get_top_devices

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

No annotations are provided, so the description carries the full burden. It mentions the metric ('unique sessions') and period scope, but does not disclose aggregation behavior, limits on results, timezone handling, or return shape. For a read-only analytics tool, this is minimal but not misleading.

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 a single, front-loaded sentence with no extraneous words. It conveys the core purpose efficiently and earns every word.

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?

Given the 11-parameter schema and no output schema, the description is adequate but sparse. It clearly identifies the output as top device models and the metric as unique sessions, but it does not mention the default period, result count, or how filters interact. The schema covers parameters, so the description is minimally sufficient for a simple report 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?

All 11 parameters have descriptions in the input schema, providing high coverage. The tool description itself adds no parameter-specific semantics beyond 'period' and 'unique sessions', so it does not compensate for any gaps. The schema already handles parameter meaning, making this baseline appropriate.

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 clearly states the tool's function: returning top device models ranked by unique sessions for a given time period. This distinguishes it from sibling tools like get_top_os or get_top_countries by naming the specific resource (device models).

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?

The description provides no explicit guidance on when to use this tool versus alternatives. It neither names alternative tools nor states conditions for preference, relying entirely on the tool name and implicit meaning.

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