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

With no annotations provided, the description carries the full burden of disclosing behavior, but it only mentions billing cost. It does not state whether this is a read-only operation, any rate limits, error conditions, or what the response contains.

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?

The description is extremely short but under-specified rather than genuinely concise. It wastes space on billing and grouping information while omitting functional details, and has no useful structure.

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 no output schema and no annotations, so the description should explain what analytics are returned and any notable behaviors. It fails to provide any of this context, making it inadequate even for a simple single-parameter tool.

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 schema provides a 100% documented description for the single parameter app_id, including an example and guidance on finding app IDs via the Autocomplete endpoint. The tool description adds nothing beyond the schema, so the high schema coverage establishes a baseline of 3.

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 'App Analytics / Google Play Group: Mobile Apps' simply restates the tool's title and category without any action verb or resource specification. It fails to distinguish this from sibling tools like get_v2_app_analytics_app_store or get_v2_play_store_app_details.

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 guidance is provided on when to use this tool or how it relates to alternatives. It does not mention the App Store counterpart or any other exclusion criteria, leaving the agent without direction for tool selection.

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