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

Goes well beyond the readOnly/destructive annotations by disclosing the full payment model: one cent per credited creator, one-cent minimum, 2 maximum, USDC settlement on Celo via x402, and that an unpaid call returns a 402 with the exact invoice instead of data. That last point is critical operational context an agent could not infer from annotations or schema.

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 pricing rule is restated at least four times in near-identical phrasing ('one cent per creator credited', 'Priced per creator credited', the 50-creator example, the paid-route sentence). The pricing content is valuable but the redundancy bloats the definition and pushes the search/filter semantics into the background.

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, and the description compensates by stating the response includes total and nextCursor and by explaining the 402-vs-data branch. Combined with the fully documented six-parameter schema, an agent has enough to call it correctly; only the sibling-routing gap keeps it from a 5.

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 100%, so the baseline is 3. The description reinforces that limit is a cost lever and that cursor comes from nextCursor, but this largely repeats what the schema parameters already state, and it adds no syntax or format detail beyond the structured fields.

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 the specific resource (public creator and brand profiles) and enumerates the fields returned (name, bio, avatar, country, follower counts, verification, account age), which clearly distinguishes a list/directory from a single-profile call. It never explicitly contrasts with the sibling creator_profile, leaving the listings-vs-single-profile routing to the tool name alone.

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 implied through the filter combinations it advertises (?q=, ?limit=, ?verified=, ?minFollowers=, ?sort=) and the cost-control framing of limit. There is no explicit statement of when to use this versus creator_profile or public_posts, and no exclusion guidance beyond the payment behavior.

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