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

Annotations already declare readOnlyHint=true, openWorldHint=false and destructiveHint=false, so the safety profile is covered. The description adds useful context about the comparison output contents and the unique_id-with-slug-fallback resolution, but says nothing about item limits beyond 2-3, error behavior for unknown IDs, or latency.

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 short sentences, output shape front-loaded, zero filler. Every clause carries information and nothing is repeated.

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 an output schema present, the description needn't detail return values, and it still sketches them. For a single-parameter read-only tool this is nearly complete; the only gap is any guidance on routing from search_gear into this tool.

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 the single gear_ids parameter is already documented as 'unique_id or slug' in the schema. The description's 'unique_id with slug fallback' restates rather than extends that, so baseline 3 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?

States a specific verb (Compare) and resource (gear items) plus the scope (2-3 items side-by-side) and the shape of the output (specs, pros/cons, verdicts, summary). It is clearly distinguishable from read-oriented siblings like search_gear, but it never names an alternative to route against.

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 by 'compare 2-3 gear items' — an agent can infer this is the post-search comparison step, but there is no explicit when-to-use, when-not-to-use, or pointer to a sibling such as search_gear for discovering items first.

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