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

Annotations already declare readOnlyHint, non-destructive and openWorld, so the safety profile is covered. Beyond echoing the HTTP route, the description adds nothing: no not-found behavior, no note on whether the response includes nested data or how openWorld affects results.

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?

Two short fragments, zero waste, and the resource identification is front-loaded. It stops just short of being too thin to stand on its own.

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?

A two-parameter read tool with no output schema needs little prose, and the description plus the rich schema are just enough to call it. Missing: failure behavior for an invalid id and what the returned record contains.

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 both parameters — the required item_id and the bg/en language enum — are fully documented in the schema, which sets the baseline at 3. The description contributes no additional parameter meaning.

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 ('One catalogue item by id') and pins the underlying endpoint GET /items/{id}, so an agent can distinguish it from invbg_list_items and from the other get_* tools. Differentiation is real but implicit — the sibling list is never named.

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 gives no when/when-not guidance and names no alternative. The only routing hint (that ids come from invbg_list_items) lives in the schema's parameter description, not in the tool description.

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