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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is known; the description adds that output is grouped and localized and claims completeness ("every acquisition route"). It does not say what happens when an id matches nothing, whether results span datasets, or how the localization is applied. Useful but thin context beyond the annotations.

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?

Two sentences: trigger first, then behavior, with no filler. The mixed-language phrasing (Chinese trigger, English behavior) is slightly inconsistent but each part earns its place, and the route enumeration is compact rather than padded.

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?

There is no output schema, three parameters at 0% description coverage, and two enums whose meaning is never explained. The description covers what the tool returns conceptually but leaves everything an agent needs in order to actually construct a correct call — id format, kind defaults, lang selection — undocumented.

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 description coverage is 0% and the description explains none of the three parameters. "Grouped and localized" faintly implies the lang parameter, and the item-type list hints at kind, but id (string or integer), kind's enum and default, and lang's enum are left entirely to the schema. With zero coverage the description is responsible for compensating and does not.

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 gives a specific verb and resource ("Return every acquisition route for an equipment/item/vision") and enumerates the route types covered: event grants, chests, quest rewards, shop stock, recipes and map points. That is concrete enough to distinguish it from generic lookups. It does not, however, distinguish it from the sibling tool find_drops, whose name suggests overlapping drop-source behavior.

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?

The Chinese trigger clause explicitly names the user question that should route here ("where is this equipment/item obtained", "how to get a vision"), which is genuine when-to-use guidance. It gives no when-not guidance and never mentions alternative tools or how to choose between this tool and find_drops when both may surface acquisition data. Usage is implied rather than routed.

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