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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so safety is covered; the description's contribution is the 'right now' live-fetch framing, which tells the agent results are fetched fresh rather than cached. It says nothing about failure modes (store unreachable, offer delisted) or latency, which matter for an open-world call — a meaningful remaining gap but not a contradiction.

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 front-loaded sentence with the action and resource first and the freshness qualifier second. Nothing is redundant or padded.

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 a full output schema present, return values need no explanation, and the single required parameter is fully documented by the schema. What remains thin is behavioral coverage around a live external fetch — error conditions and whether a failed re-check returns stale data or an error.

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?

One parameter at 100% schema description coverage, so the schema already explains offer_id and even its origin in search_products. The description adds no syntax, format, or constraint information beyond that, which is the expected baseline case rather than a strength.

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?

Specific verb+resource: 'Re-check one offer's price and stock' names exactly what is fetched and that it is a single offer. It stops short of explicitly distinguishing itself from search_products or get_store in the prose, though the schema's offer_id reference ('The id from search_products') does that work.

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?

'Re-check ... right now' implies the use case (refreshing a stale offer) rather than stating it, and no alternative is named. An agent can infer when to reach for this over search_products, but the description never says so and offers no exclusions or preconditions.

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