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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds minimal behavioral context beyond that – it notes the dataset is a daily time series, which hints at granularity, but says nothing about pagination limits, result caps, or what an app_id retrieval looks like in practice.

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?

A single sentence, front-loaded with verb and resource, and the parenthetical characterization is high-value. No waste.

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?

The tool has 5 optional parameters, an output schema, and full schema coverage, so much of the burden is already carried by structured fields. However, in a family with numerous Steam time-series/charts tools, the definition does nothing to help the agent disambiguate or understand what the dataset's snapshot vs. history semantics are. Adequate but with a clear routing gap.

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 description coverage is 100% and each parameter (date, page, sort, app_id, page_size) is documented in the schema with defaults, enums, and constraints. The description adds no parameter detail beyond what the schema provides, so 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?

The description states a clear verb (Search) and resource (Steam player-counts dataset), and adds the useful parenthetical 'daily concurrent-player time series' to convey what the data actually is. It does not, however, differentiate from the many Steam siblings (steam_players, steam_charts_concurrent, datasets_steam_charts_search), so an agent can't tell from this line alone which Steam player tool to pick.

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?

No when-to-use guidance, no when-not-to-use, no mention of alternatives. Given the dense Steam sibling cluster (steam_players, steam_charts_concurrent, steam_charts_most_played, datasets_steam_charts_search), the absence of any routing hint is a real gap.

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