Asterwise

Ghat Chakra

asterwise_get_ghat_chakra

Read-onlyIdempotent

Returns the four Ghatak (inauspicious) timing parameters for a native based on their Janma Rasi (natal Moon sign).

WORKFLOW: BEFORE: None — birth data computes everything needed. AFTER: asterwise_get_nakshatra_prediction — for today's personalized daily auspiciousness score.

INPUT CONTRACT: birth — BirthData (date, time, lat, lon, timezone). Moon sign is computed from birth data.

DO NOT CONFUSE WITH: asterwise_get_nakshatra_prediction — personalised daily Tarabala score, not static Ghatak parameters. asterwise_get_panchanga — daily panchanga elements, not Ghat Chakra lookup.

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

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "birth": "<birth>"
    },
    "name": "asterwise_get_ghat_chakra"
  }
}

Input Schema

Name	Required	Description	Default
`birth`	Yes	Birth data for tools that need the exact birth time (no sunrise fallback).
`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 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"
+]

Changed1 schema field 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."

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 cover the safety profile (readOnly, idempotent, non-destructive, closed-world). The description adds real value beyond that: it declares that all inputs derive from birth data with no sunrise fallback and states the computational dependency on the natal Moon sign. It stops short of richer behavioral detail (cost, latency, precision limits) but covers what matters for correct invocation.

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-loaded one-line purpose followed by labeled blocks (WORKFLOW, INPUT CONTRACT, DO NOT CONFUSE WITH). Every sentence carries routing or input information; nothing is padding, despite 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?

An output schema exists so return values need no prose, and the description supplies the missing pieces: workflow placement, the input contract, disambiguation from siblings, and a docs link for the full output/error contract. Nothing needed to call it correctly is absent.

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 schema already documents birth, response_format and every nested field (including the ayanamsa enum and the warning against guessing birth time). The description only adds that Moon sign is computed from birth data, which is derived behavior rather than new parameter meaning. Baseline 3 applies.

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: returns the four Ghatak (inauspicious) timing parameters, scoped to Janma Rasi. It explicitly names and contrasts the sibling tools it could be confused with, so an agent can select it 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?

The WORKFLOW block gives explicit BEFORE/AFTER sequencing, and the DO NOT CONFUSE WITH block names two alternatives (get_nakshatra_prediction, get_panchanga) with the exact distinguishing condition for each. Nothing about when to use this vs. those is left to inference.

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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