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

Annotations already cover the safety profile (readOnlyHint, idempotentHint, destructiveHint=false, openWorldHint=false), so the description's burden is lower. It adds genuinely non-annotated context — the credit cost (10 credits, Tier 1) and the Agrippa grouping — but says nothing about what a call yields or how it behaves.

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?

The text is short, front-loaded and free of padding, which is good structurally. However it is arguably undersized for a tool that must be distinguished from 15 sibling geomancy figures, so brevity comes at the cost of usefulness.

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?

With an output schema and full annotation coverage, the description need not explain return values, but it still omits the core fact of what the tool produces and how it differs from sibling figures. For a one-of-many esoteric lookup, that gap leaves the definition materially incomplete.

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?

Both optional parameters (fields, precision) are fully documented in the schema at 100% coverage, so the schema carries the semantics. The description adds nothing about how to use compact mode or precision, making this a baseline 3.

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 is a keyword gloss of the figure's meaning ('Happiness, optimism, healing') that essentially restates the title 'Laetitia: Joy'. It never states the tool's action — e.g. that it returns a geomancy reading/interpretation for the Laetitia figure — so an agent cannot tell what it actually does versus its 15 geomancy siblings.

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, no mention of alternatives among the many astroway_geomancy_* siblings, and no prerequisites or exclusions. Only the group tag and credit cost are provided, which do not help an agent choose this tool over a sibling figure.

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