AstroWay Vedic astrology

Navaratna reference table

astroway_vedic_gemstones_navaratna

Read-onlyIdempotent

The nine gems and their graha, with substitutes (upa-ratna), weekday, finger and its variants, metals, minimum weight range in ratti with gram and carat conversions, beeja mantra and japa count. Static lookup, no chart needed.

[Group: Vedic] [Endpoint: GET /v1/vedic/gemstones/navaratna] [Cost: 5 credits (Tier ½)]

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
`gems`	No
`count`	No
`sources`	No
`disclaimer`	No
`conversions`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed8 schema fields changedNov 7, 2026

changedOutput schema / properties / conversions / anyOf

Previous value: -[
-  {
-    "additionalProperties": {},
-    "properties": {
-      "rattiCarats": {
-        "anyOf": [
-          {
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "rattiGrams": {
-        "anyOf": [
-          {
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      }
-    },
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": {},
+    "properties": {
+      "rattiCarats": {
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "rattiGrams": {
+        "type": [
+          "number",
+          "null"
+        ]
+      }
+    },
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / properties / count / anyOf

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

addedOutput schema / properties / count / 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"
+]
```

changedOutput schema / properties / gems / anyOf

Previous value: -[
-  {
-    "items": {
-      "anyOf": [
-        {
-          "additionalProperties": {},
-          "properties": {
-            "gem": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "gemSanskrit": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "graha": {
-              "anyOf": [
-                {
-                  "type": "number"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "grahaName": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "grahaSanskrit": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "mineral": {
-              "anyOf": [
-                {
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "substitutes": {
-              "anyOf": [
-                {
-                  "items": {
-                    "anyOf": [
-                      {
-                        "type": "string"
-                      },
-                      {
-                        "type": "null"
-                      }
-                    ]
-                  },
-                  "type": "array"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "wearing": {
-              "anyOf": [
-                {
-                  "additionalProperties": {},
-                  "properties": {
-                    "day": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "finger": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "fingerVariants": {
-                      "anyOf": [
-                        {
-                          "items": {
-                            "anyOf": [
-                              {
-                                "type": "string"
-                              },
-                              {
-                                "type": "null"
-                              }
-                            ]
-                          },
-                          "type": "array"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "japaCount": {
-                      "anyOf": [
-                        {
-                          "type": "number"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "mantra": {
-                      "anyOf": [
-                        {
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "metals": {
-                      "anyOf": [
-                        {
-                          "items": {
-                            "anyOf": [
-                              {
-                                "type": "string"
-                              },
-                              {
-                                "type": "null"
-                              }
-                            ]
-                          },
-                          "type": "array"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "minWeight": {
-                      "anyOf": [
-                        {
-                          "additionalProperties": {},
-                          "properties": {
-                            "carats": {
-                              "anyOf": [
-                                {
-                                  "items": {
-                                    "anyOf": [
-                                      {
-                                        "type": "number"
-                                      },
-                                      {
-                                        "type": "null"
-                                      }
-                                    ]
-                                  },
-                                  "type": "array"
-                                },
-                                {
-                                  "type": "null"
-                                }
-                              ]
-                            },
-                            "grams": {
-                              "anyOf": [
-                                {
-                                  "items": {
-                                    "anyOf": [
-                                      {
-                                        "type": "number"
-                                      },
-                                      {
-                                        "type": "null"
-                                      }
-                                    ]
-                                  },
-                                  "type": "array"
-                                },
-                                {
-                                  "type": "null"
-                                }
-                              ]
-                            },
-                            "ratti": {
-                              "anyOf": [
-                                {
-                                  "items": {
-                                    "anyOf": [
-                                      {
-                                        "type": "number"
-                                      },
-                                      {
-                                        "type": "null"
-                                      }
-                                    ]
-                                  },
-                                  "type": "array"
-                                },
-                                {
-                                  "type": "null"
-                                }
-                              ]
-                            }
-                          },
-                          "type": "object"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    }
-                  },
-                  "type": "object"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            }
-          },
-          "type": "object"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "items": {
+      "anyOf": [
+        {
+          "additionalProperties": {},
+          "properties": {
+            "gem": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "gemSanskrit": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "graha": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "grahaName": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "grahaSanskrit": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "mineral": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "substitutes": {
+              "anyOf": [
+                {
+                  "items": {
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  },
+                  "type": "array"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "wearing": {
+              "anyOf": [
+                {
+                  "additionalProperties": {},
+                  "properties": {
+                    "day": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    },
+                    "finger": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    },
+                    "fingerVariants": {
+                      "anyOf": [
+                        {
+                          "items": {
+                            "type": [
+                              "string",
+                              "null"
+                            ]
+                          },
+                          "type": "array"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
+                    },
+                    "japaCount": {
+                      "type": [
+                        "number",
+                        "null"
+                      ]
+                    },
+                    "mantra": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    },
+                    "metals": {
+                      "anyOf": [
+                        {
+                          "items": {
+                            "type": [
+                              "string",
+                              "null"
+                            ]
+                          },
+                          "type": "array"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
+                    },
+                    "minWeight": {
+                      "anyOf": [
+                        {
+                          "additionalProperties": {},
+                          "properties": {
+                            "carats": {
+                              "anyOf": [
+                                {
+                                  "items": {
+                                    "type": [
+                                      "number",
+                                      "null"
+                                    ]
+                                  },
+                                  "type": "array"
+                                },
+                                {
+                                  "type": "null"
+                                }
+                              ]
+                            },
+                            "grams": {
+                              "anyOf": [
+                                {
+                                  "items": {
+                                    "type": [
+                                      "number",
+                                      "null"
+                                    ]
+                                  },
+                                  "type": "array"
+                                },
+                                {
+                                  "type": "null"
+                                }
+                              ]
+                            },
+                            "ratti": {
+                              "anyOf": [
+                                {
+                                  "items": {
+                                    "type": [
+                                      "number",
+                                      "null"
+                                    ]
+                                  },
+                                  "type": "array"
+                                },
+                                {
+                                  "type": "null"
+                                }
+                              ]
+                            }
+                          },
+                          "type": "object"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
+                    }
+                  },
+                  "type": "object"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            }
+          },
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "type": "array"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / properties / sources / anyOf

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

addedOutput schema / properties / sources / type
```
Added value: +[
+  "string",
+  "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 read-only, idempotent, non-destructive, closed-world behavior, so the safety profile is covered. The description adds genuinely new context beyond that: the payload is static reference data requiring no chart input (hence zero required parameters), and it discloses the cost of 5 credits. It stops short of describing pagination or how large the table is, but the output schema covers return shape.

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?

Two sentences, front-loaded with the resource and its contents, followed by the key behavioral fact ('static lookup, no chart needed'); the endpoint and credit-cost lines are compact metadata. The enumeration of fields is dense but each item tells the agent what data is available, so it earns its space.

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?

With an output schema present, annotations covering safety, and full schema coverage on the two optional parameters, the description only needs to convey what the static table contains and that no chart is required — which it does. Minor remaining gap is not naming the chart-based gemstone sibling to complete the routing picture.

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 description coverage is 100% and both parameters (fields, precision) are optional compact-mode controls already documented in the schema. The description adds nothing about them, which is acceptable but yields only the baseline 3 — an agent might not realize the same compact-mode knobs apply here as elsewhere.

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 description names a specific resource (the nine gems / Navaratna) and enumerates exactly what it returns: graha, upa-ratna substitutes, weekday, finger, metals, ratti/gram/carat weights, beeja mantra and japa count. The phrase 'Static lookup, no chart needed' implicitly separates it from the chart-driven sibling astroway_vedic_gemstones, though that sibling is 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 Guidelines3/5

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

'Static lookup, no chart needed' gives implied usage guidance: call this when you want reference data rather than a chart-derived recommendation. It does not explicitly say when to prefer this over astroway_vedic_gemstones, and gives no exclusions or prerequisites, leaving the routing inference to 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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