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

Annotations cover the read-only safety profile (readOnlyHint=true), lowering the bar. The description usefully adds scope constraints (authenticated user, successful-only, most-recent-first ordering, cursor pagination). It does not disclose rate limits, page size, or result volume, so a 3 is appropriate.

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 tight sentences, front-loaded with purpose, then filters, then endpoint. No filler, though the REST endpoint reference is marginally redundant.

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 read-only list tool with full schema coverage and annotations, the description is essentially complete: purpose, filters, ordering, pagination, and scope. No output schema exists, but success-only sales is stated, so minimal further detail is needed.

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 schema already documents all six parameters with formats and semantics. The description adds only a summary of filter categories and mentions page_key pagination, roughly matching the schema baseline.

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 (List/filter), resource (successful sales), scope (authenticated user's), sort order (most recent first), and even names the underlying REST endpoint. Clearly distinct from the sibling gumroad_get_sale (singular get) and other list_* tools.

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?

Implies usage via 'successful sales' and filter support, but gives no explicit when-to-use guidance or when to prefer gumroad_get_sale for a single sale vs this list. No exclusions stated.

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