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

The readOnlyHint=true annotation already tells the agent this is a safe read, so the description carries only a reduced burden — yet it adds nothing behavioral beyond repeating the read nature ('GET ... read.json'). Error/not-found behavior, whether a missing id errors or returns empty, and response shape are all undisclosed.

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 with no filler and the core action front-loaded. It is efficient, though telegraphic enough that it reads more like a stub than a polished definition.

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 one-parameter, read-only lookup with no output schema, a minimal description is nearly sufficient, but it says nothing about the returned entity or failure modes, which is the only remaining gap for an agent calling it correctly.

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% and the single id parameter is fully documented in the schema (including its source tool and positive-integer constraint), so a baseline of 3 applies. The description's 'by id' restates the schema without adding format or edge-case 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-plus-resource ('One inventory article by id'), which is clearly distinguishable from the sibling cashctrl_list_articles (plural list) and from the other cashctrl_get_* tools by its 'article' resource. It is terse but unambiguous about what is fetched.

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 phrase 'by id' implies the precondition that an article id is already known, but the description never names cashctrl_list_articles as the way to obtain one (that pointer lives only in the schema) and gives no when-not/exclusion guidance. Usage is inferable rather than stated.

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