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Western Astrology MCP Server by RoxyAPI

by com.roxyapi

Calculate house cusps - House system calculator with comparison

post_astrology_houses
Read-only

Calculate astrological house cusps using Placidus, Whole Sign, Equal, or Koch house systems. Returns all 12 house cusps with zodiac signs, degrees, Ascendant, and Midheaven. Use "all" parameter to compare all 4 house systems side-by-side. Perfect for astrology charts, house cusp tables, and educational tools showing house system differences. Includes accurate Ascendant and MC calculations.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
dateYesBirth date in YYYY-MM-DD format. Date is critical for house cusp calculations as it determines planetary positions used in some house systems.
langNoResponse 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
timeYesBirth time in 24-hour HH:MM:SS format. Time is ESSENTIAL for accurate house cusps, and even minutes matter. The Ascendant (1st house cusp) changes roughly every 4 minutes. Without accurate time, house placements will be incorrect.
compactNoSet 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.
latitudeYesBirth location latitude in decimal degrees (-90 to 90). Location determines the local horizon and meridian, which are fundamental to house division. Higher latitudes cause more distortion in time-based systems like Placidus.
timezoneYesDecimal hours from UTC (e.g. -5 for EST, 5.5 for IST, 9 for JST) OR IANA name (e.g. "America/New_York"). IANA resolved to the DST-correct offset for the chart date.
longitudeYesBirth location longitude in decimal degrees (-180 to 180). Affects local time and horizon calculations for house cusps.
houseSystemNoHouse system for dividing ecliptic into 12 houses. Placidus (most popular) uses time, Whole Sign (ancient) uses signs, Equal divides from Ascendant. Use "all" to compare all 4 systems side-by-side for educational purposes.placidus

Schema Changelog

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

  1. Changed1 schema field changed
    • changedInput schema / properties / time / description
      Previous value: -"Birth time in 24-hour HH:MM:SS format. Time is ESSENTIAL for accurate house cusps - even minutes matter. The Ascendant (1st house cusp) changes roughly every 4 minutes. Without accurate time, house placements will be incorrect."New value: +"Birth time in 24-hour HH:MM:SS format. Time is ESSENTIAL for accurate house cusps, and even minutes matter. The Ascendant (1st house cusp) changes roughly every 4 minutes. Without accurate time, house placements will be incorrect."
  2. Changed2 schema fields changed
    • 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"
+]
  3. Changed2 schema fields changed
    • addedInput schema / examples
      Added value: +[
+  {
+    "date": "1990-07-15",
+    "latitude": 40.7128,
+    "longitude": -74.006,
+    "time": "14:30:00",
+    "timezone": -5
+  }
+]
    • 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."
  4. Changed1 schema field changed
    • 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."
  5. Changed1 schema field changed
    • 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"
+}
  6. Changed1 schema field changed
    • 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"
+  }
+]
  7. First observed

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, so the safety profile is established. The description adds value by stating the return shape (12 cusps, signs, degrees, Ascendant, MC) and the 'all' comparison mode, which goes beyond structured annotations. It does not, however, disclose potential failure modes or precision caveats in the description itself, keeping it in line with the baseline for annotation-backed tools.

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 four sentences, with the core behavior and return values stated upfront. The 'Perfect for...' sentence is somewhat promotional but does convey target use cases. Overall it is compact, well-organized, and front-loaded, with no redundant restatement of the tool name.

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 8 parameters, high schema coverage, and no output schema, the description compensates by clearly describing the output: all 12 house cusps, signs, degrees, Ascendant, and Midheaven. It also explains the 'all' comparison mode, which is a key behavior. With annotations covering safety, an agent has enough context to invoke the tool correctly, though a note on error behavior would round it out.

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 100%, so all parameters are already individually documented. The description reinforces the meaning of the 'all' parameter ('compare all 4 house systems side-by-side for educational purposes'), but this is also covered in the houseSystem parameter description. The description adds little beyond the schema, so the baseline of 3 is appropriate.

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

Purpose4/5

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

The description gives a clear verb and resource: 'Calculate astrological house cusps' using specific systems, and lists the returned data (12 house cusps, Ascendant, Midheaven). This makes the tool's function unambiguous. However, it does not explicitly differentiate itself from overlapping siblings like post_astrology_natal_chart, so it stops short of full sibling distinction.

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?

The description implies usage through 'Perfect for astrology charts, house cusp tables, and educational tools showing house system differences,' which gives a sense of context. But it never states when NOT to use this tool or names alternatives (e.g., 'for a full chart use post_astrology_natal_chart'). Usage guidance remains implicit rather than explicit.

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

A3.8/5.0
Disambiguation3/5

Most tools are scoped to a clearly distinct domain—moon phases, houses, returns, fixed stars, astrocartography—but several pairs overlap, notably synastry vs. compatibility_score and transits vs. transit_aspects. The descriptions are long and do help an agent choose, but the boundaries are not always obvious at the name level.

Naming Consistency4/5

Every tool follows the same snake_case get_astrology_/post_astrology_ prefix pattern, making the group predictable and readable. However, collection endpoints like get_astrology_planet_meanings_id and get_astrology_signs_id awkwardly combine plural collection and singular id naming, and names like calendar_year_month depart from the cleaner resource+suffix pattern.

Tool Count2/5

With 38 tools, this is well over the 25+ threshold and feels heavy for an agent to traverse. While Western astrology is a broad domain, several near-duplicate endpoints, especially synastry/compatibility and transits/transit_aspects, could be consolidated into fewer, more scoped tools.

Completeness5/5

The toolset is comprehensive, covering natal charts, relationships, transits, returns, progressions, aspects, houses, relocation, and reference data. It includes enough specialized endpoints for both casual horoscope use and in-depth astrological analysis, with no obvious dead ends for the stated domain.

Resources