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

Annotations already declare readOnly, idempotent, non-destructive, closed-world, so the safety profile is fully covered. The description adds genuine behavioral value with the 'Unread first' sort order, which is not expressed anywhere in structured data. It stops short of disclosure about result volume, pagination, or whether notice types can be mixed in one response.

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?

Two short, dense sentences with no filler; the scope statement leads and the ordering hint trails. 'From the app's bell' is slightly scenic phrasing, but it usefully anchors the agent to the right UI concept.

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-optional-boolean read tool with a fully annotated safety profile and no output schema, the description does the important work: it tells the agent what kinds of notices come back and how they're ordered. Only pagination or result-size expectations are missing, which is a minor gap at this complexity level.

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% with a single well-described boolean, so the baseline is 3. The description's 'Unread first' adds a small nuance about default ordering relative to the unread filter, but it does not clarify whether the flag reorders or restricts results, leaving a minor ambiguity.

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 the resource (notifications from the app's bell) and enumerates the concrete notice types returned: published, failed, retrying, recovered posts plus accounts at risk of losing sign-in. The 'list' verb is implicit from the name but the scope is unmistakable, and no sibling tool overlaps with this resource, so differentiation is not a concern.

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 is implied rather than stated: an agent can infer this is the tool for surfacing alerts or account health issues, and 'Unread first' hints at the default ordering. There is no explicit when-to-use, when-not-to-use, or alternative named, but since no sibling tool covers notifications, the risk of misselection is low.

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