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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds value beyond that by disclosing the return payload (fitment notes, FAQ, both country codes, dealer-referred shopping link), which matters because no output schema exists. It omits rate limits, auth, or what happens for an invalid/unknown code.

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 dense sentence that front-loads the resource and then lists the returned fields in priority order. The embedded referral token 'zo=30734402' is arguably noise for tool-selection purposes, but the sentence contains no filler.

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 two-parameter read tool with no output schema, the description usefully compensates by enumerating the return payload, and the schema fully covers both parameters. The remaining gap is the absence of routing guidance relative to search_products and list_categories.

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%: the schema already documents 'code' (with ASLQT-EA/ASLQTC-EA examples) and the US/CA country enum with storefront mapping. The description's reference to 'U.S. and Canadian product codes' merely echoes the schema, adding no syntax or format detail beyond it, so the 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?

States a specific verb ('Get') and resource ('product details') scoped to one product, and enumerates exactly what is returned (description, fitment notes, FAQ, US/CA codes, shopping link). This contrasts implicitly with the plural sibling search_products, though the sibling is never named, and the phrase 'Full A1 guidance' is unexplained internal jargon.

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: 'for one product' suggests it is the single-item lookup to pair with search_products, and the mention of 'U.S. and Canadian product codes' hints at the country selector. There is no explicit when-to-use, when-not-to-use, or named alternative, so the agent must infer the routing.

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