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

Annotations already establish read-only, idempotent, non-destructive, closed-world behavior. The description adds non-obvious behavioral details: ranking is by share of positive player reviews, a 500-review minimum applies, critic scores are ignored, and omitting month selects the latest ranked month. It does not describe return shape, but the output schema covers that.

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?

Four compact sentences, front-loaded with the ranking rule and threshold. Each sentence adds a distinct rule — ranking basis, minimum review count, critic-score exclusion, and default month — with no filler.

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-parameter, read-only query with an output schema and rich annotations, the description supplies the essential ranking methodology, threshold, exclusions, and default. Nothing an agent needs to select or invoke it correctly is missing.

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 single month parameter is fully described in the schema, including the YYYY-MM pattern and the ranked values available. The description adds the default behavior when month is omitted, which is not stated in the schema. With 100% schema coverage, this is a genuine semantic addition.

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 resource (a month's new video games) and ranking metric (share of player reviews that recommend them). It also gives the 500-review threshold and the critic-score exclusion. It does not explicitly distinguish the tool from siblings such as search_games or get_release_calendar, which keeps 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?

There is no explicit when-to-use or when-not-to-use guidance and no named alternatives. The default-to-latest-ranked-month note and the ranking threshold imply the intended browsing use case. This is adequate but leaves sibling selection to inference.

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