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

Annotations already flag destructiveHint=true and openWorldHint=false, so the safety profile is covered. The description then adds real behavioral value beyond them: pieces supplied here are shared across every part assigned to this style, which is a cascade effect an agent could not learn from the annotations or schema. It does not state whether duplicate names error or what the response returns, keeping it below a 5.

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 tight sentences with no filler; the sharing behavior, the most consequential fact, is front-loaded in the second sentence right after the create action.

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 tool with no output schema and no schema descriptions, the definition covers the unique sharing side effect well but omits position meaning, validation rules, and whether pieces must already exist. Adequate to call the tool, not fully complete.

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 0%, so the description must carry the parameter load and it only partly does. It clarifies that pieceIds is optional and that those pieces are shared, but leaves position, name, and part_class_id semantics to inference, and the schema's pieceIds items pointer to part_class_id is unexplained.

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?

"Create a style in a part class" names a specific verb and resource and pins the parent scope, which separates it from create_part_class, create_piece, and update_style in the sibling list. It stops short of an explicit contrast sentence against those siblings, but an agent can infer the domain from the wording.

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?

No when-to-use or when-not-to-use guidance is given; nothing tells the agent why to use create_style rather than create_part_class plus create_piece, or when update_style is the better call. The only implicit guidance is that a part class must already exist, conveyed by the required part_class_id phrase.

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