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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is covered structurally. The description adds the GET /domains endpoint and the cross-site scope, but says nothing about pagination, result volume, or response shape, so added behavioral value is modest.

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?

One compact sentence front-loads the scope ('all domains ... across sites') and is followed by the endpoint reference. No filler or redundancy.

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 zero-parameter list tool with no output schema, the description adequately conveys what is returned at a high level but omits any hint of return structure or formatting. With annotations covering safety, this is the minimum viable, not a rich definition.

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 per the baseline there is nothing for the description to disambiguate. The description correctly does not invent parameter semantics.

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+resource (all company domains in Kinsta DNS/hosting) and adds scope ('across sites') plus the underlying endpoint. An agent can distinguish it from kinsta_list_sites, but the relationship to the very similar sibling kinsta_list_environment_domains is only implicitly signaled rather than named.

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 only implied: 'all domains ... across sites' hints that this is the company-wide listing versus a per-environment one, but there is no explicit when-to-use, when-not, or named alternative. The agent must infer when to prefer this over kinsta_list_environment_domains.

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