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

Annotations already declare readOnly, idempotent, non-destructive, and open-world behavior, so the safety profile is covered. The description contributes beyond that by specifying the shape of the result — one best run per model, habits kept, remaining gas and water, a watch link, and a run count — which matters because there is no output schema. It leaves unsaid what happens for an unknown or empty challenge, but the content disclosure is substantive.

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?

Everything is packed into one front-loaded sentence that leads with the resource and closes with the returned fields, with no filler or repetition. The middle clause ('with habits kept, gas and water left') is grammatically tangled, but each element carries information.

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?

For a one-optional-parameter read tool with annotations covering safety and no output schema, the description supplies what is otherwise missing: the returned fields and per-model aggregation. Only the error/empty-result behavior and the meaning of 'checked' versus unchecked runs are left implicit, which is a minor gap at this complexity.

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?

There is a single optional parameter with 100% schema description coverage, so the schema already defines 'challenge' as a challenge id defaulting to the newest with runs. The description only restates that default and adds no id format, resolution behavior, or fallback semantics. Baseline 3 is appropriate when the schema carries the parameter meaning.

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 names a specific resource — hand-checked AI runs of the camping game Dispersed 3D, reduced to the best run per model — so an agent knows exactly what it retrieves. It stops short of a clean leading verb ("Get"/"List") and the domain wording is dense, but the scope is unmistakable and no sibling tool overlaps this function.

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?

Usage is only implied: the tool is for looking up leaderboard results for a challenge, and it notes the challenge defaults to the newest with runs. There is no explicit when-to-use statement, no when-not-to-use, and no prerequisites (e.g. whether a challenge must exist first). Because the sibling tools are all campsite-lookup tools, there is no genuine alternative to disambiguate, which keeps this at a viable 3.

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