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caelus-mcp

by io.github.heavyblotto
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transits

Transiting planets vs natal chart: aspects within orb (applying/separating), natal house per transiting body.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
latYesLatitude, north positive
lonYesLongitude, EAST positive (Americas are negative)
orbNoMax orb in degrees
dateYesUTC date-time, ISO 8601, e.g. 1990-06-10T14:30:00Z. Convert local birth time to UTC first.
zodiacNotropical (default) or sidereal:<ayanamsa>tropical
house_systemNoHouse system (default placidus). Case- and spacing-insensitive; valid: placidus, whole_sign, equal, porphyry, koch, regiomontanus, campanus, alcabitius, morinus, meridian, polich_page, vehlow (aliases like "whole sign" also work).placidus
transit_dateNoUTC ISO date-time of transit moment (convert from local first); omit for now

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changed
    • addedInput schema / properties / house_system / description
      Added value: +"House system (default placidus). Case- and spacing-insensitive; valid: placidus, whole_sign, equal, porphyry, koch, regiomontanus, campanus, alcabitius, morinus, meridian, polich_page, vehlow (aliases like \"whole sign\" also work)."
    • removedInput schema / properties / house_system / enum
      Removed value: -[
-  "placidus",
-  "whole_sign",
-  "equal",
-  "porphyry",
-  "koch",
-  "regiomontanus",
-  "campanus",
-  "alcabitius",
-  "morinus",
-  "meridian",
-  "polich_page",
-  "vehlow"
-]
  2. First observed

TDQS

B3.1/5.0
Behavior2/5

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

Without annotations, the description should reveal behavioral traits. It mentions orb usage and aspect status (applying/separating), but omits details like default return format, ordering, limits, or that it is a read‑only operation. The description lacks sufficient behavioral depth.

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 a single, dense sentence that front‑loads the tool's purpose. It is concise with no filler, though it could be slightly restructured for readability.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the astrological complexity and the lack of an output schema, the description is too sparse. It fails to explain fundamental concepts (aspect types, orb default, output structure) or how to interpret results, leaving significant gaps for an AI agent.

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 coverage is 100% and descriptions exist for every parameter. The tool description does not add meaning beyond the schema, so a baseline score of 3 is appropriate.

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 clearly states the tool computes aspects between transiting planets and the natal chart, including whether aspects are applying or separating, and which natal house the transiting body falls in. This distinguishes it from siblings like 'current_sky' (no natal comparison) and 'natal_chart' (no transit component).

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

Usage Guidelines2/5

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

No explicit guidance on when to use this tool versus alternatives such as 'returns', 'progressions', or 'cosmic_weather'. The description implies use for transit analysis but does not set contextual boundaries or recommend alternatives.

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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