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

Annotations already establish read-only, idempotent, and non-destructive behavior. The description adds meaningful context beyond those annotations by stating the payment-verification dependency, the 7-day bounded token, and the 'remaining premium actions' payload. No contradiction with 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 dense sentence with no filler. It front-loads the verification purpose, includes the critical payment condition, and states the returned payload, so every clause 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 small read-only status tool, the description covers the precondition, the returned access token, the validity bound, and the remaining premium actions. It could be improved by naming the parameters and describing the unpaid-checkout case, but the essential selection criteria are present.

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 schema has two required parameters with no descriptions and 0% schema description coverage, yet the description does not explain order_key or session_id. The Evercraft checkout context helps infer their domain role, but an agent cannot tell which identifier maps to which concept or what values are acceptable.

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 states a specific action (verify the Evercraft Payments checkout) and a precise result (return the 7-day Career Sprint access token and remaining premium actions). The 'only after provider-confirmed payment' condition also separates this from the checkout-preparation and action-running sibling tools.

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 clearly gives a timing precondition: call only after provider-confirmed payment. It does not explicitly name alternatives or contrast itself with siblings, but the payment-confirmation condition is enough to guide an agent's selection.

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