Asterwise

Crystal Lookup

asterwise_get_crystal

Read-onlyIdempotent

Lookup a specific crystal by slug or name (case-insensitive). Returns full detail including dual Vedic/Western planetary assignments, all healing properties, and any safety cautions.

WORKFLOW: BEFORE: None — standalone or after asterwise_get_gemstone_recommendations. AFTER: None.

INPUT CONTRACT: name: Crystal slug or display name. Examples: 'amethyst', 'blue-sapphire', 'Cat's Eye Chrysoberyl'

DO NOT CONFUSE WITH: asterwise_get_crystals — full 50-crystal catalogue. asterwise_get_crystal_by_planet — all crystals for a Vedic planet. asterwise_get_gemstone_recommendations — natal chart-based gem recommendations (house lordship rules), different from this database.

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

Input Schema

TableJSON Schema

Name	Required	Description	Default
`name`	Yes	Person's full name as commonly written; letters are converted to numerology values.
`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. Dates show when Glama detected each change.

Changed2 schema fields changedSep 5, 2026

addedInput schema / properties / name / description

Added value: +"Person's full name as commonly written; letters are converted to numerology values."

addedInput schema / properties / response_format / description

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

Changed2 schema fields changedSep 4, 2026
- addedInput schema / properties / response_format / default
```
Added value: +"markdown"
```
- changedInput schema / required
```
Previous value: -[
-  "name",
-  "response_format"
-]New value: +[
+  "name"
+]
```
AddedMay 3, 2026

TDQS

A4.7/5.0

Behavior4/5

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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, so the safety profile is covered. The description adds useful behavioral detail: case-insensitive matching, full detail including cautions, and a link to the output/error contract. It doesn't discuss invalid inputs or edge cases, but this is adequate for a read-only lookup with an 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?

The description is organized with clear section headers and front-loaded with the core purpose. Each section — workflow, input contract, disambiguation, documentation link — earns its place without unnecessary 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?

Given the tool's simple two-parameter interface and output schema, the description is complete: it covers prerequisites, input semantics, examples, sibling-tool differentiation, and points to the full contract. Nothing essential is missing for correct invocation.

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?

The schema's description for 'name' is mismatched (numerology-related text), but the description's INPUT CONTRACT corrects this by specifying 'Crystal slug or display name' and giving concrete examples. It also adds case-insensitivity. The response_format parameter is already well described in the schema, so the description doesn't need to repeat it.

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 opens with a specific verb and resource: 'Lookup a specific crystal by slug or name.' It clearly states what is returned (Vedic/Western planetary assignments, healing properties, safety cautions) and includes a DO NOT CONFUSE section that directly separates it from sibling tools.

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?

WORKFLOW explicitly states that no prerequisite is needed and that it can be used standalone or after asterwise_get_gemstone_recommendations. The DO NOT CONFUSE section names three alternatives and explains when each is appropriate, giving an agent unambiguous routing guidance.

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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TDQS

A3.9/5.0

Disambiguation3/5

Many tools are well-differentiated by explicit 'DO NOT CONFUSE WITH' notes, but the sheer number of near-neighbor pairs (e.g., crystal vs gemstone recommendations, natal chart variants, dasha systems, compatibility systems, tarot draw variants) creates real selection risk. The descriptions mitigate overlap, but an agent browsing 103 tools will struggle to pick the right one.

Naming Consistency5/5

Every tool follows the asterwise_get_* or asterwise_draw_* prefix convention with a clear noun phrase (e.g., asterwise_get_natal_chart, asterwise_draw_tarot_cards). The two verbs 'get' and 'draw' are semantically appropriate, and there are no camelCase or mixed-style names.

Tool Count1/5

103 tools is far beyond a manageable MCP surface. While the domain is broad (Vedic astrology, Western astrology, numerology, tarot, crystals, dream symbols), the server bundles multiple distinct domains into one namespace, making it nearly impossible for an agent to discover the right tool efficiently.

Completeness4/5

The surface is impressively comprehensive across astrology, numerology, tarot, and remedies, with deep coverage of dasha systems, compatibility frameworks, and chart types. Minor gaps exist (e.g., no tarot interpretation endpoint, no batch operations, no update/delete since it's read-only data), but for a reference/prediction API the coverage is strong.

Resources

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