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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds only that each result carries quality, pricing, and link type attributes; it says nothing about pagination behavior, result volume, or how 'featured' is determined.

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 no filler; the resource and the highlighted attributes come first. It is efficient, though arguably too short for a 12-parameter tool.

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 12-param, 4-enum tool with no output schema and only safety annotations, the description is thin. It omits the required site/project scoping, the meaning of the view and sort options, and any pagination guidance an agent needs to call it correctly.

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 0% with 12 parameters, so the description carries the burden. It gestures at quality, pricing, and link type concepts but leaves the required projectId/siteId scope, pagination, view/sort enums, search, and accountRequirements entirely undefined.

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?

The description gives a specific verb ('search') and resource ('library of directories and other backlink sources'), and the 'quality, pricing, and link type' clause clarifies this is a source catalog rather than actual backlinks. It does not, however, differentiate itself from closely-named siblings such as list_backlinks, list_backlink_submission_sources, or check_site_backlinks.

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 statement of when to use this tool versus the several other backlink/source listing tools, and no prerequisites or context. The mention of quality/pricing/link type hints at available dimensions but does not say when to apply them.

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