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

Annotations already declare readOnlyHint and openWorldHint, so the read-only, external-service nature is covered. The description adds the default marketplace fallback but largely echoes the schema's 'Never errors on a missing store' wording, and says nothing about rate limits, result ordering, or pagination behavior for a network-backed search.

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 front-loaded sentences that get to the marketplace rule quickly, with no padding. The trailing 'OpenAPI: searchAmazon.' is mildly cryptic but plausibly useful provenance rather than waste.

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?

For a six-parameter read-only search with no output schema, an agent still lacks guidance on result count, the meaning of limit/occasion/giftCategory, and what the response contains. The marketplace routing is well covered, but the remaining half of the surface is not.

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 50%, so baseline is 3. The description reinforces the marketplace and locale semantics with the default resolution rule, but adds nothing for the entirely undocumented limit, occasion, and giftCategory parameters beyond what their names imply.

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 and resource ('Search Amazon for party organizer / julklappsspel gifts') and scopes it to the user's marketplace, which distinguishes it from catalog-lookup siblings like get_catalog or resolve_product. It stops short of naming those siblings explicitly, so the differentiation is implicit rather than stated.

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?

Gives a concrete routing rule for the marketplace parameter, including the fallback when it is omitted (en-US → amazon.com, else amazon.se), which is actionable context. It offers no guidance on when to choose this tool over get_catalog or resolve_product, so the alternative-selection dimension is missing.

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