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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered structurally. The description adds the scoping detail that the domains are those the creator has linked to, but does not disclose output ordering, duplicates, pagination, or format. This is consistent with annotations and minimally sufficient for a read-only list with no parameters.

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 states the action and the resource with no filler. The phrase 'for filtering' earns its place by signaling the intended use case.

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?

Given the tool has no parameters, rich safety annotations, and a straightforward output implied by 'List the domains,' nothing necessary for correct invocation is missing. The absence of an output schema is not a gap because the description names the returned entity type.

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?

There are zero parameters, so schema description coverage is trivially 100% and the description carries no parameter-semantics burden. The baseline of 4 is appropriate because no additional parameter meaning is needed.

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 uses the specific verb 'List' and identifies a concrete resource: 'the domains the creator has linked to.' It also adds the purpose 'for filtering,' which differentiates it from sibling list tools such as list_link_tags and list_social_links.

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 description offers only an implied usage signal: it says the list is 'for filtering,' so an agent can infer to use it when domain-level filtering is needed. It does not name alternative tools or state when not to use it, so explicit exclusion guidance is absent.

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