get_item

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. While the HTTP method GET signals a read-only operation, the description does not mention error behavior (e.g., 404 for missing item), authentication requirements, or response format. The description is too sparse to satisfy transparency expectations without annotations.

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?

The description is a single, concise sentence that immediately conveys the tool's purpose and endpoint. It is front-loaded with the action and resource, with no wasted words.

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 simple get-by-ID tool with one parameter and no output schema, the description adequately covers the core purpose. The return value (item details) is implied by the description. It is not exhaustive, but it is complete enough given the tool's simplicity.

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?

The input schema already provides a 100% description coverage for the only parameter (id is described as '商品 ID'). The description merely echoes the parameter in the endpoint path and adds no additional semantic value beyond the schema, so the baseline of 3 is appropriate.

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?

The description clearly states the tool gets detailed information for a specific item, including the exact HTTP endpoint (GET /v1/items/{id}). This explicitly identifies the resource and action, distinguishing it from list_items (which lists items) and get_product (which may fetch product-level data).

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?

The description implies when to use it (when you need details for a single item by ID), but it does not explicitly mention scenarios when to avoid it or alternative tools. There is no direct comparison with siblings like list_items or get_bundle, leaving the usage context largely implicit.

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