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

Goes beyond the lone destructiveHint=true annotation by naming the exact API surface (POST /items) and stating that the new item is returned. It still omits duplicate-handling, required scopes, and whether the create is reversible, so it stops short of full behavioral disclosure.

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?

Three dense sentences: mutation warning first, then required params and the escape hatch, then endpoint and return value. No filler and nothing buried late.

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 7-parameter create tool with no output schema, it covers required inputs, optional-field routing, endpoint, and return value. The remaining gap is failure behavior (validation errors, duplicate items), which matters for a mutating call but is a modest omission.

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 coverage is 100%, so the baseline is 3, but the description adds real value by enumerating attributes that can be passed through `fields` — description, tax_class, tax_type, country, stock — several of which are not typed properties in the schema. That makes the escape-hatch parameter actionable rather than abstract.

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 and resource ("create a product/item in the catalog") and leads with the MUTATES marker, which separates it cleanly from the read siblings (quaderno_get_item, quaderno_list_items) and from the other create_* tools. An agent can identify it without opening the schema.

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?

It tells the caller to supply name + unit_cost and to route other attributes through `fields`, which is practical calling guidance. It never says when to prefer this over a sibling such as quaderno_request or the update path, so tool selection is only implied.

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