Asterwise

Natal Crystal Recommendations

asterwise_get_crystal_recommendations_natal

Read-onlyIdempotent

Recommends crystals from a Vedic natal chart using house lordship rules for gem selection. This is the only API that derives crystal recommendations from a computed natal chart — not from zodiac sign or chakra preference.

WORKFLOW: BEFORE: None — this tool internally computes the natal chart. No separate natal chart call required. AFTER: asterwise_get_crystal — get full detail (hardness, origins, affirmation, full caution text) on any recommended crystal by slug. AFTER: asterwise_get_remedies — broader classical remedial programme alongside gem recommendations.

INPUT CONTRACT: Standard BirthData (date, time, lat, lon, timezone, ayanamsa). Defaults to Lahiri ayanamsa. time (required): Ascendant (Lagna) is time-sensitive. Inaccurate birth time changes the Lagna → changes all house lords → changes recommendations entirely.

DO NOT CONFUSE WITH: asterwise_get_gemstone_recommendations — also a chart-based gem endpoint but uses a different engine (Atmakaraka + role-based prescription vs house lordship scoring); returns gem names not crystal database entries; does not include match_score or match_reasons. asterwise_get_crystal_recommendations — recommends crystals by zodiac sign, chakra, or intention keyword (no natal chart computation; Western metaphysical matching, not classical Jyotish). asterwise_get_crystal_by_planet — lists all crystals for a Vedic planet without house context — use this for reference, not prescription.

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

Input Schema

TableJSON Schema

Name	Required	Description	Default
`birth`	Yes	Birth data for a single person.
`response_format`	No	Output format: 'markdown' (default) for a readable report, or 'json' for the raw structured payload.	markdown

Output Schema

TableJSON Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

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 3, 2026

TDQS

A4.8/5.0

Behavior4/5

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

The annotations already indicate read-only, idempotent, non-destructive behavior. The description adds useful runtime behavior, such as the sunrise-chart fallback when time is omitted and the 'never pass 00:00' warning. It does not discuss rate limits or auth, but the annotations cover the core behavioral traits.

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?

The description is well-structured with clear headings and each section serves a distinct purpose: purpose, workflow, input contract, and disambiguation. Despite being detailed, it avoids redundant prose and stays focused on actionable guidance.

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?

The description provides enough context for an agent to decide when to use this tool, what inputs to provide, what defaults apply, and how it differs from closely related crystal and gemstone tools. It also includes a link to the full output/error contract and implies key output fields like match_score and match_reasons.

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

Parameters5/5

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

All schema parameters are described, including nested birth fields like lat/lon with ranges, time with format and special unknown-value semantics, ayanamsa enum meanings, timezone default, and response_format. The description adds practical examples and clarifies edge cases.

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 states a specific action: recommends crystals from a Vedic natal chart using house lordship rules. It also explicitly distinguishes this from zodiac/chakra-based matching, making the tool's purpose unambiguous.

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 description provides a clear workflow with BEFORE/AFTER steps, input contract details, defaults, and a dedicated 'DO NOT CONFUSE WITH' section that differentiates it from several sibling tools. It also links to the full output and error contract.

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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