Vedic Astrology and Kundli MCP Server by RoxyAPI

Get Navamsa chart (D9) - Marriage Compatibility Calculator

post_vedic_astrology_navamsa

Read-only

Calculate Navamsa (D9 divisional chart) for marriage compatibility analysis, spouse prediction, and spiritual life assessment. Navamsa calculator API reveals planetary strength in married life. Each planetary position is divided into 9 parts for accurate marriage astrology. Detects Vargottama planets (exalted status). Essential for matrimonial matching, relationship prediction, and marital harmony analysis in Vedic astrology.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`date`	Yes	Birth date in YYYY-MM-DD format. Date determines planetary positions and nakshatra calculations for Vedic kundli (janam patri). Accurate birth date is essential for dashas, yoga calculations, and divisional charts (vargas).
`lang`	No	Response language (BCP 47). Supported: en, tr, de, es, hi, pt, fr, ru, zh-Hans, zh-Hant. Defaults to en. Coverage varies by domain, and a field with no translation in the requested language returns English.	en
`time`	Yes	Birth time in 24-hour HH:MM:SS format. Time is CRITICAL for Lagna (Ascendant) calculation and house divisions. It changes every two hours roughly. Even minutes matter for accurate nakshatra pada and divisional chart (D9, D10) calculations. Without exact time, Lagna and house-based predictions will be incorrect.
`compact`	No	Set true for the same data in a compact shape: arrays of same-shaped objects arrive columnar as {"__cols":[names],"__rows":[[values]]}. Lossless, typically 40 to 52 percent fewer tokens.
`ayanamsa`	No	Sidereal frame (ayanamsa) the chart is cast in. "lahiri" is Lahiri/Chitrapaksha, the traditional Vedic standard used by most software, and is the default. "raman" is the B.V. Raman ayanamsa from Hindu Predictive Astrology, about 1.45 degrees below Lahiri. "kp-newcomb" and "kp-old" are the two Krishnamurti Paddhati frames. "custom" takes your own value in degrees via ayanamsaValue, for reconciling exactly against a specific reference program. The frame rotates the whole zodiac, so a graha sitting within 1.45 degrees of a boundary can change rashi or nakshatra when you switch: pick the one your reference software uses and keep it.	lahiri
`latitude`	Yes	Birth location latitude in decimal degrees. Location determines local sidereal time for Lagna calculation and affects bhava (house) cusps. Example: Delhi 28.6139, Mumbai 19.0760, Kathmandu 27.7172.
`timezone`	No	Timezone: an IANA name (e.g. "America/New_York", "Europe/London", or `cities[0].timezone` from /location/search) or decimal hours from UTC (e.g. -5 for EST, 5.5 for IST). An IANA name is resolved to the offset in force at the given date and time. Defaults to 5.5.
`longitude`	Yes	Birth location longitude in decimal degrees. Affects local time calculations and ayanamsha adjustments. Example: Delhi 77.2090, Mumbai 72.8777, Kathmandu 85.3240.
`ayanamsaValue`	No	Custom ayanamsa value in degrees. When provided, overrides the computed ayanamsa from the selected type. Use for testing with specific ayanamsa values or matching a particular reference source.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`chart`	Yes
`frame`	Yes
`vargottama`	Yes
`vargottamaExplanation`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedSep 23, 2026

changedInput schema / properties / timezone / description

Previous value: -"Timezone: IANA name (e.g. \"America/New_York\", \"Europe/London\") OR decimal hours from UTC (e.g. -5 for EST, 1 for CET). IANA strings are resolved to the offset in force at the given date and time, so you can pass `cities[0].timezone` from /location/search directly. Defaults to 5.5."New value: +"Timezone: an IANA name (e.g. \"America/New_York\", \"Europe/London\", or `cities[0].timezone` from /location/search) or decimal hours from UTC (e.g. -5 for EST, 5.5 for IST). An IANA name is resolved to the offset in force at the given date and time. Defaults to 5.5."

Changed1 schema field changedSep 20, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "chart": {
+      "additionalProperties": {},
+      "properties": {
+        "aries": {
+          "properties": {
+            "rashi": {
+              "type": "string"
+            },
+            "signs": {
+              "items": {
+                "properties": {
+                  "graha": {
+                    "type": "string"
+                  },
+                  "house": {
+                    "maximum": 12,
+                    "minimum": 1,
+                    "type": "integer"
+                  },
+                  "isRetrograde": {
+                    "type": "boolean"
+                  },
+                  "longitude": {
+                    "type": "number"
+                  },
+                  "nakshatra": {
+                    "properties": {
+                      "key": {
+                        "type": "number"
+                      },
+                      "lord": {
+                        "enum": [
+                          "Ketu",
+                          "Venus",
+                          "Sun",
+                          "Moon",
+                          "Mars",
+                          "Rahu",
+                          "Jupiter",
+                          "Saturn",
+                          "Mercury"
+                        ],
+                        "type": "string"
+                      },
+                      "name": {
+                        "type": "string"
+                      },
+                      "pada": {
+                        "type": "number"
+                      }
+                    },
+                    "required": [
+                      "name",
+                      "pada",
+                      "key",
+                      "lord"
+                    ],
+                    "type": "object"
+                  }
+                },
+                "required": [
+                  "graha",
+                  "longitude",
+                  "nakshatra",
+                  "isRetrograde"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            }
+          },
+          "required": [
+            "rashi",
+            "signs"
+          ],
+          "type": "object"
+        },
+        "meta": {
+          "additionalProperties": {
+            "properties": {
+              "graha": {
+                "type": "string"
+              },
+              "house": {
+                "maximum": 12,
+                "minimum": 1,
+                "type": "integer"
+              },
+              "isRetrograde": {
+                "type": "boolean"
+              },
+              "longitude": {
+                "type": "number"
+              },
+              "nakshatra": {
+                "properties": {
+                  "key": {
+                    "type": "number"
+                  },
+                  "lord": {
+                    "enum": [
+                      "Ketu",
+                      "Venus",
+                      "Sun",
+                      "Moon",
+                      "Mars",
+                      "Rahu",
+                      "Jupiter",
+                      "Saturn",
+                      "Mercury"
+                    ],
+                    "type": "string"
+                  },
+                  "name": {
+                    "type": "string"
+                  },
+                  "pada": {
+                    "type": "number"
+                  }
+                },
+                "required": [
+                  "name",
+                  "pada",
+                  "key",
+                  "lord"
+                ],
+                "type": "object"
+              },
+              "rashi": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "graha",
+              "rashi",
+              "longitude",
+              "nakshatra",
+              "isRetrograde"
+            ],
+            "type": "object"
+          },
+          "type": "object"
+        }
+      },
+      "required": [
+        "meta",
+        "aries"
+      ],
+      "type": "object"
+    },
+    "frame": {
+      "properties": {
+        "ayanamsa": {
+          "type": "string"
+        },
+        "ayanamsaDegrees": {
+          "type": "number"
+        }
+      },
+      "required": [
+        "ayanamsa",
+        "ayanamsaDegrees"
+      ],
+      "type": "object"
+    },
+    "vargottama": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "vargottamaExplanation": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "chart",
+    "frame",
+    "vargottama",
+    "vargottamaExplanation"
+  ],
+  "type": "object"
+}

Changed1 schema field changedSep 16, 2026

changedInput schema / properties / timezone / description

Previous value: -"Timezone: IANA name (e.g. \"America/New_York\", \"Europe/London\") OR decimal hours from UTC (e.g. -5 for EST, 1 for CET). IANA strings are resolved to the DST-correct offset for the given date, so you can pass `cities[0].timezone` from /location/search directly. Defaults to 5.5."New value: +"Timezone: IANA name (e.g. \"America/New_York\", \"Europe/London\") OR decimal hours from UTC (e.g. -5 for EST, 1 for CET). IANA strings are resolved to the offset in force at the given date and time, so you can pass `cities[0].timezone` from /location/search directly. Defaults to 5.5."

Changed2 schema fields changedAug 25, 2026

changedInput schema / properties / lang / description

Previous value: -"Response language (ISO 639-1). Supported: en, tr, de, es, hi, pt, fr, ru. Defaults to en. Languages without translations yet return English."New value: +"Response language (BCP 47). Supported: en, tr, de, es, hi, pt, fr, ru, zh-Hans, zh-Hant. Defaults to en. Coverage varies by domain, and a field with no translation in the requested language returns English."

changedInput schema / properties / lang / enum

Previous value: -[
-  "en",
-  "tr",
-  "de",
-  "es",
-  "hi",
-  "pt",
-  "fr",
-  "ru"
-]New value: +[
+  "en",
+  "tr",
+  "de",
+  "es",
+  "hi",
+  "pt",
+  "fr",
+  "ru",
+  "zh-Hans",
+  "zh-Hant"
+]

Changed2 schema fields changedAug 17, 2026

addedInput schema / examples

Added value: +[
+  {
+    "date": "1990-07-04",
+    "latitude": 28.6139,
+    "longitude": 77.209,
+    "time": "10:12:00"
+  }
+]

changedInput schema / properties / compact / description

Previous value: -"Set true to receive the exact same data in a token-optimized shape that is cheaper for you to read: whitespace is stripped and every array of same-shaped objects is encoded columnar as {\"__cols\":[field names],\"__rows\":[[values]]}, so each field name is sent once instead of once per row. Fully lossless (no field or value is dropped or changed) and typically 40 to 52 percent fewer tokens on large results. Prefer true whenever token or inference cost matters. Default false returns standard indented JSON."New value: +"Set true for the same data in a compact shape: arrays of same-shaped objects arrive columnar as {\"__cols\":[names],\"__rows\":[[values]]}. Lossless, typically 40 to 52 percent fewer tokens."

Changed2 schema fields changedAug 2, 2026

addedInput schema / properties / ayanamsa

Added value: +{
+  "default": "lahiri",
+  "description": "Sidereal frame (ayanamsa) the chart is cast in. \"lahiri\" is Lahiri/Chitrapaksha, the traditional Vedic standard used by most software, and is the default. \"raman\" is the B.V. Raman ayanamsa from Hindu Predictive Astrology, about 1.45 degrees below Lahiri. \"kp-newcomb\" and \"kp-old\" are the two Krishnamurti Paddhati frames. \"custom\" takes your own value in degrees via ayanamsaValue, for reconciling exactly against a specific reference program. The frame rotates the whole zodiac, so a graha sitting within 1.45 degrees of a boundary can change rashi or nakshatra when you switch: pick the one your reference software uses and keep it.",
+  "enum": [
+    "kp-newcomb",
+    "kp-old",
+    "lahiri",
+    "raman",
+    "custom"
+  ],
+  "example": "lahiri",
+  "type": "string"
+}

addedInput schema / properties / ayanamsaValue

Added value: +{
+  "description": "Custom ayanamsa value in degrees. When provided, overrides the computed ayanamsa from the selected type. Use for testing with specific ayanamsa values or matching a particular reference source.",
+  "example": 24,
+  "type": "number"
+}

Changed1 schema field changedJul 22, 2026

changedInput schema / properties / compact / description

Previous value: -"Return the same data in a token-optimized compact shape (minified, with same-shaped arrays encoded columnar) to reduce LLM token cost. Lossless: no fields are dropped. Default false."New value: +"Set true to receive the exact same data in a token-optimized shape that is cheaper for you to read: whitespace is stripped and every array of same-shaped objects is encoded columnar as {\"__cols\":[field names],\"__rows\":[[values]]}, so each field name is sent once instead of once per row. Fully lossless (no field or value is dropped or changed) and typically 40 to 52 percent fewer tokens on large results. Prefer true whenever token or inference cost matters. Default false returns standard indented JSON."

Changed1 schema field changedJul 22, 2026

addedInput schema / properties / compact

Added value: +{
+  "default": false,
+  "description": "Return the same data in a token-optimized compact shape (minified, with same-shaped arrays encoded columnar) to reduce LLM token cost. Lossless: no fields are dropped. Default false.",
+  "type": "boolean"
+}

Changed2 schema fields changedJul 12, 2026

changedInput schema / properties / timezone / anyOf

Previous value: -[
-  {
-    "maximum": 14,
-    "minimum": -14,
-    "type": "number"
-  },
-  {
-    "pattern": "^[A-Za-z_]+(?:\\/[A-Za-z0-9_+-]+){0,2}$",
-    "type": "string"
-  }
-]New value: +[
+  {
+    "maximum": 14,
+    "minimum": -14,
+    "type": "number"
+  },
+  {
+    "type": "string"
+  }
+]

changedInput schema / properties / timezone / description

Previous value: -"Timezone: decimal hours from UTC (e.g. 5.5 for IST, -5 for EST) OR IANA name (e.g. \"Asia/Kolkata\", \"America/New_York\"). IANA strings are resolved to the DST-correct offset for the given date, so you can pass `cities[0].timezone` from /location/search directly. Defaults to 5.5 (IST)."New value: +"Timezone: IANA name (e.g. \"America/New_York\", \"Europe/London\") OR decimal hours from UTC (e.g. -5 for EST, 1 for CET). IANA strings are resolved to the DST-correct offset for the given date, so you can pass `cities[0].timezone` from /location/search directly. Defaults to 5.5."

First observedJul 8, 2026

TDQS

A3.5/5.0

Behavior3/5

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

Annotations already declare readOnlyHint=true and destructiveHint=false, covering the safety profile. The description adds useful feature-level context ('Detects Vargottama planets') and describes the conceptual output, but it does not disclose limitations, output-summary behavior, or edge cases beyond calculation. No contradiction with annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness2/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The first sentence is front-loaded and clear, defining the tool's purpose and scope. However, subsequent sentences ('Navamsa calculator API reveals planetary strength...', 'Each planetary position is divided into 9 parts...', 'Essential for matrimonial matching...') largely repeat the same domain purpose and calculator nature already stated, making the description padded and less concise.

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 read-only computational tool with an output schema provided, the description covers what the tool computes, its D9 scope, key features (Vargottama detection), and main use cases. Time-criticality and coordinate semantics are fully covered in parameter descriptions, so nothing essential for calling the tool correctly is missing.

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?

All 9 parameters have schema descriptions (100% coverage), so the schema carries the full semantic load. The description adds no parameter-level guidance whatsoever, so the baseline of 3 is appropriate; it neither compensates for gaps nor adds value over the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses a specific verb ('Calculate') tied to a specific resource ('Navamsa (D9 divisional chart)') and names its domain purpose: marriage compatibility analysis, spouse prediction, and spiritual life assessment. It distinguishes itself from generic divisional-chart siblings by explicitly identifying the D9 and the 9-part division.

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?

It provides clear usage context ('Essential for matrimonial matching, relationship prediction, and marital harmony analysis'), which implies when an agent would need this tool. However, it does not name alternatives (e.g., post_vedic_astrology_compatibility or post_vedic_astrology_divisional_chart) or state when not to use it, leaving exclusion conditions unstated.

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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