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Vimshottari Dasha

asterwise_get_dasha
Read-onlyIdempotent

Computes Vimshottari Dasha from birth data and returns hierarchical period trees plus current Maha/Antar interpretation blocks.

WORKFLOW: BEFORE: RECOMMENDED — asterwise_get_natal_chart — establishes chart and Moon context before interpreting Dasha lords. AFTER: asterwise_get_dasha_transits — correlates active Dasha lords with transits for the same birth data.

INPUT CONTRACT: levels (int, default 2, max 5): tree depth — 1 = Mahadasha only; 2 adds Antardasha; 3 Pratyantar; 4 Sookshma; 5 Prana (much larger payload). from_date / to_date (string, optional — YYYY-MM-DD, UTC, inclusive): return only the periods running in that range, at every level; use them with levels 4-5 to keep the answer small (one year of 5 levels is about 100 KB instead of over 20 MB). data.interpretation still describes today's periods. Response dates in periods[] use DD/MM/YYYY, not ISO. BirthData fields follow the global contract (date YYYY-MM-DD, time HH:MM). Unknown birth time: omit time (a sunrise chart is cast and birth_time_provided=false); never pass time='00:00' for unknown, which is read as midnight.

DO NOT CONFUSE WITH: asterwise_get_char_dasha — classical sign-based periods with ISO dates on periods[], not planet-based Vimshottari. asterwise_get_yogini_dasha — 36-year eight-Yogini cycle with data.periods.root[], not Vimshottari. asterwise_get_ashtottari_dasha — 108-year alternative tree with data.periods.root[] and same levels semantics as this tool.

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

Input Schema

NameRequiredDescriptionDefault
birthYesBirth data for a single person.
levelsNoDepth of the Vimshottari tree, 1-5: 1 = Mahadasha only, 2 adds Antardasha (default), 3 Pratyantar, 4 Sookshma, 5 Prana (much larger payload).
to_dateNoYYYY-MM-DD (UTC, inclusive). Only periods that have started by the end of this day.
from_dateNoYYYY-MM-DD (UTC). Only periods still running on or after this day.
response_formatNoOutput format: 'markdown' (default) for a readable report, or 'json' for the raw structured payload.markdown

Output Schema

NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changed
    • addedInput schema / properties / from_date
      Added value: +{
+  "anyOf": [
+    {
+      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "YYYY-MM-DD (UTC). Only periods still running on or after this day."
+}
    • addedInput schema / properties / to_date
      Added value: +{
+  "anyOf": [
+    {
+      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "YYYY-MM-DD (UTC, inclusive). Only periods that have started by the end of this day."
+}
  2. Changed2 schema fields changed
    • addedInput schema / properties / levels / description
      Added value: +"Depth of the Vimshottari tree, 1-5: 1 = Mahadasha only, 2 adds Antardasha (default), 3 Pratyantar, 4 Sookshma, 5 Prana (much larger payload)."
    • addedInput schema / properties / response_format / description
      Added value: +"Output format: 'markdown' (default) for a readable report, or 'json' for the raw structured payload."
  3. Changed9 schema fields changed
    • 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"
    • changedInput schema / properties / levels / default
      Previous value: -3New value: +2
    • addedInput schema / properties / response_format / default
      Added value: +"markdown"
    • changedInput schema / required
      Previous value: -[
-  "birth",
-  "response_format"
-]New value: +[
+  "birth"
+]
  4. Changed6 schema fields changed
    • 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"
+]
  5. First observed

TDQS

A4.6/5.0
Behavior4/5

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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), yet the description still adds real operational context: payload magnitudes (about 100 KB vs over 20 MB), the fact that data.interpretation ignores from_date/to_date, and the unknowable-birth-time fallback (sunrise chart, birth_time_provided=false, never pass 00:00). The one gap is that it defers the full error contract to an external URL rather than summarizing it inline.

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?

Front-loaded one-sentence summary followed by labeled blocks (WORKFLOW, INPUT CONTRACT, DO NOT CONFUSE), which makes scanning easy. The levels explanation largely restates the schema enum, a minor redundancy, but the density of the remaining content justifies the length.

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 nested-input, output-schema-bearing computation tool, it covers everything an agent needs: birth data contract, unknown-time edge case, depth/payload tradeoff, date filtering semantics, output date format quirk, and correct sibling routing. Return values need not be documented further because an output schema exists.

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

Parameters4/5

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

Schema coverage is 100%, so baseline would be 3; the description earns a point by adding meaning the schema lacks — the per-level names (Maha/Antar/Pratyantar/Sookshma/Prana), the DD/MM/YYYY date format inside periods[] versus ISO elsewhere, and the explicit recommendation to pair date filters with levels 4-5 to bound payload size. It also clarifies the semantic asymmetry of the date filters (periods that started by to_date vs still running after from_date).

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 specific verb and resource ("Computes Vimshottari Dasha from birth data") plus the exact return shape (hierarchical period trees and current Maha/Antar interpretation blocks). The DO NOT CONFUSE section names the three closest siblings (char, yogini, ashtottari dasha) and the discriminator for each, so the agent can select this tool without opening any 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 workflow sequencing (RECOMMENDED prerequisite asterwise_get_natal_chart, follow-on asterwise_get_dasha_transits) with the reason for each. Exclusions are spelled out by naming rival dasha tools and their distinguishing payload fields rather than leaving the agent to infer.

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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