Almanack

render_calendar_page

Draw one month of a calendar as an SVG grid, or a whole year on one sheet, and return the SVG itself. Columns come from the calendar's own week, so a ten-day week gets ten columns. Intercalary days belong to no month and never take a cell in the grid: the blocks either side of this month are drawn as a strip outside it, dashed when the week does not count them. Moons get a glyph per day, lit to that moon's phase, when the calendar defines any. Events use the same shape as render_timeline and are filtered to the days on this page, with at most 500 given and at most three shown per day before the rest become a count. Colours are assigned per color_key from the whole list before filtering, so a category keeps its colour across months. OMIT 'month' TO DRAW THE WHOLE YEAR on one sheet, every month side by side — for seeing at once whether festivals are evenly spread, which nine separate month pages do not show. A year sheet has no room for labels or moon glyphs, so each day carries its number and a dot per event, every dot holding its label in a . Fully deterministic: the same arguments always produce byte-identical SVG. The output is static SVG and never contains script or style.

Input Schema

TableJSON Schema

Name	Required	Default
`year`	Yes
`month`	No
`theme`	No	default
`events`	No
`calendar`	Yes

Output Schema

TableJSON Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections. Dates show when Glama detected each change.

Changed4 schema fields changedSep 1, 2026

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"
+]

First observedSep 1, 2026

TDQS

A4.3/5.0

Behavior5/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure, and it does so thoroughly: SVG output, variable column counts from the calendar's week, intercalary-day strip treatment, dashed strips, moon phase glyphs, event filtering, 500-event and 3-per-day limits, and color assignment before filtering are all detailed. No annotation contradiction exists.

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

Conciseness4/5

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

The description is dense but mostly earns its length: the core purpose is front-loaded, followed by behavioral constraints and then the whole-year mode. Some repetition exists around the year-sheet option, and the single unbroken block makes it harder to scan, but every major behavioral rule has a place.

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?

Given the output schema exists, the description does not need to explain return values, and it already covers many edge cases (intercalary days, week lengths, moons, event limits, color stability). The main gap is the undocumented 'theme' parameter and possibly the once unknown fifth parameter, which prevents a 5 for full contextual completeness.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must compensate. It adds strong meaning for 'month' (omit to draw year), 'events' (filtering, limits, color behavior), and 'calendar' (week structure, intercalary days, moons). However, 'theme' is never mentioned or tied to the described color behavior, and there is a fifth parameter not covered by any described semantics.

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 opens with a specific verb and resource: 'Draw one month of a calendar as an SVG grid, or a whole year on one sheet, and return the SVG itself.' This clearly distinguishes the tool from siblings like render_timeline and calendar_periods, and the month-or-year modal behavior is unique and explicit.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

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

The description gives clear usage context: it explains when to choose the whole-year mode ('for seeing at once whether festivals are evenly spread') and contrasts it with 'nine separate month pages do not show.' It also references render_timeline for event shape, though it does not fully spell out when to prefer one sibling over another.

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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TDQS

A4.2/5.0

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.

Resources

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