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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered. The description adds the returned metric set and the comparison cardinality, but says nothing about behavior on an unknown/invalid id, partial results, or result ordering. With annotations carrying the safety burden, this is adequate but not rich.

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 the verb first, scope second, and the payload enumerated as a compact list. No filler, no restatement of the title.

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?

There is no output schema, so the enumeration of returned metrics (sales range, 8-week history, videos in 30 days, approval rate, sample delivery, badges) usefully substitutes for one. For a one-parameter read-only tool that is close to complete; only the id-format and minimum-cardinality details are soft.

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 the single 'ids' parameter is documented as 'Up to 4 slugs or creator ids', so the baseline is 3. Notably, the description says '2 to 4 creators' while the schema allows minItems=1, a small inconsistency an agent may notice; otherwise the description adds no format detail (id vs slug mixing) beyond the schema.

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 and resource ('Compare ... creators side by side'), plus the exact scope (2 to 4) and the seven metrics returned. An agent can immediately distinguish this from get_creator (single creator) and search_creators (discovery) without opening the schema.

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 metric list implies the use case (side-by-side evaluation of a small set of creators), and the '2 to 4' bound implicitly rules out bulk comparison. However, there is no explicit when-to-use, when-not-to-use, or named alternative (e.g., 'use get_creator for a single profile'), so routing depends on inference.

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