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

Annotations already declare this as a safe, read-only, non-destructive query, so the safety profile is covered. The description adds that results come back as ranked values with visitor and session counts, a useful hint about shape, but says nothing about limit defaults, ordering, or empty-result behavior.

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?

A single front-loaded sentence with no filler. The long parenthetical dimension list is slightly heavy but earns its place by enumerating supported dimensions.

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?

No output schema exists, so the description carries the burden of describing returns; it only gestures at 'visitors and sessions' without stating the row shape or ordering. Combined with 90% schema coverage on inputs, this is adequate but not fully complete for a 10-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?

Schema description coverage is 90%, so the schema itself documents parameters such as from/to, period, limit, filters, and timezone thoroughly. The description contributes no additional parameter meaning, which is the correct baseline when the schema does the heavy lifting.

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?

States a specific verb (top values of one dimension) and enumerates the supported dimensions, so the resource is unambiguous. It does not differentiate itself from siblings like get_pages or get_events, which cover overlapping ground, so it stops short of a 5.

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?

Usage is only implied: the agent can infer it is the tool for ranked dimension breakdowns, but there is no explicit when-to-use guidance and no mention of when to prefer get_pages, get_events, or get_overview instead. Adequate but with a clear gap.

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