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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, so the safety profile is covered. The description adds real value by enumerating what the comparison returns (proof, age, price, flavor profile, shared/distinct notes, community ratings) — useful since no output schema exists. It does not cover edge behavior such as an unknown bottle name.

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 sentence, front-loaded with the action and resource, followed by the compared fields. No wasted words and nothing buried.

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 usefully lists the returned comparison fields, and both required parameters are documented in the schema. It lacks only minor edge-case behavior (e.g., unmatched bottle names), so it is close to complete for a simple two-argument read 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 both parameters ('UUID or name') are fully documented in the schema, so the description adds nothing about inputs. Baseline 3 applies when the schema does the heavy lifting.

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 ('side-by-side comparison') and resource ('two bottles'), and enumerates the dimensions compared. This clearly differentiates it from sibling read tools like get_bottle or find_similar, which return single-bottle or similarity data rather than a paired comparison.

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 side-by-side framing implies when it applies (two known bottles the user wants compared), but there is no explicit guidance on when to prefer it over find_similar or get_bottle, and no stated preconditions. Usage is inferred from the name and description rather than stated.

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