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

Annotations already declare read-only, idempotent, and non-destructive behavior. The description adds the bulk support capability, which is a useful behavioral detail not captured in annotations. However, it does not mention failure modes or resource-specific behavior, so it does not substantially go beyond the annotation coverage.

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?

The description is concise and well-structured: two short sentences, first stating the primary function, second adding the bulk support detail. No redundant or extraneous content.

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 description lacks essential contextual details, such as what the returned list object contains, what 'query' and 'account' parameters do, or any error behavior. Given the absence of an output schema, these omissions leave the tool's behavior and expected usage incomplete.

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?

The schema has four parameters, but the description only clarifies 'ids' by mentioning bulk support. The required 'id' is implicitly clear from the description, but 'query' and 'account' are completely unexplained. With low schema coverage and minimal descriptive help, parameter semantics are weak.

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 clearly states the tool retrieves a list by ID, reinforced by the explicit endpoint 'GET /api/lists/{id}'. It distinguishes from sibling list operations like create/update/delete, though it does not elaborate on what type of list it returns.

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 bulk support note ('accepts ids for batched execution') offers some guidance for when multiple IDs are involved, but there is no explicit direction on when to use this tool instead of the list endpoint or other alternatives. The context of getting a single item by ID is implied but not stated as a rule.

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