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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds real value beyond that by naming the specific data fields returned (stock, fulfilment, countries, price bundles) and pinning the endpoint and API version, which helps an agent judge whether the call will supply what it needs. It does not mention error behavior for unknown ids, so a 4 rather than a 5.

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 compact fragments with zero filler; the returned-field list and the endpoint come after the core 'one offer by id' statement, so it is front-loaded correctly.

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 compensates by listing the returned fields, and the annotations cover the read-only safety profile. What remains unstated is failure behavior (e.g. a missing or malformed offer id) and any auth scope, which keeps it below 5 for an open-world fetch 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 parameter is documented as a UUID sourced from bol_list_offers, so the schema carries the detail. The description only restates 'by id' and adds no format or provenance guidance beyond what the schema already provides, which is the expected baseline of 3.

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 specific resource ('One offer by id') and enumerates the data it returns (condition, price bundles, stock, fulfilment, countries, product), which lets an agent distinguish it from bol_list_offers without opening the schema. It lacks an explicit verb like 'retrieve' and does not name the sibling it contrasts with, 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?

The phrase 'by id' implies the lookup case, and the schema note that the id comes from bol_list_offers hints at the relationship, but the description itself says nothing about when to prefer this over bol_list_offers or bol_get_competing_offers. Usage is implied rather than stated.

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