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

No annotations are provided, so the description carries the burden of behavioral disclosure. It adds helpful output conventions ('Empty cell = not measured', 'Never a ranking') and implies a read-only view via 'Local board', but it does not explicitly state side effects, data source, or response behavior.

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 description is very concise and each fragment carries information. However, the telegraphic style and lack of a main verb make it slightly cryptic, keeping it from a top score.

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 is the only output documentation. It explains how to interpret empty cells and emphasizes that the result is not a ranking, but it does not specify what rows and columns represent or how open labyrinths actually appear in the result.

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?

The input schema has zero properties and 100% schema description coverage, so there are no parameter semantics to document. The absence of parameter details in the description is acceptable given the baseline for no-parameter tools.

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 never explicitly says that this tool lists open labyrinths; the verb and resource are left to the tool name. 'Local board. Adventure stories vs benchmark Wilson rates' gives some content but remains vague about the actual operation and does not clearly differentiate it from 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 guidance about when to use this tool versus enter_open_labyrinth, labyrinth_action, observe_labyrinth, or seal_attempt. 'Never a ranking' is an interpretation caveat, not a usage direction or alternative-selection rule.

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