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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so safety and repeatability are covered. The description adds only the pre-flight-check framing, with no detail on freshness, rate limits, or how allowances are computed. No contradiction, but little value beyond the structured metadata.

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 tight sentences with no filler, and the substantive content (returned fields) leads. The opening noun fragment 'The plan, whether distribution is included...' reads slightly awkwardly as a standalone, which keeps it from a 5, but nothing is wasted.

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 correctly carries the burden of listing the returned values, and it does so concretely. What an agent needs before uploading is present; only edge details (empty credits, expired plan behavior) are missing.

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% and the single 'artist' parameter is fully documented in the schema, including the label-vs-artist connection rule. The description adds nothing about it, so the baseline 3 for schema-covered parameters applies.

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 names the resource (the account's plan) and enumerates exactly what it surfaces: plan tier, distribution inclusion, credits remaining, and track/album/storage allowances. That is specific enough to distinguish it from siblings like get_stats or check_readiness, though it lacks an explicit verb and never states that it is a read-only fetch.

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 gives a clear triggering condition: 'Check before uploading or preparing a submission.' That is actionable context for an agent deciding whether to call it. It stops short of naming alternatives or stating when the call is unnecessary, so it is not a full 5.

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