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

Annotations already cover readOnly/idempotent/non-destructive/closed-world, and the description adds real value beyond them by describing what comes back: parts with typical prices, fitment notes, unlisted items, and a shareable link. It omits failure behavior (e.g., bike or style not matching) and whether results are cached or freshly generated.

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?

Three sentences, front-loaded with the resource definition, then return contents, then the action to take. The style enumeration duplicates the schema slightly but stays short and readable.

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 no output schema, the description carries the return-value burden and does so adequately: parts, prices, fitment notes, omissions, and a link. Defaults and accepted inputs are covered by a fully described schema, so nothing essential is missing for correct invocation.

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 bike examples, year fallback behavior, and accepted style values all documented in the schema. The description repeats the style list and mentions model year but adds no new semantics, 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?

The description states a concrete verb+resource ('A ready-made build for one bike, model year and style') and enumerates the style options, so the agent knows exactly what it fetches. It stops short of differentiating from the sibling make_build_link, which also concerns links, leaving a small ambiguity.

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 a clear output-side instruction ('Give the rider that link'), but no explicit when-to-use versus get_parts or make_build_link, and no guidance on handling an unknown bike. Usage is implied by the resource rather than stated.

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