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

Annotations already declare readOnlyHint, openWorldHint, and idempotentHint, so the lower bar applies. The description adds useful context beyond them: that the tool is free, requires no payment, and returns static data — reinforcing safe, repeatable, side-effect-free reads. It stops short of describing return shape or pagination, which the output schema presumably covers.

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?

It is front-loaded with the label ('FREE — THE LEVEL CATALOG') and enumerates its contents efficiently. The free/static/no-payment idea is stated three times across the sentence, which is mild redundancy, but the overall length is justified for a catalog that must advertise its contents.

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?

An output schema exists, so return-value detail is not required. The description enumerates exactly what the catalog contains (level bands, cost ranges, XP values, rank ladder, thresholds, discounts) and confirms it is static and free, giving an agent everything needed to decide to call it and what to expect.

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 tool takes zero parameters, so the baseline is 4. The description correctly implies a parameterless lookup with no filtering options, and there is nothing in the schema for it to clarify or contradict.

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 states a specific resource (the Intelligence Level bands IL1..IL5+ and the earned rank ladder) with concrete contents: credit cost ranges, XP per ask and per correct call, XP thresholds, and credit-cost discounts. It is easily distinguished from siblings like leaderboard, profile, pricing, or profile, since it is explicitly a static reference catalog rather than player state or a query endpoint.

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?

It gives clear usage context ('Read this before you ask') plus the reason to consult it (how the price of a question and earned XP are derived), which is strong guidance for a reference tool. It does not name alternatives or explicit when-not conditions, but for a static self-contained catalog there isn't much to exclude.

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