Muslim Prayer Reminder MCP

Check Muslim Prayer Due Status

get_prayer_status

Checks if a Muslim obligatory prayer (Fajr, Dhuhr, Asr, Maghrib, Isha) is currently due for the user location and returns active reminder details. MANDATORY: The LLM must always explicitly disclose to the user which calculation authority method was used and why it was selected (see authorityNotice in response).

Input Schema

TableJSON Schema

Name	Required	Description
`city`	No	Supported cities: makkah, madinah, riyadh, cairo, gaza, jerusalem, alquds, ramallah, hebron, nablus, rafah, khanyunis, dubai, abudhabi, kuwait, doha, amman, istanbul, london, paris, newyork, toronto, jakarta, singapore, karachi, kualalumpur, tehran, sydney, tromso. Aliases: gazacity, nyc, kuwaitcity. Case, spaces and punctuation are ignored.
`madhab`	No	Optional Asr shadow jurisprudence override (Shafi or Hanafi)
`userId`	No	Nonblank user identifier; at most 256 UTF-8 bytes and 256 characters. Whitespace in nonblank identifiers is preserved.
`latitude`	No	Optional explicit latitude override
`timezone`	No	IANA timezone; required in the same request when latitude/longitude are supplied. Must agree with the city or be compatible with the coordinate timezone lookup.
`longitude`	No	Optional explicit longitude override
`calculationMethod`	No	Optional calculation authority override (auto-resolved from location by default)

Output Schema

TableJSON Schema

Name	Required	Description
`madhab`	Yes	Active Asr jurisprudence
`prayer`	No	The name of the currently due prayer if applicable
`timezone`	Yes	Resolved IANA timezone
`localDate`	Yes	Current local date in YYYY-MM-DD
`nextPrayer`	Yes	The name of the next upcoming prayer
`reminderDue`	Yes	Whether a prayer is currently due for reminder
`expiresAtUtc`	No	UTC expiration time of the active prayer window
`reminderText`	No	Localized reminder message
`startedAtUtc`	No	UTC start time of the active prayer window
`authorityNotice`	Yes	Mandatory theological transparency notice; detailed provenance is at top level
`nextPrayerAtUtc`	Yes	UTC timestamp of the next upcoming prayer
`selectionReason`	No	Reason for authority selection
`calculationMethod`	Yes	Active calculation authority
`minuteAdjustments`	No	Applied minute adjustments
`calculationDetails`	No
`authorityDescription`	No	Description of the calculation authority
`nextPrayerCalculation`	No	Adjustment disclosure for the actual schedule of the next event, including tomorrow
`highLatitudeAdjustment`	No
`prayerWindowExpiresAtUtc`	No	End of the active prayer period; same boundary as legacy expiresAtUtc
`reminderWindowExpiresAtUtc`	No	Reminder eligibility end; exact_window is capped by the prayer period boundary. Fields appear when a reminder is emitted.

Schema Changelog

Changes observed during successful MCP inspections.

Changed12 schema fields changedOct 9, 2026

addedInput schema / dependencies

Added value: +{
+  "latitude": [
+    "longitude",
+    "timezone"
+  ],
+  "longitude": [
+    "latitude",
+    "timezone"
+  ]
+}

removedInput schema / dependentRequired

Removed value: -{
-  "latitude": [
-    "longitude",
-    "timezone"
-  ],
-  "longitude": [
-    "latitude",
-    "timezone"
-  ]
-}

changedOutput schema / properties / authorityNotice / description

Previous value: -"Mandatory theological transparency notice"New value: +"Mandatory theological transparency notice; detailed provenance is at top level"

removedOutput schema / properties / authorityNotice / properties / calculationDetails

Removed value: -{
-  "additionalProperties": false,
-  "properties": {
-    "appliedMinuteAdjustments": {
-      "additionalProperties": {
-        "type": "number"
-      },
-      "propertyNames": {
-        "type": "string"
-      },
-      "type": "object"
-    },
-    "calendarAlignmentAdjusted": {
-      "type": "boolean"
-    },
-    "customMinuteAdjustments": {
-      "additionalProperties": false,
-      "properties": {
-        "asr": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "dhuhr": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "fajr": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "isha": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "maghrib": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "sunrise": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        }
-      },
-      "type": "object"
-    },
-    "expectedTimezone": {
-      "description": "Timezone from city registry or approximate coordinate lookup",
-      "type": "string"
-    },
-    "fallbackLocationUsed": {
-      "type": "boolean"
-    },
-    "highLatitudeRuleSource": {
-      "enum": [
-        "stored_preference",
-        "geographic_default"
-      ],
-      "type": "string"
-    },
-    "locationBasis": {
-      "enum": [
-        "explicit_coordinates",
-        "explicit_city",
-        "stored_fixed_coordinates",
-        "stored_fixed_city",
-        "host_coordinates",
-        "host_city",
-        "network_geolocation",
-        "default_location"
-      ],
-      "type": "string"
-    },
-    "locationIsApproximate": {
-      "type": "boolean"
-    },
-    "madhabSource": {
-      "enum": [
-        "explicit_override",
-        "stored_preference",
-        "geographic_default"
-      ],
-      "type": "string"
-    },
-    "methodMinuteAdjustments": {
-      "additionalProperties": false,
-      "properties": {
-        "asr": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "dhuhr": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "fajr": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "isha": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "maghrib": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "sunrise": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        }
-      },
-      "type": "object"
-    },
-    "methodSource": {
-      "enum": [
-        "explicit_override",
-        "stored_preference",
-        "geographic_default"
-      ],
-      "type": "string"
-    },
-    "regionalMinuteAdjustments": {
-      "additionalProperties": false,
-      "properties": {
-        "asr": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "dhuhr": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "fajr": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "isha": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "maghrib": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "sunrise": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        }
-      },
-      "type": "object"
-    },
-    "timezoneSource": {
-      "description": "Source of the validated timezone or disclosed ocean/pole choice",
-      "enum": [
-        "explicit_override",
-        "stored_preference",
-        "city_default",
-        "host_header"
-      ],
-      "type": "string"
-    },
-    "timezoneValidation": {
-      "description": "Validation basis; ocean and mathematical-pole locations retain caller-selected civil timezone with explicit disclosure",
-      "enum": [
-        "coordinate_lookup",
-        "nearby_boundary",
-        "city_registry",
-        "polar_choice",
-        "ocean_choice"
-      ],
-      "type": "string"
-    }
-  },
-  "type": "object"
-}

removedOutput schema / properties / authorityNotice / properties / highLatitudeAdjustment

Removed value: -{
-  "additionalProperties": false,
-  "properties": {
-    "adjustedPrayers": {
-      "items": {
-        "enum": [
-          "Fajr",
-          "Sunrise",
-          "Dhuhr",
-          "Asr",
-          "Maghrib",
-          "Isha"
-        ],
-        "type": "string"
-      },
-      "type": "array"
-    },
-    "applied": {
-      "type": "boolean"
-    },
-    "astronomicalLatitudeClamped": {
-      "type": "boolean"
-    },
-    "effectiveLatitude": {
-      "anyOf": [
-        {
-          "const": 48,
-          "type": "number"
-        },
-        {
-          "const": -48,
-          "type": "number"
-        }
-      ],
-      "description": "Substitute latitude only; never the user coordinate"
-    },
-    "explanation": {
-      "type": "string"
-    },
-    "methodSpecificTwilightRule": {
-      "const": "MoonsightingCommittee",
-      "type": "string"
-    },
-    "rule": {
-      "enum": [
-        "MiddleOfTheNight",
-        "SeventhOfTheNight",
-        "TwilightAngle"
-      ],
-      "type": "string"
-    }
-  },
-  "required": [
-    "applied",
-    "rule",
-    "astronomicalLatitudeClamped",
-    "adjustedPrayers",
-    "explanation"
-  ],
-  "type": "object"
-}

changedOutput schema / properties / calculationDetails / properties / timezoneValidation / description

Previous value: -"Validation basis; ocean and mathematical-pole locations retain caller-selected civil timezone with explicit disclosure"New value: +"Validation basis; ocean locations require the matching nautical timezone or an adjacent coastal civil timezone; mathematical poles allow an explicit civil timezone with disclosure"

removedOutput schema / properties / nextPrayerCalculation / properties / authorityNotice / properties / calculationDetails

Removed value: -{
-  "additionalProperties": false,
-  "properties": {
-    "appliedMinuteAdjustments": {
-      "additionalProperties": {
-        "type": "number"
-      },
-      "propertyNames": {
-        "type": "string"
-      },
-      "type": "object"
-    },
-    "calendarAlignmentAdjusted": {
-      "type": "boolean"
-    },
-    "customMinuteAdjustments": {
-      "additionalProperties": false,
-      "properties": {
-        "asr": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "dhuhr": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "fajr": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "isha": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "maghrib": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "sunrise": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        }
-      },
-      "type": "object"
-    },
-    "expectedTimezone": {
-      "description": "Timezone from city registry or approximate coordinate lookup",
-      "type": "string"
-    },
-    "fallbackLocationUsed": {
-      "type": "boolean"
-    },
-    "highLatitudeRuleSource": {
-      "enum": [
-        "stored_preference",
-        "geographic_default"
-      ],
-      "type": "string"
-    },
-    "locationBasis": {
-      "enum": [
-        "explicit_coordinates",
-        "explicit_city",
-        "stored_fixed_coordinates",
-        "stored_fixed_city",
-        "host_coordinates",
-        "host_city",
-        "network_geolocation",
-        "default_location"
-      ],
-      "type": "string"
-    },
-    "locationIsApproximate": {
-      "type": "boolean"
-    },
-    "madhabSource": {
-      "enum": [
-        "explicit_override",
-        "stored_preference",
-        "geographic_default"
-      ],
-      "type": "string"
-    },
-    "methodMinuteAdjustments": {
-      "additionalProperties": false,
-      "properties": {
-        "asr": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "dhuhr": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "fajr": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "isha": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "maghrib": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "sunrise": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        }
-      },
-      "type": "object"
-    },
-    "methodSource": {
-      "enum": [
-        "explicit_override",
-        "stored_preference",
-        "geographic_default"
-      ],
-      "type": "string"
-    },
-    "regionalMinuteAdjustments": {
-      "additionalProperties": false,
-      "properties": {
-        "asr": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "dhuhr": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "fajr": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "isha": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "maghrib": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        },
-        "sunrise": {
-          "maximum": 60,
-          "minimum": -60,
-          "type": "integer"
-        }
-      },
-      "type": "object"
-    },
-    "timezoneSource": {
-      "description": "Source of the validated timezone or disclosed ocean/pole choice",
-      "enum": [
-        "explicit_override",
-        "stored_preference",
-        "city_default",
-        "host_header"
-      ],
-      "type": "string"
-    },
-    "timezoneValidation": {
-      "description": "Validation basis; ocean and mathematical-pole locations retain caller-selected civil timezone with explicit disclosure",
-      "enum": [
-        "coordinate_lookup",
-        "nearby_boundary",
-        "city_registry",
-        "polar_choice",
-        "ocean_choice"
-      ],
-      "type": "string"
-    }
-  },
-  "type": "object"
-}

removedOutput schema / properties / nextPrayerCalculation / properties / authorityNotice / properties / highLatitudeAdjustment

Removed value: -{
-  "additionalProperties": false,
-  "properties": {
-    "adjustedPrayers": {
-      "items": {
-        "enum": [
-          "Fajr",
-          "Sunrise",
-          "Dhuhr",
-          "Asr",
-          "Maghrib",
-          "Isha"
-        ],
-        "type": "string"
-      },
-      "type": "array"
-    },
-    "applied": {
-      "type": "boolean"
-    },
-    "astronomicalLatitudeClamped": {
-      "type": "boolean"
-    },
-    "effectiveLatitude": {
-      "anyOf": [
-        {
-          "const": 48,
-          "type": "number"
-        },
-        {
-          "const": -48,
-          "type": "number"
-        }
-      ],
-      "description": "Substitute latitude only; never the user coordinate"
-    },
-    "explanation": {
-      "type": "string"
-    },
-    "methodSpecificTwilightRule": {
-      "const": "MoonsightingCommittee",
-      "type": "string"
-    },
-    "rule": {
-      "enum": [
-        "MiddleOfTheNight",
-        "SeventhOfTheNight",
-        "TwilightAngle"
-      ],
-      "type": "string"
-    }
-  },
-  "required": [
-    "applied",
-    "rule",
-    "astronomicalLatitudeClamped",
-    "adjustedPrayers",
-    "explanation"
-  ],
-  "type": "object"
-}

changed

Output schema / properties / nextPrayerCalculation / properties / calculationDetails / properties / timezoneValidation / description

Previous value: -"Validation basis; ocean and mathematical-pole locations retain caller-selected civil timezone with explicit disclosure"New value: +"Validation basis; ocean locations require the matching nautical timezone or an adjacent coastal civil timezone; mathematical poles allow an explicit civil timezone with disclosure"

addedOutput schema / properties / nextPrayerCalculation / properties / usesCurrentCalculation

Added value: +{
+  "description": "If true, this next event uses the top-level calculationDetails, highLatitudeAdjustment and authorityNotice; duplicate fields are omitted. Otherwise its own distinct metadata is included.",
+  "type": "boolean"
+}

changedOutput schema / properties / nextPrayerCalculation / required

Previous value: -[
-  "localDate"
-]New value: +[
+  "localDate",
+  "usesCurrentCalculation"
+]

changedOutput schema / required

Previous value: -[
-  "reminderDue",
-  "localDate",
-  "nextPrayer",
-  "nextPrayerAtUtc",
-  "timezone",
-  "calculationMethod",
-  "madhab"
-]New value: +[
+  "reminderDue",
+  "localDate",
+  "nextPrayer",
+  "nextPrayerAtUtc",
+  "timezone",
+  "calculationMethod",
+  "madhab",
+  "authorityNotice"
+]

Changed16 schema fields changedOct 3, 2026

addedInput schema / allOf

Added value: +[
+  {
+    "not": {
+      "required": [
+        "city",
+        "latitude"
+      ]
+    }
+  },
+  {
+    "not": {
+      "required": [
+        "city",
+        "longitude"
+      ]
+    }
+  }
+]

addedInput schema / dependentRequired

Added value: +{
+  "latitude": [
+    "longitude",
+    "timezone"
+  ],
+  "longitude": [
+    "latitude",
+    "timezone"
+  ]
+}

changedInput schema / properties / timezone / description

Previous value: -"IANA timezone; required in the same request when latitude/longitude are supplied. Explicit overrides select the display timezone."New value: +"IANA timezone; required in the same request when latitude/longitude are supplied. Must agree with the city or be compatible with the coordinate timezone lookup."

addedInput schema / properties / userId / pattern
```
Added value: +"\\S"
```

addedOutput schema / properties / authorityNotice / properties / calculationDetails / properties / expectedTimezone

Added value: +{
+  "description": "Timezone from city registry or approximate coordinate lookup",
+  "type": "string"
+}

changed

Output schema / properties / authorityNotice / properties / calculationDetails / properties / timezoneSource / description

Previous value: -"Source of the display timezone; caller-selected overrides are not geographically validated."New value: +"Source of the validated timezone or disclosed ocean/pole choice"

addedOutput schema / properties / authorityNotice / properties / calculationDetails / properties / timezoneValidation

Added value: +{
+  "description": "Validation basis; ocean and mathematical-pole locations retain caller-selected civil timezone with explicit disclosure",
+  "enum": [
+    "coordinate_lookup",
+    "nearby_boundary",
+    "city_registry",
+    "polar_choice",
+    "ocean_choice"
+  ],
+  "type": "string"
+}

addedOutput schema / properties / calculationDetails / properties / expectedTimezone

Added value: +{
+  "description": "Timezone from city registry or approximate coordinate lookup",
+  "type": "string"
+}

changedOutput schema / properties / calculationDetails / properties / timezoneSource / description

Previous value: -"Source of the display timezone; caller-selected overrides are not geographically validated."New value: +"Source of the validated timezone or disclosed ocean/pole choice"

addedOutput schema / properties / calculationDetails / properties / timezoneValidation

Added value: +{
+  "description": "Validation basis; ocean and mathematical-pole locations retain caller-selected civil timezone with explicit disclosure",
+  "enum": [
+    "coordinate_lookup",
+    "nearby_boundary",
+    "city_registry",
+    "polar_choice",
+    "ocean_choice"
+  ],
+  "type": "string"
+}

addedOutput schema / properties / nextPrayerCalculation / properties / authorityNotice / properties / calculationDetails / properties / expectedTimezone
```
Added value: +{
+  "description": "Timezone from city registry or approximate coordinate lookup",
+  "type": "string"
+}
```

changed

Output schema / properties / nextPrayerCalculation / properties / authorityNotice / properties / calculationDetails / properties / timezoneSource / description

Previous value: -"Source of the display timezone; caller-selected overrides are not geographically validated."New value: +"Source of the validated timezone or disclosed ocean/pole choice"

added

Output schema / properties / nextPrayerCalculation / properties / authorityNotice / properties / calculationDetails / properties / timezoneValidation

Added value: +{
+  "description": "Validation basis; ocean and mathematical-pole locations retain caller-selected civil timezone with explicit disclosure",
+  "enum": [
+    "coordinate_lookup",
+    "nearby_boundary",
+    "city_registry",
+    "polar_choice",
+    "ocean_choice"
+  ],
+  "type": "string"
+}

addedOutput schema / properties / nextPrayerCalculation / properties / calculationDetails / properties / expectedTimezone

Added value: +{
+  "description": "Timezone from city registry or approximate coordinate lookup",
+  "type": "string"
+}

changed

Output schema / properties / nextPrayerCalculation / properties / calculationDetails / properties / timezoneSource / description

Previous value: -"Source of the display timezone; caller-selected overrides are not geographically validated."New value: +"Source of the validated timezone or disclosed ocean/pole choice"

addedOutput schema / properties / nextPrayerCalculation / properties / calculationDetails / properties / timezoneValidation

Added value: +{
+  "description": "Validation basis; ocean and mathematical-pole locations retain caller-selected civil timezone with explicit disclosure",
+  "enum": [
+    "coordinate_lookup",
+    "nearby_boundary",
+    "city_registry",
+    "polar_choice",
+    "ocean_choice"
+  ],
+  "type": "string"
+}

Changed10 schema fields changedOct 3, 2026

changedInput schema / properties / city / description

Previous value: -"Supported predefined city. Supply city or coordinates with an IANA timezone; connector/IP geolocation is never used."New value: +"Supported cities: makkah, madinah, riyadh, cairo, gaza, jerusalem, alquds, ramallah, hebron, nablus, rafah, khanyunis, dubai, abudhabi, kuwait, doha, amman, istanbul, london, paris, newyork, toronto, jakarta, singapore, karachi, kualalumpur, tehran, sydney, tromso. Aliases: gazacity, nyc, kuwaitcity. Case, spaces and punctuation are ignored."

changedInput schema / properties / timezone / description

Previous value: -"Optional IANA timezone override (e.g. Asia/Riyadh)"New value: +"IANA timezone; required in the same request when latitude/longitude are supplied. Explicit overrides select the display timezone."

changedInput schema / properties / userId / description

Previous value: -"Optional unique user identifier to load stored preferences. If omitted, pure geographic auto-resolution is applied."New value: +"Nonblank user identifier; at most 256 UTF-8 bytes and 256 characters. Whitespace in nonblank identifiers is preserved."

addedInput schema / properties / userId / maxLength
```
Added value: +256
```

addedOutput schema / properties / authorityNotice / properties / calculationDetails / properties / timezoneSource

Added value: +{
+  "description": "Source of the display timezone; caller-selected overrides are not geographically validated.",
+  "enum": [
+    "explicit_override",
+    "stored_preference",
+    "city_default",
+    "host_header"
+  ],
+  "type": "string"
+}

addedOutput schema / properties / calculationDetails / properties / timezoneSource

Added value: +{
+  "description": "Source of the display timezone; caller-selected overrides are not geographically validated.",
+  "enum": [
+    "explicit_override",
+    "stored_preference",
+    "city_default",
+    "host_header"
+  ],
+  "type": "string"
+}

added

Output schema / properties / nextPrayerCalculation / properties / authorityNotice / properties / calculationDetails / properties / timezoneSource

Added value: +{
+  "description": "Source of the display timezone; caller-selected overrides are not geographically validated.",
+  "enum": [
+    "explicit_override",
+    "stored_preference",
+    "city_default",
+    "host_header"
+  ],
+  "type": "string"
+}

addedOutput schema / properties / nextPrayerCalculation / properties / calculationDetails / properties / timezoneSource

Added value: +{
+  "description": "Source of the display timezone; caller-selected overrides are not geographically validated.",
+  "enum": [
+    "explicit_override",
+    "stored_preference",
+    "city_default",
+    "host_header"
+  ],
+  "type": "string"
+}

addedOutput schema / properties / prayerWindowExpiresAtUtc

Added value: +{
+  "description": "End of the active prayer period; same boundary as legacy expiresAtUtc",
+  "type": "string"
+}

addedOutput schema / properties / reminderWindowExpiresAtUtc

Added value: +{
+  "description": "Reminder eligibility end; exact_window is capped by the prayer period boundary. Fields appear when a reminder is emitted.",
+  "type": "string"
+}

Changed6 schema fields changedOct 2, 2026

addedInput schema / properties / city

Added value: +{
+  "description": "Supported predefined city. Supply city or coordinates with an IANA timezone; connector/IP geolocation is never used.",
+  "type": "string"
+}

addedOutput schema / properties / authorityNotice / properties / calculationDetails

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "appliedMinuteAdjustments": {
+      "additionalProperties": {
+        "type": "number"
+      },
+      "propertyNames": {
+        "type": "string"
+      },
+      "type": "object"
+    },
+    "calendarAlignmentAdjusted": {
+      "type": "boolean"
+    },
+    "customMinuteAdjustments": {
+      "additionalProperties": false,
+      "properties": {
+        "asr": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "dhuhr": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "fajr": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "isha": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "maghrib": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "sunrise": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        }
+      },
+      "type": "object"
+    },
+    "fallbackLocationUsed": {
+      "type": "boolean"
+    },
+    "highLatitudeRuleSource": {
+      "enum": [
+        "stored_preference",
+        "geographic_default"
+      ],
+      "type": "string"
+    },
+    "locationBasis": {
+      "enum": [
+        "explicit_coordinates",
+        "explicit_city",
+        "stored_fixed_coordinates",
+        "stored_fixed_city",
+        "host_coordinates",
+        "host_city",
+        "network_geolocation",
+        "default_location"
+      ],
+      "type": "string"
+    },
+    "locationIsApproximate": {
+      "type": "boolean"
+    },
+    "madhabSource": {
+      "enum": [
+        "explicit_override",
+        "stored_preference",
+        "geographic_default"
+      ],
+      "type": "string"
+    },
+    "methodMinuteAdjustments": {
+      "additionalProperties": false,
+      "properties": {
+        "asr": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "dhuhr": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "fajr": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "isha": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "maghrib": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "sunrise": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        }
+      },
+      "type": "object"
+    },
+    "methodSource": {
+      "enum": [
+        "explicit_override",
+        "stored_preference",
+        "geographic_default"
+      ],
+      "type": "string"
+    },
+    "regionalMinuteAdjustments": {
+      "additionalProperties": false,
+      "properties": {
+        "asr": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "dhuhr": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "fajr": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "isha": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "maghrib": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "sunrise": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        }
+      },
+      "type": "object"
+    }
+  },
+  "type": "object"
+}

addedOutput schema / properties / authorityNotice / properties / highLatitudeAdjustment

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "adjustedPrayers": {
+      "items": {
+        "enum": [
+          "Fajr",
+          "Sunrise",
+          "Dhuhr",
+          "Asr",
+          "Maghrib",
+          "Isha"
+        ],
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "applied": {
+      "type": "boolean"
+    },
+    "astronomicalLatitudeClamped": {
+      "type": "boolean"
+    },
+    "effectiveLatitude": {
+      "anyOf": [
+        {
+          "const": 48,
+          "type": "number"
+        },
+        {
+          "const": -48,
+          "type": "number"
+        }
+      ],
+      "description": "Substitute latitude only; never the user coordinate"
+    },
+    "explanation": {
+      "type": "string"
+    },
+    "methodSpecificTwilightRule": {
+      "const": "MoonsightingCommittee",
+      "type": "string"
+    },
+    "rule": {
+      "enum": [
+        "MiddleOfTheNight",
+        "SeventhOfTheNight",
+        "TwilightAngle"
+      ],
+      "type": "string"
+    }
+  },
+  "required": [
+    "applied",
+    "rule",
+    "astronomicalLatitudeClamped",
+    "adjustedPrayers",
+    "explanation"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / calculationDetails

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "appliedMinuteAdjustments": {
+      "additionalProperties": {
+        "type": "number"
+      },
+      "propertyNames": {
+        "type": "string"
+      },
+      "type": "object"
+    },
+    "calendarAlignmentAdjusted": {
+      "type": "boolean"
+    },
+    "customMinuteAdjustments": {
+      "additionalProperties": false,
+      "properties": {
+        "asr": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "dhuhr": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "fajr": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "isha": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "maghrib": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "sunrise": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        }
+      },
+      "type": "object"
+    },
+    "fallbackLocationUsed": {
+      "type": "boolean"
+    },
+    "highLatitudeRuleSource": {
+      "enum": [
+        "stored_preference",
+        "geographic_default"
+      ],
+      "type": "string"
+    },
+    "locationBasis": {
+      "enum": [
+        "explicit_coordinates",
+        "explicit_city",
+        "stored_fixed_coordinates",
+        "stored_fixed_city",
+        "host_coordinates",
+        "host_city",
+        "network_geolocation",
+        "default_location"
+      ],
+      "type": "string"
+    },
+    "locationIsApproximate": {
+      "type": "boolean"
+    },
+    "madhabSource": {
+      "enum": [
+        "explicit_override",
+        "stored_preference",
+        "geographic_default"
+      ],
+      "type": "string"
+    },
+    "methodMinuteAdjustments": {
+      "additionalProperties": false,
+      "properties": {
+        "asr": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "dhuhr": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "fajr": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "isha": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "maghrib": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "sunrise": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        }
+      },
+      "type": "object"
+    },
+    "methodSource": {
+      "enum": [
+        "explicit_override",
+        "stored_preference",
+        "geographic_default"
+      ],
+      "type": "string"
+    },
+    "regionalMinuteAdjustments": {
+      "additionalProperties": false,
+      "properties": {
+        "asr": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "dhuhr": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "fajr": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "isha": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "maghrib": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        },
+        "sunrise": {
+          "maximum": 60,
+          "minimum": -60,
+          "type": "integer"
+        }
+      },
+      "type": "object"
+    }
+  },
+  "type": "object"
+}

addedOutput schema / properties / highLatitudeAdjustment

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "adjustedPrayers": {
+      "items": {
+        "enum": [
+          "Fajr",
+          "Sunrise",
+          "Dhuhr",
+          "Asr",
+          "Maghrib",
+          "Isha"
+        ],
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "applied": {
+      "type": "boolean"
+    },
+    "astronomicalLatitudeClamped": {
+      "type": "boolean"
+    },
+    "effectiveLatitude": {
+      "anyOf": [
+        {
+          "const": 48,
+          "type": "number"
+        },
+        {
+          "const": -48,
+          "type": "number"
+        }
+      ],
+      "description": "Substitute latitude only; never the user coordinate"
+    },
+    "explanation": {
+      "type": "string"
+    },
+    "methodSpecificTwilightRule": {
+      "const": "MoonsightingCommittee",
+      "type": "string"
+    },
+    "rule": {
+      "enum": [
+        "MiddleOfTheNight",
+        "SeventhOfTheNight",
+        "TwilightAngle"
+      ],
+      "type": "string"
+    }
+  },
+  "required": [
+    "applied",
+    "rule",
+    "astronomicalLatitudeClamped",
+    "adjustedPrayers",
+    "explanation"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / nextPrayerCalculation

Added value: +{
+  "additionalProperties": false,
+  "description": "Adjustment disclosure for the actual schedule of the next event, including tomorrow",
+  "properties": {
+    "authorityNotice": {
+      "additionalProperties": false,
+      "properties": {
+        "authorityDescription": {
+          "description": "Full descriptive name of the calculation authority",
+          "type": "string"
+        },
+        "calculationDetails": {
+          "additionalProperties": false,
+          "properties": {
+            "appliedMinuteAdjustments": {
+              "additionalProperties": {
+                "type": "number"
+              },
+              "propertyNames": {
+                "type": "string"
+              },
+              "type": "object"
+            },
+            "calendarAlignmentAdjusted": {
+              "type": "boolean"
+            },
+            "customMinuteAdjustments": {
+              "additionalProperties": false,
+              "properties": {
+                "asr": {
+                  "maximum": 60,
+                  "minimum": -60,
+                  "type": "integer"
+                },
+                "dhuhr": {
+                  "maximum": 60,
+                  "minimum": -60,
+                  "type": "integer"
+                },
+                "fajr": {
+                  "maximum": 60,
+                  "minimum": -60,
+                  "type": "integer"
+                },
+                "isha": {
+                  "maximum": 60,
+                  "minimum": -60,
+                  "type": "integer"
+                },
+                "maghrib": {
+                  "maximum": 60,
+                  "minimum": -60,
+                  "type": "integer"
+                },
+                "sunrise": {
+                  "maximum": 60,
+                  "minimum": -60,
+                  "type": "integer"
+                }
+              },
+              "type": "object"
+            },
+            "fallbackLocationUsed": {
+              "type": "boolean"
+            },
+            "highLatitudeRuleSource": {
+              "enum": [
+                "stored_preference",
+                "geographic_default"
+              ],
+              "type": "string"
+            },
+            "locationBasis": {
+              "enum": [
+                "explicit_coordinates",
+                "explicit_city",
+                "stored_fixed_coordinates",
+                "stored_fixed_city",
+                "host_coordinates",
+                "host_city",
+                "network_geolocation",
+                "default_location"
+              ],
+              "type": "string"
+            },
+            "locationIsApproximate": {
+              "type": "boolean"
+            },
+            "madhabSource": {
+              "enum": [
+                "explicit_override",
+                "stored_preference",
+                "geographic_default"
+              ],
+              "type": "string"
+            },
+            "methodMinuteAdjustments": {
+              "additionalProperties": false,
+              "properties": {
+                "asr": {
+                  "maximum": 60,
+                  "minimum": -60,
+                  "type": "integer"
+                },
+                "dhuhr": {
+                  "maximum": 60,
+                  "minimum": -60,
+                  "type": "integer"
+                },
+                "fajr": {
+                  "maximum": 60,
+                  "minimum": -60,
+                  "type": "integer"
+                },
+                "isha": {
+                  "maximum": 60,
+                  "minimum": -60,
+                  "type": "integer"
+                },
+                "maghrib": {
+                  "maximum": 60,
+                  "minimum": -60,
+                  "type": "integer"
+                },
+                "sunrise": {
+                  "maximum": 60,
+                  "minimum": -60,
+                  "type": "integer"
+                }
+              },
+              "type": "object"
+            },
+            "methodSource": {
+              "enum": [
+                "explicit_override",
+                "stored_preference",
+                "geographic_default"
+              ],
+              "type": "string"
+            },
+            "regionalMinuteAdjustments": {
+              "additionalProperties": false,
+              "properties": {
+                "asr": {
+                  "maximum": 60,
+                  "minimum": -60,
+                  "type": "integer"
+                },
+                "dhuhr": {
+                  "maximum": 60,
+                  "minimum": -60,
+                  "type": "integer"
+                },
+                "fajr": {
+                  "maximum": 60,
+                  "minimum": -60,
+                  "type": "integer"
+                },
+                "isha": {
+                  "maximum": 60,
+                  "minimum": -60,
+                  "type": "integer"
+                },
+                "maghrib": {
+                  "maximum": 60,
+                  "minimum": -60,
+                  "type": "integer"
+                },
+                "sunrise": {
+                  "maximum": 60,
+                  "minimum": -60,
+                  "type": "integer"
+                }
+              },
+              "type": "object"
+            }
+          },
+          "type": "object"
+        },
+        "highLatitudeAdjustment": {
+          "additionalProperties": false,
+          "properties": {
+            "adjustedPrayers": {
+              "items": {
+                "enum": [
+                  "Fajr",
+                  "Sunrise",
+                  "Dhuhr",
+                  "Asr",
+                  "Maghrib",
+                  "Isha"
+                ],
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "applied": {
+              "type": "boolean"
+            },
+            "astronomicalLatitudeClamped": {
+              "type": "boolean"
+            },
+            "effectiveLatitude": {
+              "anyOf": [
+                {
+                  "const": 48,
+                  "type": "number"
+                },
+                {
+                  "const": -48,
+                  "type": "number"
+                }
+              ],
+              "description": "Substitute latitude only; never the user coordinate"
+            },
+            "explanation": {
+              "type": "string"
+            },
+            "methodSpecificTwilightRule": {
+              "const": "MoonsightingCommittee",
+              "type": "string"
+            },
+            "rule": {
+              "enum": [
+                "MiddleOfTheNight",
+                "SeventhOfTheNight",
+                "TwilightAngle"
+              ],
+              "type": "string"
+            }
+          },
+          "required": [
+            "applied",
+            "rule",
+            "astronomicalLatitudeClamped",
+            "adjustedPrayers",
+            "explanation"
+          ],
+          "type": "object"
+        },
+        "madhab": {
+          "description": "The Asr jurisprudence school",
+          "enum": [
+            "Shafi",
+            "Hanafi"
+          ],
+          "type": "string"
+        },
+        "method": {
+          "description": "The calculation authority method",
+          "enum": [
+            "UmmAlQura",
+            "MuslimWorldLeague",
+            "Egyptian",
+            "Karachi",
+            "NorthAmerica",
+            "Dubai",
+            "Qatar",
+            "Kuwait",
+            "MoonsightingCommittee",
+            "Singapore",
+            "Turkey",
+            "Tehran"
+          ],
+          "type": "string"
+        },
+        "requiredDisplayInstruction": {
+          "description": "Mandatory theological notice for AI presentation",
+          "type": "string"
+        },
+        "selectionReason": {
+          "description": "Rationale for selecting this authority",
+          "type": "string"
+        }
+      },
+      "required": [
+        "method",
+        "madhab",
+        "authorityDescription",
+        "selectionReason",
+        "requiredDisplayInstruction"
+      ],
+      "type": "object"
+    },
+    "calculationDetails": {
+      "additionalProperties": false,
+      "properties": {
+        "appliedMinuteAdjustments": {
+          "additionalProperties": {
+            "type": "number"
+          },
+          "propertyNames": {
+            "type": "string"
+          },
+          "type": "object"
+        },
+        "calendarAlignmentAdjusted": {
+          "type": "boolean"
+        },
+        "customMinuteAdjustments": {
+          "additionalProperties": false,
+          "properties": {
+            "asr": {
+              "maximum": 60,
+              "minimum": -60,
+              "type": "integer"
+            },
+            "dhuhr": {
+              "maximum": 60,
+              "minimum": -60,
+              "type": "integer"
+            },
+            "fajr": {
+              "maximum": 60,
+              "minimum": -60,
+              "type": "integer"
+            },
+            "isha": {
+              "maximum": 60,
+              "minimum": -60,
+              "type": "integer"
+            },
+            "maghrib": {
+              "maximum": 60,
+              "minimum": -60,
+              "type": "integer"
+            },
+            "sunrise": {
+              "maximum": 60,
+              "minimum": -60,
+              "type": "integer"
+            }
+          },
+          "type": "object"
+        },
+        "fallbackLocationUsed": {
+          "type": "boolean"
+        },
+        "highLatitudeRuleSource": {
+          "enum": [
+            "stored_preference",
+            "geographic_default"
+          ],
+          "type": "string"
+        },
+        "locationBasis": {
+          "enum": [
+            "explicit_coordinates",
+            "explicit_city",
+            "stored_fixed_coordinates",
+            "stored_fixed_city",
+            "host_coordinates",
+            "host_city",
+            "network_geolocation",
+            "default_location"
+          ],
+          "type": "string"
+        },
+        "locationIsApproximate": {
+          "type": "boolean"
+        },
+        "madhabSource": {
+          "enum": [
+            "explicit_override",
+            "stored_preference",
+            "geographic_default"
+          ],
+          "type": "string"
+        },
+        "methodMinuteAdjustments": {
+          "additionalProperties": false,
+          "properties": {
+            "asr": {
+              "maximum": 60,
+              "minimum": -60,
+              "type": "integer"
+            },
+            "dhuhr": {
+              "maximum": 60,
+              "minimum": -60,
+              "type": "integer"
+            },
+            "fajr": {
+              "maximum": 60,
+              "minimum": -60,
+              "type": "integer"
+            },
+            "isha": {
+              "maximum": 60,
+              "minimum": -60,
+              "type": "integer"
+            },
+            "maghrib": {
+              "maximum": 60,
+              "minimum": -60,
+              "type": "integer"
+            },
+            "sunrise": {
+              "maximum": 60,
+              "minimum": -60,
+              "type": "integer"
+            }
+          },
+          "type": "object"
+        },
+        "methodSource": {
+          "enum": [
+            "explicit_override",
+            "stored_preference",
+            "geographic_default"
+          ],
+          "type": "string"
+        },
+        "regionalMinuteAdjustments": {
+          "additionalProperties": false,
+          "properties": {
+            "asr": {
+              "maximum": 60,
+              "minimum": -60,
+              "type": "integer"
+            },
+            "dhuhr": {
+              "maximum": 60,
+              "minimum": -60,
+              "type": "integer"
+            },
+            "fajr": {
+              "maximum": 60,
+              "minimum": -60,
+              "type": "integer"
+            },
+            "isha": {
+              "maximum": 60,
+              "minimum": -60,
+              "type": "integer"
+            },
+            "maghrib": {
+              "maximum": 60,
+              "minimum": -60,
+              "type": "integer"
+            },
+            "sunrise": {
+              "maximum": 60,
+              "minimum": -60,
+              "type": "integer"
+            }
+          },
+          "type": "object"
+        }
+      },
+      "type": "object"
+    },
+    "highLatitudeAdjustment": {
+      "additionalProperties": false,
+      "properties": {
+        "adjustedPrayers": {
+          "items": {
+            "enum": [
+              "Fajr",
+              "Sunrise",
+              "Dhuhr",
+              "Asr",
+              "Maghrib",
+              "Isha"
+            ],
+            "type": "string"
+          },
+          "type": "array"
+        },
+        "applied": {
+          "type": "boolean"
+        },
+        "astronomicalLatitudeClamped": {
+          "type": "boolean"
+        },
+        "effectiveLatitude": {
+          "anyOf": [
+            {
+              "const": 48,
+              "type": "number"
+            },
+            {
+              "const": -48,
+              "type": "number"
+            }
+          ],
+          "description": "Substitute latitude only; never the user coordinate"
+        },
+        "explanation": {
+          "type": "string"
+        },
+        "methodSpecificTwilightRule": {
+          "const": "MoonsightingCommittee",
+          "type": "string"
+        },
+        "rule": {
+          "enum": [
+            "MiddleOfTheNight",
+            "SeventhOfTheNight",
+            "TwilightAngle"
+          ],
+          "type": "string"
+        }
+      },
+      "required": [
+        "applied",
+        "rule",
+        "astronomicalLatitudeClamped",
+        "adjustedPrayers",
+        "explanation"
+      ],
+      "type": "object"
+    },
+    "localDate": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "localDate"
+  ],
+  "type": "object"
+}

Changed1 schema field changedOct 1, 2026
- addedInput schema / properties / userId / minLength
```
Added value: +1
```

Changed1 schema field changedOct 1, 2026

addedInput schema / properties / userId

Added value: +{
+  "description": "Optional unique user identifier to load stored preferences. If omitted, pure geographic auto-resolution is applied.",
+  "type": "string"
+}

Changed4 schema fields changedSep 18, 2026

removedInput schema / properties / userId

Removed value: -{
-  "description": "Unique user or device ID for preference and deduplication tracking",
-  "type": "string"
-}

removedOutput schema / properties / dedupeKey

Removed value: -{
-  "description": "Deduplication cache key",
-  "type": "string"
-}

removedOutput schema / properties / locationSource

Removed value: -{
-  "description": "Source of location resolution",
-  "type": "string"
-}

changedOutput schema / required

Previous value: -[
-  "reminderDue",
-  "localDate",
-  "nextPrayer",
-  "nextPrayerAtUtc",
-  "timezone",
-  "calculationMethod",
-  "madhab",
-  "locationSource"
-]New value: +[
+  "reminderDue",
+  "localDate",
+  "nextPrayer",
+  "nextPrayerAtUtc",
+  "timezone",
+  "calculationMethod",
+  "madhab"
+]

Changed1 schema field changedSep 6, 2026
- removedInput schema / additionalProperties
```
Removed value: -false
```
First observedSep 6, 2026

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