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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered. The description adds that the response is composed of several distinct lists (breakouts, steady sellers, range jumps, streaks), which is useful structural context, but says nothing about ordering within lists, empty-list behavior, or whether results are cached per week.

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 sentence, front-loaded with the core idea and then enumerating the categories. It is efficient, though the phrasing is more promotional than precise.

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 simple two-optional-parameter read tool with no output schema, the description covers what kinds of entries appear, which is the main thing an agent needs. It stops short of describing the shape of the response (four separate lists, each capped by limit), which would materially help an agent interpret results.

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% and both parameters carry their own descriptions, including the 1-25 range, the default of 10, and the week format pattern. The description adds no meaning beyond that — notably it never clarifies that limit applies per list or that edition_id defaults to the latest week, though the schema already states both.

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?

"Who is moving this week" plus the four categories (breakouts, steady sellers, sales range jumps, growth streaks) tells the agent what content comes back, but the verb is implicit and it never says the tool returns multiple ranked lists of creators. It also gives no hint of how it differs from siblings like compare_creators or get_chart.

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?

There is no when-to-use or when-not-to-use guidance and no reference to any alternative tool. An agent must infer from the category names alone that this is a weekly leaderboard snapshot rather than a per-creator lookup.

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