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

Annotations already declare readOnly, idempotent, non-destructive and open-world, so the safety profile is covered. The description adds genuinely new behavioral context: the authentication requirement (`Auth: linked`), the fact that the allowance is temporary, and fields like `ramp`, `account_mode` and `days_to_sunset` that reveal usage ramping toward a sunset. It stops short of explaining what happens when the allowance is exhausted or how stale `reset_at` figures can be, so not a 5.

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?

Labeled lines for purpose, Use, Inputs, Returns and Auth make it scannable and front-loaded, with no filler sentences. Every line carries information an agent would otherwise have to infer.

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 enumerates the returned fields explicitly, and it states the auth mode and the v1 parameter constraint. For a single-parameter read tool, nothing material is 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 coverage is 0%, but the description fully compensates for the single parameter by explaining that `period` only accepts "current" in v1, which is the key semantics an agent needs beyond the enum. No required parameters and a default are also clear from the schema, so the gap is closed.

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 resource and scope: the linked account's current-period usage against its temporary allowance, including the 80% warning and reset time. That is unmistakably distinct from the sibling set, which is entirely catalog/artist discovery tools, so an agent can route here without ambiguity.

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 `Use:` line gives explicit trigger conditions: when the user asks how much is left, and after a quota_exceeded or quota warning. These are concrete invocation contexts rather than implied ones, and no competing sibling covers the same need, so no alternative routing is required.

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