Almanack

Server Details

Date math and SVG rendering for fictional and custom calendars. Exact, stateless and deterministic.

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Status: Unhealthy
Last Tested: 2026-09-20 23:42
Transport: Streamable HTTP
URL

TDQS

A4.2/5.0

Scored 2026-09-02 08:35 across 15 tools

Disambiguation5/5

Each tool targets a distinct date/calendar operation: arithmetic, conversion, weekday lookup, period membership, moon phase, daylight, event queries, formatting/parsing, and two different rendering outputs. Even superficially similar tools (calendar_weekday vs nth_weekday_of_month, calendar_events vs calendar_periods) ask clearly different questions that the descriptions make unambiguous.

Naming Consistency4/5

Names are all lowercase snake_case and mostly follow a verb_first or noun_query pattern, but there is a mix: add_to_date, convert_date, and parse_calendar_date are imperative, while moon_phases, sun_daylight, and calendar_events are noun phrases describing what they return. The calendar_ prefix on three tools and consistent rendering parse/format pairs help readability, so this is a minor deviation, not chaos.

Tool Count5/5

15 tools sits at the upper bound of the ideal range for a focused domain toolkit. Every tool addresses a genuine calendar use case (define, convert, query, render, validate, generate), and none feels redundant or extraneous.

Completeness5/5

The set covers the full lifecycle of working with a custom calendar: validation before use, conversion between representations, date arithmetic and intervals, weekday and period queries, recurring events and daylight/moon data, formatting/parsing, and visual rendering. No obvious dead ends or missing operations come to mind for the stated domain.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

10 tool updatesSep 1, 2026

Changedadd_to_date9 fields changed

removedInput schema / properties / date / additionalProperties
```
Removed value: -true
```

addedInput schema / properties / date / anyOf

Added value: +[
+  {
+    "additionalProperties": true,
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

addedInput schema / properties / date / default
```
Added value: +null
```
removedInput schema / properties / date / type
```
Removed value: -"object"
```

addedInput schema / properties / on_error

Added value: +{
+  "default": "fail",
+  "title": "On Error",
+  "type": "string"
+}

addedInput schema / properties / steps

Added value: +{
+  "anyOf": [
+    {
+      "items": {
+        "additionalProperties": true,
+        "type": "object"
+      },
+      "type": "array"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Steps"
+}

addedInput schema / properties / ticks

Added value: +{
+  "default": 0,
+  "title": "Ticks",
+  "type": "integer"
+}

addedInput schema / properties / time

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": {
+        "type": "integer"
+      },
+      "type": "object"
+    },
+    {
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Time"
+}

changedInput schema / required

Previous value: -[
-  "calendar",
-  "date"
-]New value: +[
+  "calendar"
+]

Changedcalendar_events4 fields changed

changedInput schema / properties / event / anyOf

Previous value: -[
-  {
-    "type": "string"
-  },
-  {
-    "additionalProperties": true,
-    "type": "object"
-  }
-]New value: +[
+  {
+    "type": "string"
+  },
+  {
+    "additionalProperties": true,
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

addedInput schema / properties / event / default
```
Added value: +null
```

addedInput schema / properties / events

Added value: +{
+  "anyOf": [
+    {
+      "items": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "additionalProperties": true,
+            "type": "object"
+          }
+        ]
+      },
+      "type": "array"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Events"
+}

changedInput schema / required

Previous value: -[
-  "calendar",
-  "event"
-]New value: +[
+  "calendar"
+]

Addedcalendar_periods

Changedcalendar_weekday7 fields changed

removedInput schema / properties / date / additionalProperties
```
Removed value: -true
```

addedInput schema / properties / date / anyOf

Added value: +[
+  {
+    "additionalProperties": true,
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

addedInput schema / properties / date / default
```
Added value: +null
```
removedInput schema / properties / date / type
```
Removed value: -"object"
```

addedInput schema / properties / dates

Added value: +{
+  "anyOf": [
+    {
+      "items": {
+        "additionalProperties": true,
+        "type": "object"
+      },
+      "type": "array"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Dates"
+}

addedInput schema / properties / on_error

Added value: +{
+  "default": "fail",
+  "title": "On Error",
+  "type": "string"
+}

changedInput schema / required

Previous value: -[
-  "calendar",
-  "date"
-]New value: +[
+  "calendar"
+]

Changedconvert_date5 fields changed

addedInput schema / properties / dates

Added value: +{
+  "anyOf": [
+    {
+      "items": {
+        "additionalProperties": true,
+        "type": "object"
+      },
+      "type": "array"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Dates"
+}

addedInput schema / properties / day_numbers

Added value: +{
+  "anyOf": [
+    {
+      "items": {
+        "type": "integer"
+      },
+      "type": "array"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Day Numbers"
+}

addedInput schema / properties / gregorians

Added value: +{
+  "anyOf": [
+    {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Gregorians"
+}

addedInput schema / properties / on_error

Added value: +{
+  "default": "fail",
+  "title": "On Error",
+  "type": "string"
+}

addedInput schema / properties / time

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": {
+        "type": "integer"
+      },
+      "type": "object"
+    },
+    {
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Time"
+}

Changeddate_interval2 fields changed

addedInput schema / properties / end_time

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": {
+        "type": "integer"
+      },
+      "type": "object"
+    },
+    {
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "End Time"
+}

addedInput schema / properties / start_time

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": {
+        "type": "integer"
+      },
+      "type": "object"
+    },
+    {
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Start Time"
+}

Changedformat_calendar_date9 fields changed

removedInput schema / properties / date / additionalProperties
```
Removed value: -true
```

addedInput schema / properties / date / anyOf

Added value: +[
+  {
+    "additionalProperties": true,
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

addedInput schema / properties / date / default
```
Added value: +null
```
removedInput schema / properties / date / type
```
Removed value: -"object"
```

addedInput schema / properties / dates

Added value: +{
+  "anyOf": [
+    {
+      "items": {
+        "additionalProperties": true,
+        "type": "object"
+      },
+      "type": "array"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Dates"
+}

addedInput schema / properties / on_error

Added value: +{
+  "default": "fail",
+  "title": "On Error",
+  "type": "string"
+}

addedInput schema / properties / time

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": {
+        "type": "integer"
+      },
+      "type": "object"
+    },
+    {
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Time"
+}

addedInput schema / properties / times

Added value: +{
+  "anyOf": [
+    {
+      "items": {
+        "anyOf": [
+          {
+            "additionalProperties": {
+              "type": "integer"
+            },
+            "type": "object"
+          },
+          {
+            "type": "integer"
+          }
+        ]
+      },
+      "type": "array"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Times"
+}

changedInput schema / required

Previous value: -[
-  "calendar",
-  "date",
-  "pattern"
-]New value: +[
+  "calendar",
+  "pattern"
+]

Changedmoon_phases1 field changed

addedInput schema / properties / time

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": {
+        "type": "integer"
+      },
+      "type": "object"
+    },
+    {
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Time"
+}

Changedrender_calendar_page4 fields changed

addedInput schema / properties / month / anyOf

Added value: +[
+  {
+    "type": "integer"
+  },
+  {
+    "type": "null"
+  }
+]

addedInput schema / properties / month / default
```
Added value: +null
```
removedInput schema / properties / month / type
```
Removed value: -"integer"
```

changedInput schema / required

Previous value: -[
-  "calendar",
-  "year",
-  "month"
-]New value: +[
+  "calendar",
+  "year"
+]

Addedsun_daylight

13 tool updatesSep 1, 2026
- First observedadd_to_date
- First observedcalendar_events
- First observedcalendar_weekday
- First observedconvert_date
- First observeddate_interval
- First observedformat_calendar_date
- First observedmoon_phases
- First observednth_weekday_of_month
- First observedparse_calendar_date
- First observedrender_calendar_page
- First observedrender_timeline
- First observedscatter_dates
- First observedvalidate_calendar_spec

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