AstroWay Vedic astrology

Varga D3: Drekkana

astroway_vedic_varga_d3

Read-onlyIdempotent

Drekkana chart (siblings, courage; trinal third-of-sign division).

[Group: Vedic] [Endpoint: POST /v1/vedic/varga/D3] [Required: date, time, latitude, longitude] [Cost: 20 credits (Tier 2)]

Input Schema

Name	Required	Description	Default
`city`	No
`date`	Yes
`name`	No
`time`	Yes
`fields`	No	Compact mode: comma-separated dotted paths to keep, relative to `data`, e.g. "planets.name,planets.longitude,houses.cusp". Omit for the whole response.
`ayanamsa`	No	Sidereal school by name. Lahiri when omitted. Equivalent to ayanamsaId; send either.
`latitude`	Yes
`timezone`	No	IANA zone name such as Europe/Kyiv, or auto to look the zone up from latitude and longitude. The server takes the offset that zone kept at this local date and time, summer time included, and uses it in place of timezoneOffset. A clock time that happened twice takes the first occurrence; one skipped when clocks went forward takes the offset from before the change. Abbreviations such as EST are refused. Before 1970 the tz database is not reliable for every place, so send timezoneOffset when the local clock is known.
`cosmogram`	No
`longitude`	Yes
`precision`	No	Compact mode: round fractional numbers to this many decimals. Longitudes carry 14 by default; 2 is finer than any chart is drawn.
`ayanamsaId`	No
`zodiacType`	No
`houseSystem`	No		P
`timezoneOffset`	No	Hours from UTC at the given moment, not minutes. Fractional zones are hours too: 5.5 for India, 5.75 for Nepal, -3.5 for Newfoundland. Defaults to 0, meaning UTC. Ignored when timezone is sent.

Output Schema

Name	Required	Description	Default
`name`	No
`lagna`	No
`varga`	No
`planets`	No
`ayanamsa`	No
`julianDay`	No

Schema Changelog

Changes observed during successful MCP inspections.

First observedOct 5, 2026

TDQS

B3/5.0

Behavior3/5

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

Annotations already declare readOnlyHint, idempotentHint, non-destructive, and closed-world behavior, so the safety profile is covered. The description adds cost (20 credits, Tier 2) and required inputs, but does not disclose authentication needs, rate limits, or other behavioral details beyond what annotations and the output schema already provide.

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 front-loaded with the chart's domain meaning and then gives terse, useful metadata. It contains no filler, though the bracketed metadata style is formulaic rather than richly structured.

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

Completeness3/5

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

For a 15-parameter calculation tool with an output schema, the description covers the required inputs, cost, group, and endpoint. However, it omits any mention of important optional parameters and defaults that affect the chart calculation, leaving a significant gap given the low schema description coverage.

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

Parameters2/5

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

Schema description coverage is only 33% for 15 parameters. The description lists the four required fields (date, time, latitude, longitude), which are already marked required in the schema, and adds no meaning for optional parameters such as ayanamsa, houseSystem, timezone, fields, or precision. With low coverage, the description should compensate but does not.

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?

Names the specific Vedic chart ('Drekkana chart') and describes its domain meaning ('siblings, courage; trinal third-of-sign division'). This distinguishes it from general astrology tools, though it does not explicitly compare it to sibling varga tools like D9 or D10.

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 guidance is given about when to use this D3 chart versus other varga charts or alternative tools. The metadata only states group, endpoint, required parameters, and cost, leaving usage selection entirely to the agent's inference.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

All AstroWay Vedic astrology tools Inspect

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