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

Annotations already declare readOnlyHint, idempotentHint, non-destructive, and closed-world, so the safety profile is fully covered. The description adds the only non-structured signal — that the response contains plan and remaining carousel count — but says nothing about quota semantics (reset cadence, units, error cases when unauthenticated).

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?

A single short sentence with no filler, and the most useful fact (remaining carousels) is present up front. It is slightly clipped to the point of being a fragment, which costs a point on structure.

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 input params and no output schema, the description is the only place return information can live, and it only names two fields. It leaves unclear what else the account payload contains or what 'carousels left' counts against, which matters for a quota-checking tool.

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 is nothing for the description to disambiguate; baseline 4 applies. The description correctly does not invent parameter behavior.

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 is a noun phrase that describes the payload (the user's plan and remaining carousel quota) rather than stating an action, so the verb must be inferred from the name 'get_account'. It does add concrete content beyond the name, but it does not distinguish this from siblings like get_payment_link or list_carousels.

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?

There is no guidance on when to call this versus alternatives such as get_payment_link or list_carousels, and no prerequisites or exclusions are stated. The agent must infer that this is the quota/plan check, which is implied at best.

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