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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds only the 'current' qualifier and the stat categories, but does not disclose auth requirements, caching, or other behavioral details. There is no contradiction with the annotations.

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 a single, front-loaded sentence with a parenthetical that adds relevant detail. It contains no redundant restatement of the title and every element earns its place.

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 zero-parameter, read-only getter with a provided output schema and safety annotations, this description is complete. It names the resource and the dimensions of usage returned, with no prerequisites or input conditions to document.

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 tool takes zero parameters, so there are no parameter semantics for the description to clarify; the baseline for a 0-param tool is 4. The listed categories usefully signal what the returned usage stats cover.

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 uses a specific verb 'Get' plus a clear resource, 'account usage stats', and enumerates the exact categories returned: clients, reports, users, and storage. This differentiates it from siblings like get_account or count_clients, which focus on single entities rather than aggregate usage.

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 phrase 'current account usage stats' implies the tool is for retrieving an account-level usage overview. However, it does not explicitly state when to use it over siblings such as get_account or count_clients, nor does it provide exclusions or alternative routing.

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