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

Annotations already declare readOnlyHint, idempotentHint and non-destructive, so the safety profile is covered. The description adds real behavior: results are scoped to the signed-in user, expired items are included, and output is sorted by date. It does not describe pagination or response shape, keeping it short of 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?

A single sentence, front-loaded with the verb and resource, that packs scope, window and sort order with no filler. Nothing is wasted and the key constraint appears immediately.

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, three optional bounded parameters all fully documented, and rich annotations, the description covers what an agent needs to call it correctly. The remaining gap is return-value detail (ordering is stated, shape and count behavior are not), which is minor for a read-only list tool.

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 all three parameters carry descriptions plus defaults and bounds, so the schema does the heavy lifting. The description only restates the days window and the item categories, adding no format or edge-case semantics beyond 'expired items are included'.

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 verb and resource set (lists the signed-in user's domains, hosting and licence/service renewals) with the expiry-window scope and sort order. That is enough to separate it from check_domain_expiries and list_tracked_domains, though it never names those siblings explicitly.

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 'expire within the given number of days' and clarifies that already expired items are included, which is a meaningful inclusion rule. It gives no explicit when-not guidance or named alternative, so an agent must infer that targeted expiry checks belong to check_domain_expiries.

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