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

Annotations already declare readOnlyHint=true and destructiveHint=false, so safety is covered; the description reinforces this with 'Read-only' and adds real value by enumerating return contents (comparison_id AND ss_id for list; mismatch %, status, labelled baseline/current/compared URLs for get). It does not discuss pagination behavior, which would have helped.

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?

Dense and front-loaded: the primary list/get capability comes first, followed by the key value proposition and a trailing safety note. The standalone 'Read-only.' repeats the annotation, a minor redundancy, but nothing else is wasted.

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?

With 8 parameters, no output schema, and only readOnly annotations, the description does the necessary work of summarizing what each action returns. It is nearly complete for agent selection; only pagination/filtering behavior and its relationship to smartui_comparison_analyze are left unstated.

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%, with each of the 8 parameters already documented in the schema including the list-only markers and the list/get enum. The description adds no parameter-level detail (formats, defaults, edge cases) beyond what the schema provides, so the 3 baseline applies.

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 names a specific resource (comparisons) with two clear modes (list in a build vs get one), plus the fields each returns. It is easy to distinguish from the other smartui_* siblings by name, but it never explicitly differentiates itself from smartui_comparison_analyze, so it stops short of a 5.

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?

It hints at intent with 'This is how you obtain a comparison_id — you never need the dashboard', which tells the agent why to call it. However, it gives no when-not guidance and does not route the agent between this tool and the nearby smartui_comparison_analyze or smartui_build_query alternatives.

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