      }
-    },
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": {},
+    "properties": {
+      "cards": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "8-of-pentacles": {
+                "anyOf": [
+                  {
+                    "additionalProperties": {},
+                    "properties": {
+                      "name": {
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      },
+                      "nameLocalized": {
+                        "type": [
+                          "boolean",
+                          "null"
+                        ]
+                      },
+                      "reversed": {
+                        "anyOf": [
+                          {
+                            "additionalProperties": {},
+                            "properties": {
+                              "keywords": {
+                                "anyOf": [
+                                  {
+                                    "items": {
+                                      "type": [
+                                        "string",
+                                        "null"
+                                      ]
+                                    },
+                                    "type": "array"
+                                  },
+                                  {
+                                    "type": "null"
+                                  }
+                                ]
+                              },
+                              "meaning": {
+                                "type": [
+                                  "string",
+                                  "null"
+                                ]
+                              }
+                            },
+                            "type": "object"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      },
+                      "suit": {
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      },
+                      "textLocalized": {
+                        "type": [
+                          "boolean",
+                          "null"
+                        ]
+                      },
+                      "upright": {
+                        "anyOf": [
+                          {
+                            "additionalProperties": {},
+                            "properties": {
+                              "keywords": {
+                                "anyOf": [
+                                  {
+                                    "items": {
+                                      "type": [
+                                        "string",
+                                        "null"
+                                      ]
+                                    },
+                                    "type": "array"
+                                  },
+                                  {
+                                    "type": "null"
+                                  }
+                                ]
+                              },
+                              "meaning": {
+                                "type": [
+                                  "string",
+                                  "null"
+                                ]
+                              }
+                            },
+                            "type": "object"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      }
+                    },
+                    "type": "object"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "positions": {
+        "anyOf": [
+          {
+            "items": {
+              "anyOf": [
+                {
+                  "additionalProperties": {},
+                  "properties": {
+                    "index": {
+                      "type": [
+                        "number",
+                        "null"
+                      ]
+                    },
+                    "meaning": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    },
+                    "name": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    }
+                  },
+                  "type": "object"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "type": "array"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "spread": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "name": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "textLocalized": {
+        "type": [
+          "boolean",
+          "null"
+        ]
+      }
+    },
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / properties / seed / anyOf

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

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

changedOutput schema / properties / spread / anyOf

Previous value: -[
-  {
-    "additionalProperties": {},
-    "properties": {
-      "cardCount": {
-        "anyOf": [
-          {
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "name": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "slug": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      }
-    },
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": {},
+    "properties": {
+      "cardCount": {
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "name": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "slug": {
+        "type": [
+          "string",
+          "null"
+        ]
+      }
+    },
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

Changed1 schema field changedOct 5, 2026

addedInput schema / properties / art

Added value: +{
+  "description": "Card art set, e.g. rws-1909, rws-restored, rws-vector. GET /v1/tarot/decks lists the sets per deck.",
+  "maxLength": 40,
+  "type": "string"
+}

First observedOct 5, 2026

TDQS

B3.2/5.0

Behavior3/5

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

Annotations already establish readOnly, idempotent, non-destructive behavior, and the description adds genuinely useful context by explaining the seed yields a deterministic shuffle and noting the 10-credit cost and POST endpoint. It does not explain what the response contains (mitigated by an output schema) or how allowReversed affects the result.

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 efficient, and the metadata block is compact and scannable. A small amount of space is spent on group/endpoint/cost tags that carry little selection value for the agent, but nothing is verbose.

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?

Return values are covered by the output schema, so the description need not explain them. However, for a 6-parameter tool with two entirely undocumented parameters and no guidance on choosing between the many tarot draw variants, the description leaves real gaps.

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?

With 50% schema coverage, the description adds meaning for one undocumented parameter by framing seed as controlling deterministic shuffling. The other undocumented parameters, question and allowReversed, get no explanation in either the schema or the description, so the compensation is partial.

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?

"Draw 1 card from the RWS deck" gives a specific verb, resource, and count, which implicitly separates it from siblings like draw_three_card or draw_celtic_cross. It stops short of naming those alternatives explicitly, so the differentiation is inferable 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 Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description never says when to pick a single draw over the three-card, daily, clarify, or interpret tools in the same RWS family. There is no when-to-use or when-not-to-use guidance at all, leaving routing entirely to the agent's inference from the tool name.

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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