Create 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. It mentions error handling (400 errors returned verbatim) and references the API version, but lacks details on authentication, rate limits, idempotency, or the destructive nature of creation.

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 four sentences long, efficiently conveying purpose, nested structure, error handling, and API reference. It is well-structured and front-loaded, though could be slightly more compact.

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?

Given the nested object structure and lack of output schema, the description could be more complete. It does not explain the return value, required fields in the body, or provide examples. It adequately covers the core action but leaves some gaps.

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 sole parameter 'body' is described as containing item fields, and the description adds that items have nested variants and fields follow the API schema. This adds context beyond the generic schema description, though it still relies on external documentation.

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 action ('Create a new item'), the resource ('item'), and the API endpoint ('POST /items'). It also distinguishes from siblings by mentioning nested variants and the inventory resource.

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 that variant stock should be managed via the inventory resource, but it doesn't explicitly state when to use this tool versus other create tools. There is no guidance on prerequisites or when not to use it.

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