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

Annotations declare the safety profile (not read-only, idempotent, non-destructive), and the description adds genuinely new context: it requires an account token (auth need), the consent gating model, and that it does not charge (no billing side effect). These go beyond what the annotations convey.

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?

Three short sentences, front-loaded with the auth requirement and the core action. 'Does not charge' is a useful aside but slightly tangential; overall tight with little waste.

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 single-boolean mutation tool with annotations already covering the safety profile and no output schema, the description supplies the key missing context: consent semantics, auth requirement, and absence of cost. Nothing essential is missing, though return behavior is unstated (acceptable given no output schema).

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 100% and the single boolean 'featured' is fully documented in the schema itself ('true: sites may be considered. false: sites are not considered.'). The description adds no additional parameter meaning, so the baseline of 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?

States a specific verb ('Sets') and a precise resource/behavior (whether the account's sites may be considered for Site of the Month), with the opt-in condition made explicit. An agent can distinguish this from siblings like site_of_the_day_badge or award_readiness without opening any schema.

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 usage through context ('A site is featured only after the account holder agrees') but never states when to call this versus alternatives, nor describes prerequisites beyond the account token. Usage is inferable rather than explicit.

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