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

No annotations are present, so the description carries the behavioral burden. It communicates a read-style reporting query and shows that filters can be combined in one call, but it does not disclose sorting direction, pagination, default grouping, or explicitly confirm read-only behavior, leaving some traits to schema defaults.

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 short sentences with no filler; the first states the operation and scope, the second gives a concrete example. Every word earns its place and the content is front-loaded.

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 9-parameter tool with no annotations and no output schema, the description is adequate but sparse: it covers overall purpose and an example while the schema covers parameter details. It would be more complete with a pointer to sibling tools and a note on result ordering or pagination, but it is not fatally incomplete.

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 89%, so the schema does most of the parameter documentation work. The description adds the useful insight that country and device are optional filters that can be combined in one call, but it does not explain parameter formats or defaults beyond what the schema already provides.

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 returns the top queries, pages, countries, or devices over a time period and gives a concrete combined-filter example. It is specific about the resource and ranking mode, though it does not explicitly distinguish it from sibling tools like query or page_queries.

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 conveys the primary use case: retrieving top dimension values for a period, optionally filtered by country/device, and the example 'top pages in Germany on mobile' makes the intended invocation unmistakable. It does not name alternatives or state when not to use it, but the context is clear enough for basic selection.

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