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

Annotations already declare readOnly, idempotent, non-destructive, closed-world. The description adds genuinely new behavioral context beyond them: the result ordering is by Ahrefs Domain Rating descending, which an agent needs to interpret output. It does not disclose result volume or that pagination is offset-based (that lives only in the 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?

Two sentences, zero filler, with the scope and ordering front-loaded and the filtering advice second. Every clause earns its place.

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?

Nine parameters, all enums documented, annotations present, no output schema. The definition covers what the list is, how to narrow it, and how it is sorted; only the shape of a returned site record and page-size defaults are left implicit (the latter is in the schema).

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% and every enum value is spelled out there, so the schema does the heavy lifting. The description only adds the meta-point that all filters are optional and combinable, which is already implied by required=[]; no filter-specific meaning is added beyond that.

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/search) and an explicit resource taxonomy (launch platforms, directories, communities, newsletters, press, review sites that accept product submissions) and adds ordering semantics (highest Ahrefs Domain Rating first). Against the only sibling, get_site, the list-vs-single-site distinction is immediately clear.

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?

"Every filter is optional; combine them to narrow the list" tells the agent how to use the tool (progressive narrowing from a broad list). It gives no explicit when-not-to-use or pointer to get_site for fetching one site's full details, so it stops short of a 5.

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