get_top_devices

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

With no annotations, the description must carry the full burden of disclosing behavior. It states that the result is top device models by unique sessions, but does not mention ordering, default limits, pagination, side effects, authentication needs, or that this is a read-only operation. The agent is left without safety or operational context.

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, focused sentence that directly states the tool's purpose without superfluous words. It earns its place and is easy to parse at a glance.

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?

Despite a complex 11-parameter schema and no output schema, the description provides minimal context. It does not describe the return format (e.g., list of objects, count of top items), default sorting, how filters interact, or what happens when no data matches. The lack of annotations further increases the need for a richer description.

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 coverage is 100%, so the baseline is 3. The description adds the key semantic that 'top' is measured by unique sessions, which is not present in any parameter description. This clarifies the meaning of the result and helps interpret filters like granularity and period.

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 identifies the output as top device models by unique sessions, which is a specific query/resource. It distinguishes from sibling tools like get_top_os and get_top_countries by naming the device model dimension.

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 gives no explicit guidance on when to use this tool versus alternatives. It does not mention exclusions, prerequisites, or compare with sibling tools. The phrase 'for the period' is a vague temporal hint but not actionable guidance.

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