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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds the mild context that a single department is returned, but provides no additional behavioral details such as error handling or what happens if the ID is invalid. It is consistent with annotations; no contradictions.

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?

A single sentence with no filler. It front-loads the action and target, and includes the key qualifier 'by Id' immediately. Every word earns its place.

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 two parameters and no output schema, the description covers the essential use case. It does not explain the return structure or failure modes, but these are largely inferable for a standard 'get' operationcase. The interplay of the optional 'company' parameter is documented in the schema, so the description is complete enough for selection and invocation.

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 input schema already documents both 'id' and 'company' with clear descriptions. The tool description only reiterates 'by Id' without adding semantics about the 'company' parameter or ID format beyond what the schema provides. This meets the baseline for fully described schemas.

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 verb ('Get'), the resource ('a single department'), and the identifying mechanism ('by Id'). This distinguishes it from sibling tools like get_department_sales (sales data) and search_departments (search without a known ID). No ambiguity remains about what the tool does.

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 'by Id' phrasing implies the tool is appropriate when the caller already has a QuickBooks department ID, but it does not explicitly point to alternatives like search_departments for lookup-by-name or list scenarios. Usage context is implied rather than stated.

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