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

Annotations already cover safety (readOnlyHint, idempotentHint, destructiveHint=false), but the description adds material context they cannot express: per-call price ¥0.2, billing only on successful calls, and automatic refund on failure or empty results. That cost profile is exactly the kind of information an agent needs before putting this in a loop. It stops short of 5 only because pagination/coverage limits for very large item catalogs are unstated.

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?

Four tight sentences: what it does, what it returns, when to use it, what it costs. The most decision-relevant facts (resource and returned fields) are front-loaded, and no sentence is 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?

With no output schema, the description correctly compensates by listing the return fields, and it also supplies the cost and refund policy. It is complete enough to call the tool correctly; the only gap is the lack of routing guidance against the other three 1688 siblings.

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%, so both parameters are already documented in the schema, including the _token fallback and the preferred X-FW-Token header. The description adds no format or syntax detail for item_id, 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+resource (获取1688商品详情) and enumerates exactly what comes back (标题、阶梯价、起订量、SKU、供应商信息、主图), so the agent knows this is a single-item detail fetch. It does not explicitly contrast itself with the adjacent item_search_1688 or item_get_company_1688, which keeps it 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?

"做单品价格监控、库存比对时用" gives a concrete use case that implies when to reach for this tool. However, it never states prerequisites (e.g. that an item_id must first come from item_search_1688) or when to prefer a sibling such as item_review_1688 for review data.

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