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

Annotations already declare readOnly, idempotent, openWorld and non-destructive, so the safety profile is covered. The description adds genuinely new context beyond that: no API key/authentication is required, and it names the underlying endpoint. It stops short of describing pagination behavior or response shape, but the auth note is real added value.

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?

Three short sentences with zero filler: endpoint, payload, and auth requirement are each stated once and front-loaded. Nothing needs trimming.

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 no output schema, the description usefully enumerates what the leaderboards contain, and the auth note removes a likely blocker. It doesn't cover pagination limits (per_page max 100) or ordering, but for a simple read-only list tool it is nearly sufficient.

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 100%, so page, per_page and the category enum are fully documented in the schema, including the default for category. The description's list of leaderboards loosely maps to the enum values but adds no syntax or default detail beyond what the schema already provides. Baseline 3 applies.

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?

States a specific verb+resource ('Wraps GET /api/house/hall') and enumerates the three leaderboards the tool surfaces, so the agent knows exactly what it returns. It doesn't explicitly differentiate itself from close siblings like list_graveyard or get_house_stats, which is the only thing keeping it from a 5.

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 'No key needed' line gives a useful precondition, but there is no statement of when to reach for this tool versus list_graveyard (also a leaderboard-adjacent read) or get_house_stats. Usage is implied rather than prescribed.

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