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caelus-mcp

by io.github.heavyblotto

void_of_course

Void-of-course Moon at a moment: whether the Moon makes no further Ptolemaic aspect to a traditional planet (Sun..Saturn) before it leaves its current sign. Returns the Moon's sign, the UTC time it exits that sign, and the UTC time of its next perfecting aspect (null when none remains -- i.e. void). Tropical by default.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
dateNoUTC ISO date-time (convert from local first); omit for now
zodiacNotropical (default) or sidereal:<ayanamsa>tropical

TDQS

A4.1/5.0
Behavior4/5

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

With no annotations, the description carries full burden. It discloses that the tool checks for no further Ptolemaic aspects to traditional planets, returns Moon's sign, exit time, and next aspect time (null when void). This is good behavioral detail.

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

Conciseness5/5

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

Two sentences, front-loaded with purpose, no wasted words. Clearly structured.

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

Completeness5/5

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

For a two-parameter tool with full schema coverage, the description sufficiently explains return values and behavior. No output schema is present, but description compensates adequately.

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 the description does not need to add much. It confirms defaults and provides context for the 'date' parameter (omit for now), but does not significantly extend beyond schema descriptions.

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's purpose: determining void-of-course Moon at a moment, with specific explanation of the condition and return values. It distinguishes itself from sibling astrological tools by its focused functionality.

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 for checking void-of-course Moon but does not provide explicit guidance on when to use versus alternatives, nor does it mention exclusions or prerequisites.

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

A3.9/5.0
Disambiguation5/5

Each tool has a highly specific and well-described purpose. Despite the large number, their functions are clearly distinct—e.g., natal_chart vs current_sky vs composite, or dasha vs firdaria vs profections vs releasing. The detailed descriptions prevent ambiguity.

Naming Consistency3/5

Names are consistently in snake_case but vary in style: some are noun phrases (natal_chart, cosmic_weather), some are verb-like (releasing, returns), and some are descriptive (aspect_patterns, find_aspect_dates). There is no strict verb_noun pattern, leading to moderate consistency.

Tool Count4/5

34 tools is high but appropriate for a comprehensive astrology API covering natal, transits, progressions, returns, synastry, time-lord techniques, sky events, and synthetic bodies. Each tool serves a specific niche, so the count feels justified rather than excessive.

Completeness5/5

The tool surface is extremely thorough, covering all major areas of astrology: chart generation, aspects, configurations, dignities, time-lord techniques (multiple systems), synastry, composite, progressions, returns, transits, sky events, rectification, electional, and synthetic bodies. No obvious gaps for the intended domain.

Resources