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

Annotations already declare readOnlyHint=false and destructiveHint=true, so the mutation profile is known, and the description correctly reinforces this with creation semantics. It adds genuine domain behavior — pieces are inherited from the style unless explicitly overridden via pieceIds — but says nothing about permissions, failure modes, or what happens when a pieceId is not part of the style.

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 the core action front-loaded and the inheritance/override rule immediately after. Nothing is wasted, though the description could have used the remaining space for the undocumented parameters.

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?

No output schema and no annotation coverage of the piece-inheritance model, so the description must carry that logic — which it does well. But for a destructive five-parameter creation tool, leaving three parameters and all error/permission behavior unexplained leaves clear gaps.

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 carries the full burden, and it only explains one of five parameters (pieceIds, and implicitly style_id). The meaning of 'name', 'position' (ordering among parts?), and 'part_class_id' is left entirely undocumented in both schema and text.

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+resource ('Create a part') and names the prerequisite resource ('using an existing style'). It does not distinguish itself from adjacent siblings such as create_part_class, create_piece, or create_style, so an agent must infer the boundary from the names alone.

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 second sentence gives real conditional guidance: use style-inherited pieces by default, and pass pieceIds only for pieces unique to this part. However, there is no guidance on when to call this versus create_part_class/create_style, no prerequisite ordering, and no mention that style_id must reference a pre-existing style.

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