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

Annotations already cover the read-only, idempotent, non-destructive profile, and the description layers on genuinely useful context: a sign-in prerequisite and the exact shape of the returned watch data including plan-tier-dependent channels (webhooks on Team and up). It does not mention pagination or failure modes, but the auth and plan-gating disclosure adds real value.

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 dense sentence that front-loads the auth prerequisite and then the payload contents. Slightly list-heavy but every clause carries information and nothing is redundant.

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 appropriately spells out what a caller receives (watches, usage, digest date, channels) and the account requirement. For a zero-parameter read listing, this is close to complete; only pagination/ordering behavior is left unspecified.

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 tool takes zero parameters, so there is nothing for the description to disambiguate; the baseline for a parameterless tool 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?

The description names the resource ("AI watches") and enumerates what is returned: watch type/id/name, plan usage count, next digest date, and alert channels. This clearly separates it from the mutation siblings watch/unwatch, though the core verb is only implied rather than stated.

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?

Usage context is implied by the surrounding watch/unwatch/listing siblings and by naming the account prerequisite, but the description never states when to call this versus alternatives or any conditions under which it should not be used.

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