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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, and openWorldHint=false, covering the full safety profile. The description adds nothing beyond that—no note on error behavior for a missing ID, no return-shape context, and no scoping constraints.

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 seven-word sentence, front-loaded with the verb and resource and free of filler. Its brevity is appropriate for a trivial lookup, though it is arguably under-specified rather than tightly optimized.

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 one-parameter read with rich annotations and a fully covered schema, the definition is minimally sufficient. Because there is no output schema, the description could have said what the returned category contains, but the omission is minor for a lookup tool.

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%, so the single 'id' parameter is already fully documented as a UUID in the schema. The description's 'by ID' merely echoes the schema without adding format or semantic detail, so the baseline of 3 applies.

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 (get), resource (part category), and scope (single, by ID), so it is distinguishable from list_part_categories and the create/update/delete variants. It does not, however, explicitly name those siblings or route the agent between them.

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 offers no when-to-use guidance, no prerequisites, and no indication of when to prefer list_part_categories or get_part instead. 'By ID' implies an ID must already be known, but this is inferred rather than stated.

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