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

Annotations already declare readOnly, idempotent, non-destructive, closed-world behavior, so the safety profile is covered. The description adds genuinely useful non-annotation context (cost of 10 credits / Tier 1 and the tool group), but says nothing about layout, ordering, or what the six positions represent.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Very short and front-loaded: the core spread description comes first, with group and cost as trailing structured tags. Nothing is wasted, though the description is arguably too thin rather than optimally sized.

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

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, leaving the description only needing to convey purpose and usage. It conveys purpose adequately but leaves usage, spread layout, and the undocumented parameters unaddressed, which is a clear gap given the enormous sibling set.

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

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

Schema coverage is only 40%; seed, question, and allowReversed are undocumented in the schema, and the description compensates for none of them. It adds zero parameter meaning, so the two described params (fields, precision) carry the schema alone.

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

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

The description states a specific resource and scope ('6-card three-person love dynamics') that adds concrete detail (6 cards, three people) beyond the title 'RWS: Love Triangle'. It lets an agent distinguish this spread from other RWS draws like draw_relationship or draw_three_card, though it never uses an action verb to make explicit that cards are drawn.

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

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

There is no when-to-use guidance and no mention of alternatives or exclusions. The spread name implies a love-triangle scenario, but with a sibling like draw_relationship the agent is given nothing to decide between them.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.