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

Annotations already declare readOnly/idempotent/non-destructive, so the bar is met; the description still adds real domain behavior beyond them, namely that an incompatible variant stays purchasable under storefront policy and that 'unknown' is never treated as compatible. This clarifies the semantics of the result rather than just its safety profile.

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 sentences, front-loaded with what is checked and followed by the policy caveat; no filler. The dense phrasing ('advisory activation evidence') is terse but not wasteful.

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?

No output schema exists, but the two sentences implicitly convey the outcome space (compatible / incompatible-but-purchasable / unknown), which is the key return semantic for this check. Missing are any note on return shape or whether evidence is time-sensitive, though for a read-only verdict tool this is close to sufficient.

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%, with currency, language, countryCode and variantId all richly documented in the schema itself, so baseline 3 applies. The description only restates that the variant must be exact and the country explicit, adding no syntax or format detail beyond the schema.

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+resource ('check live advisory activation evidence') scoped to one exact variant and an explicit country, which is clearly distinguishable from catalogue/info siblings like search_catalog or get_store_information. However it never names the closest sibling, get_activation_guide, so the agent must infer the difference.

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: the call is constrained to one exact variant and an explicit country, and the 'exact'/'explicit' framing hints it is a precise per-item lookup rather than a bulk operation. There is no when-to-use statement, no prerequisites, and no routing to get_activation_guide or search_catalog.

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