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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so safety is covered structurally. The description adds genuinely useful semantics beyond that: it identifies the resource as the authenticated user's own data and explains that a null limit means unlimited, which is not derivable from 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?

One dense but well-formed sentence front-loads the resource and scope, with a short trailing sentence carrying the only non-obvious semantic (null = unlimited). No filler.

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?

There is no output schema, so the description carries the burden of describing the return shape; it does so adequately by naming plan tier and per-quota usage, plus the null-limit convention. It stops short of specifying the response structure or whether usage is returned as absolute counts or percentages, leaving a small gap.

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 enum parameter is fully documented in the schema, including the omit-for-all behavior. The description's enumeration of quota areas loosely mirrors the enum values but adds no syntax or format detail, so the baseline 3 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?

Names a specific verb (get) and resource (quota status) and enumerates the exact quota dimensions returned, so an agent can distinguish it instantly from siblings like get_document or list_my_quizzes.

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 description implies the usage context (checking the authenticated user's plan tier and consumption), but it never states when to call this versus alternatives or any prerequisite conditions. No sibling overlap exists to disambiguate, so the omission is mild but present.

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