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

No annotations are present, and the description adds a meaningful behavioral caveat: country coverage can overlap and does not represent country-specific exposure or audience preference. That is genuine context beyond the schema. It still does not disclose the return shape or whether the output is per-date or aggregated.

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?

Two focused sentences: the first states what the tool returns, the second clarifies an important interpretation trap. No filler or repetition.

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 read-only reporting tool with no output schema, the description does enough to set expectations but leaves the output shape ambiguous. The caveat about overlap is useful, but an agent still won't know whether the result is per-country, per-game, per-date, or a single aggregated object.

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?

All four parameters are documented in the input schema with descriptions and defaults, so the schema carries the parameter burden. The description adds no new semantics about the parameters, such as how platform or game_id affect the result.

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?

Description states a specific verb and resource: 'Get game delivery-country coverage for a date range.' It also disambiguates the metric from exposure or audience preference, and the conversational definition clearly separates it from sibling tools like get_game_platform_stats or get_game_delivery_summary.

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 describes the high-level use case (date-scoped country coverage) and adds interpretative context about overlapping coverage. However, it does not explicitly tell an agent when to use this tool versus a sibling, nor when not to use it or what alternatives exist.

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