Asterwise

Nakshatra Prediction

asterwise_get_nakshatra_prediction

Read-only

Personal daily prediction from Tarabala and Chandrabala for the day at the birth place (sunrise to next sunrise).

WORKFLOW: BEFORE: None — birth data computes everything needed. AFTER: asterwise_get_panchanga — the day's full panchanga; asterwise_get_muhurta — Tarabala-aware windows for an activity.

INPUT CONTRACT: birth: BirthData (date, time, lat, lon, timezone). Unknown birth time: omit time; never pass '00:00'. target_date (optional, YYYY-MM-DD): defaults to today at the birth place.

DO NOT CONFUSE WITH: asterwise_get_nakshatra_details — static nakshatra reference, not a personal prediction. asterwise_get_panchanga — daily panchanga (tithi, yoga, karana), not Tarabala.

Full output and error contract: https://docs.asterwise.com/mcp/tools/get-nakshatra-prediction/

Input Schema

Name	Required	Description	Default
`birth`	Yes	Birth data for tools that need the exact birth time (no sunrise fallback).
`target_date`	No	Date of the prediction, YYYY-MM-DD. Defaults to today in the birth time zone.
`response_format`	No	Output format: 'markdown' (default) for a readable report, or 'json' for the raw structured payload.	markdown

Output Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 10, 2026

changedInput schema / properties / target_date / description

Previous value: -"Date in YYYY-MM-DD format. Defaults to today when omitted."New value: +"Date of the prediction, YYYY-MM-DD. Defaults to today in the birth time zone."

Changed1 schema field changedOct 6, 2026

changedInput schema / properties / birth / description

Previous value: -"Birth data for tools that need the exact birth time.\n\nTheir API endpoints have no sunrise fallback and reject a request without\na time, so the time is required here instead of failing upstream."New value: +"Birth data for tools that need the exact birth time (no sunrise fallback)."

Changed7 schema fields changedOct 6, 2026

changedInput schema / properties / birth / description

Previous value: -"Birth data for a single person."New value: +"Birth data for tools that need the exact birth time.\n\nTheir API endpoints have no sunrise fallback and reject a request without\na time, so the time is required here instead of failing upstream."

removedInput schema / properties / birth / properties / time / anyOf

Removed value: -[
-  {
-    "pattern": "^\\d{2}:\\d{2}$",
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

removedInput schema / properties / birth / properties / time / default
```
Removed value: -null
```

changedInput schema / properties / birth / properties / time / description

Previous value: -"Birth time HH:MM (24h), e.g. '06:45'. Omit if unknown (a sunrise chart is used and birth_time_provided=false); never pass '00:00' for unknown."New value: +"Birth time HH:MM (24h), e.g. '06:45'. Required: this tool has no sunrise fallback. If the user doesn't know it, say so rather than guessing; never pass '00:00' for unknown."

addedInput schema / properties / birth / properties / time / pattern
```
Added value: +"^\\d{2}:\\d{2}$"
```
addedInput schema / properties / birth / properties / time / type
```
Added value: +"string"
```

changedInput schema / properties / birth / required

Previous value: -[
-  "date",
-  "lat",
-  "lon"
-]New value: +[
+  "date",
+  "time",
+  "lat",
+  "lon"
+]

Changed2 schema fields changedSep 5, 2026

addedInput schema / properties / response_format / description

Added value: +"Output format: 'markdown' (default) for a readable report, or 'json' for the raw structured payload."

addedInput schema / properties / target_date / description

Added value: +"Date in YYYY-MM-DD format. Defaults to today when omitted."

Changed8 schema fields changedSep 4, 2026

changedInput schema / properties / birth / properties / date / description

Previous value: -"Birth date in YYYY-MM-DD format. Example: '1985-11-12'"New value: +"Birth date YYYY-MM-DD."

changedInput schema / properties / birth / properties / lat / description

Previous value: -"Birth latitude in decimal degrees. North positive, south negative. Example: 19.0760 for Mumbai, -33.8688 for Sydney"New value: +"Latitude in decimal degrees, north positive (Mumbai 19.076)."

changedInput schema / properties / birth / properties / lon / description

Previous value: -"Birth longitude in decimal degrees. East positive, west negative. Example: 72.8777 for Mumbai, -74.0060 for New York"New value: +"Longitude in decimal degrees, east positive (Mumbai 72.8777)."

changedInput schema / properties / birth / properties / person_name / description

Previous value: -"Name of the person for this chart. Example: 'Arjun Mehta'"New value: +"Person's name, used in labels only."

changedInput schema / properties / birth / properties / time / description

Previous value: -"Birth time in HH:MM 24-hour format. Example: '06:45'. Omit entirely if the birth time is unknown: a sunrise chart is used and birth_time_provided returns false. Do not pass '00:00' for an unknown time, it is treated as a real midnight birth and returns a confidently wrong ascendant."New value: +"Birth time HH:MM (24h), e.g. '06:45'. Omit if unknown (a sunrise chart is used and birth_time_provided=false); never pass '00:00' for unknown."

changedInput schema / properties / birth / properties / timezone / description

Previous value: -"IANA timezone for the birth location. Examples: 'Asia/Kolkata' (India), 'America/New_York' (New York), 'Europe/London' (London), 'Asia/Tokyo' (Japan), 'America/Los_Angeles' (Los Angeles), 'Europe/Paris' (Paris), 'Asia/Dubai' (Dubai), 'Asia/Singapore' (Singapore), 'America/Chicago' (Chicago), 'Australia/Sydney' (Sydney). Default: Asia/Kolkata"New value: +"IANA timezone of the birth place, e.g. 'Asia/Kolkata', 'America/New_York', 'Europe/London'. Default: Asia/Kolkata"

addedInput schema / properties / response_format / default
```
Added value: +"markdown"
```

changedInput schema / required

Previous value: -[
-  "birth",
-  "response_format"
-]New value: +[
+  "birth"
+]

Changed6 schema fields changedJul 25, 2026

addedInput schema / properties / birth / properties / time / anyOf

Added value: +[
+  {
+    "pattern": "^\\d{2}:\\d{2}$",
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

addedInput schema / properties / birth / properties / time / default
```
Added value: +null
```

changedInput schema / properties / birth / properties / time / description

Previous value: -"Birth time in HH:MM format (24-hour). Example: '06:45'. Use '00:00' if unknown."New value: +"Birth time in HH:MM 24-hour format. Example: '06:45'. Omit entirely if the birth time is unknown: a sunrise chart is used and birth_time_provided returns false. Do not pass '00:00' for an unknown time, it is treated as a real midnight birth and returns a confidently wrong ascendant."

removedInput schema / properties / birth / properties / time / pattern
```
Removed value: -"^\\d{2}:\\d{2}$"
```
removedInput schema / properties / birth / properties / time / type
```
Removed value: -"string"
```

changedInput schema / properties / birth / required

Previous value: -[
-  "date",
-  "time",
-  "lat",
-  "lon"
-]New value: +[
+  "date",
+  "lat",
+  "lon"
+]

AddedMay 2, 2026

TDQS

A4.5/5.0

Behavior4/5

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

Annotations already declare readOnly/openWorld=false/no-destructive, so the safety profile is covered; the description adds real behavioral context the annotations cannot: the tool needs an exact birth time, has no sunrise fallback, and handles unknown-time edge cases. It also names where the full output/error contract lives, which is useful given a rich output schema.

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?

Front-loads the one-line purpose, then uses labeled sections (WORKFLOW, INPUT CONTRACT, DO NOT CONFUSE WITH) so an agent can scan to the relevant block. Every sentence carries routing, input, or disambiguation value; nothing is filler.

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 3-parameter tool with a nested birth object, full schema coverage, rich annotations, and an output schema, the description supplies exactly the missing layer: when to use it, what to call before/after, how it differs from adjacent tools, and the required-input contract.

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%, so the baseline is 3, and the description mostly restates what the schema already says (target_date defaults to today at the birth place, birth = date/time/lat/lon/timezone). It does add one non-schema behavior note about unknown birth time, but that note ('omit time') sits awkwardly against the schema's required list for birth, so it adds ambiguity rather than clean extra meaning.

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?

States a precise verb+resource+scope: a personal daily prediction derived from Tarabala and Chandrabala, anchored to the birth place and the sunrise-to-sunrise day. The DO NOT CONFUSE WITH block explicitly separates it from asterwise_get_nakshatra_details (static reference) and asterwise_get_panchanga (daily panchanga), so an agent can route correctly without opening either schema.

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

Usage Guidelines5/5

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

Gives explicit BEFORE: None and AFTER: follow-ups (asterwise_get_panchanga, asterwise_get_muhurta) plus a named set of non-alternatives with the reason each is excluded. This is about as close to a routing decision table as a description gets.

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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