Almanack

Server Details

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

The last two health checks of this connector failed. If this server requires authentication, missing or expired test credentials may be the cause. A test profile lets Glama authenticate for health checks and discover tools; it is separate from your personal connections.

If you are the author, claim ownership, then add or update a test profile under Admin → Test Profile.

Status: Unhealthy
Uptime: 0.0% over the last 24 hours
Last Tested: 2026-11-09 07:09
Transport: Streamable HTTP
URL
ChatGPT: –
Claude: –

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

Related MCP Connectors

GEOMETRYA
app.geometry
Deterministic calendars and cosmic date JSON for AI agents via MCP (Gregorian 1900-2100).
Calendar Management
81
https://mcp.geometry.app/mcp
tilwhen date engineA
com.tilwhen
Deterministic date arithmetic with auditable receipts: business days, due dates, holidays.
Calendar Management Project Management
92
https://mcp.tilwhen.com/mcp
Business Days & SLAB
io.github.Vessark
Business-day, SLA, cron and recurrence calculations — offline, holiday-aware, no network.
Project Management Developer Tools
1
https://vessark.com/mcp
chrono-mcpA
io.github.nexus-api-lab
Deterministic time tools for AI agents: timezone conversion, business-day math, cron interpretation.
Developer Tools Calendar Management
2
https://chrono-mcp.dokasukadon.workers.dev/mcp

Related MCP Servers

GEOMETRY MCP
Calendar Management Art & Culture
goqolabs
A
license
Not graded
quality
B
maintenance
Provides deterministic, byte-stable temporal reference data over MCP, resolving civil dates and names into calendars, seasons, moon phases, planetary retrogrades, and traditional symbolic systems. Exposes tools that return a single date's identity, compare two dates across shared symbolic systems, and map a name to cosmic cards and Latin cipher sums, with coverage focused on 1900–2100.
Updated a month ago (2026-10-01 23:58 UTC)
MIT
Date Math – Business Days,
Calendar Management Developer Tools Workplace & Productivity
JowenDelaPena
A
license
A
quality
B
maintenance
Exact date and time math for AI agents: business days with public holidays for 207 countries, DST-aware time-zone conversion, meeting-time overlap, cron schedules, RRULE expansion, SLA deadlines, payroll dates and natural-language date parsing. 13 tools. 25 free calls per day, then $0.001 per call via x402 (USDC on Base). No signup or API key.
Updated a day ago (2026-11-08 05:07 UTC)
10
21
MIT
cosine-astro-mcp
ganguoguo444004-coder
A
license
A
quality
C
maintenance
Enables users and language models to compute Western tropical astrology data offline, including natal charts, transits, synastry, Mercury retrograde periods, annual profections, and moon phases, with deterministic structured output.
Updated 23 days ago (2026-10-17 12:24 UTC)
6
53 npm
MIT
US Federal Holidays and
Calendar Management Finance
theluckystrike
A
license
A
quality
C
maintenance
Provides exact calendar calculations from 1971 to 2100, including OPM and Federal Reserve holiday observance, business-day addition and counting, and invoice due dates with weekend and holiday roll rules.
Updated 7 days ago (2026-11-02 05:17 UTC)
5
307 npm
MIT