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 covered. The description adds the auth scope requirement, which is valuable, but it does not explain update semantics such as whether omitted fields are left unchanged or cleared, which matters for a destructive update.

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, front-loaded with the operation and the lookup key, with the auth requirement following. There is no wasted wording.

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?

The schema fully documents the 13 parameters and there is no output schema to explain, so major gaps are limited. However, for a destructive 13-parameter update tool, the description omits the crucial patch/replace semantics and does not mention what happens to fields not supplied.

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 13 parameters are documented in the input schema. The description only confirms that id identifies the part and adds no syntax or behavioral detail beyond the schema's own descriptions, making the baseline 3 appropriate.

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 states a specific verb (update), resource (part/inventory item), and lookup key (by ID), which cleanly separates it from create_part and delete_part. It does not explicitly distinguish itself from update_asset_part or update_infrastructure_asset_part, but the name and wording make the target clear.

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?

It states the required parts:write scope, which is a useful prerequisite, but gives no guidance on when to choose this over bulk_update, update_asset_part, or how to handle partial updates. Usage is implied rather than explained.

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