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

Annotations already declare readOnlyHint=false, destructiveHint=true, idempotentHint=true, and openWorldHint=false, so the safety profile is largely covered. The description adds genuinely new context by naming the required OAuth scope (part_categories:write), which annotations do not convey. It does not, however, explain the destructive implications flagged by the annotation or what happens to nested/related data when a category is modified.

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 sentences with the action front-loaded and the permission requirement second; no filler. It is slightly under-developed for a destructive mutation, but nothing in the text is wasted.

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 4-parameter mutation with no output schema, the description covers the action, the identifying key, and the auth requirement, and the schema carries the field-level detail and enum semantics. It omits any note on partial-update behavior (are unspecified fields left alone?), reversibility, or what the destructive hint means in practice, leaving real gaps for an agent acting on a destructive 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 all four parameters (id, name, module, description) are already documented in the schema, including the module enum semantics. The description adds nothing beyond the schema, 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 and resource ('Update an existing part category by ID'), which clearly separates it from create_part_category, delete_part_category, get_part_category, and list_part_categories in the sibling set. It stops short of naming the sibling it operates against for reads, but the verb+resource pairing is unambiguous.

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 only guidance is a permission prerequisite ('Requires part_categories:write scope'). There is no statement of when to use this tool versus update_part, get_part_category, or the bulk_update sibling, and no note about which conditions warrant an update over a create.

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