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

Annotations already cover the safety profile (readOnlyHint=true, destructiveHint=false), so the bar is lower; the description adds real context beyond them by disclosing that results are grouped per country, that each reason carries a code and description, and that a fully-sellable offer returns nothing. It does not mention permissions or rate limits, but none are implied for a read.

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 dense sentence front-loads the purpose and the endpoint, with no filler. It is slightly overstuffed with nested parentheticals and the repeated 'offer is not for sale' phrasing, but nothing is extraneous.

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?

There is no output schema, so the description must describe the return shape — it does (per-country grouping, code+description pairs, empty when sellable). Combined with annotations covering read-only safety, an agent has enough to call it correctly; only explicit guidance on when to prefer bol_get_offer is missing.

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 coverage is 100% and the single offer_id parameter is fully documented as a UUID with a pattern, so the schema does the work. The description only restates it indirectly through the endpoint path (/offers/{offer-id}), adding no new 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 resource ('reasons an offer is not for sale') and scopes it per country, plus enumerates the reason categories (content, price, stock, shop status, selling rights, on hold, assortment policy). This clearly distinguishes it from bol_get_offer and the list/sibling tools, though it never names a sibling explicitly.

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 the resource name; there is no explicit 'use this when...' or reference to the alternative bol_get_offer for general offer data. The parenthetical about offers that are for sale everywhere having no reasons does usefully signal the empty-result case.

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