AstroWay Tarot

Marseille: Three-Card

astroway_tarot_marseille_draw_three_card

Read-onlyIdempotent

Past / Present / Future three-card spread.

[Group: Tarot: Marseille] [Endpoint: POST /v1/tarot/marseille/draw/three-card] [Cost: 10 credits (Tier 1)]

Input Schema

Name	Required	Description
`art`	No	Card art set, e.g. rws-1909, rws-restored, rws-vector. GET /v1/tarot/decks lists the sets per deck.
`seed`	No
`fields`	No	Compact mode: comma-separated dotted paths to keep, relative to `data`, e.g. "planets.name,planets.longitude,houses.cusp". Omit for the whole response.
`question`	No
`precision`	No	Compact mode: round fractional numbers to this many decimals. Longitudes carry 14 by default; 2 is finer than any chart is drawn.
`allowReversed`	No

Output Schema

Name	Required	Description	Default
`seed`	No
`drawn`	No
`spread`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 6, 2026

addedInput schema / properties / art

Added value: +{
+  "description": "Card art set, e.g. rws-1909, rws-restored, rws-vector. GET /v1/tarot/decks lists the sets per deck.",
+  "maxLength": 40,
+  "type": "string"
+}

First observedOct 5, 2026

TDQS

B3/5.0

Behavior3/5

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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and closed-world scope, so the safety profile is fully covered. The description usefully adds the cost (10 credits, Tier 1) and HTTP endpoint, which are real context beyond the structured fields, but adds nothing about seeding behavior, reversals, or determinism.

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-line spread definition followed by compact metadata taglines; nothing is padded. The bracket tags are dense but functional rather than redundant prose.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

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 not be explained, and annotations cover safety. But the description leaves two of six parameters completely undefined and gives no usage context, which is thin for a 6-param, no-required-field tool.

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

Parameters2/5

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

Schema description coverage is only 50%; seed, question, and allowReversed are undocumented in the schema, and the description contributes no parameter semantics at all. With 6 parameters and no required ones, the description should at least clarify what question and allowReversed do, but it does not.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States the specific spread and its positional meaning (Past/Present/Future) for a tarot draw. The group tag and name identify the Marseille deck, though the description body itself never restates 'Marseille' or the draw verb, leaving cross-deck distinction to the tool name.

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

Usage Guidelines2/5

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

No when-to-use, when-not-to-use, or alternative routing is given. With sibling spreads like draw_single, draw_cross, draw_celtic_cross, draw_love, and the parallel rider_waite/lenormand three-card tools, an agent gets no help choosing among them.

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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