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

Annotations already declare readOnly, idempotent, and closed-world, so the safety profile is covered. The description adds value beyond that by disclosing the 25-item batch ceiling and clarifying that the tool reports existence per part rather than failing outright, though it says nothing about behavior on malformed or unknown part numbers.

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 zero waste; the action and the batch cap are front-loaded and the return behavior follows immediately.

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?

With no output schema, the description carries the burden of describing returns, and it does so at a high level (per-part identity summary plus existence flag). It is complete enough to invoke correctly, though the specific fields of the 'identity summary' remain unspecified.

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?

There is only one parameter and schema coverage is 100%, with maxItems/minItems already encoded in the schema. The description restates the 25-item limit but adds no format, normalization, or duplicate-handling semantics beyond what the schema provides.

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 (look up part numbers against the PartsTable catalog), scopes it as a batch with a max of 25, and summarizes the return. It implicitly distinguishes itself from the single-part sibling get-part via the batch framing, but never names any sibling explicitly.

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 batch nature with a 25-item cap implies when this is preferable to a single-part lookup, but the description gives no explicit when-to-use/when-not guidance and never mentions get-part, get-substitutes, normalize-pn, or validate-pn as alternatives.

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