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

Annotations already declare readOnlyHint=true, openWorldHint=false, and destructiveHint=false, so the safety profile is covered. The description adds genuinely useful context beyond that: results are ordered newest first, and an unread count is returned alongside the list, which is not derivable from the schema or 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?

A single front-loaded sentence with no filler; the parenthetical enumeration is dense but every element carries selection value (categories covered) or behavioral value (ordering, unread count). Nothing could be cut without losing information.

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 read-only list tool with full schema coverage, no output schema, and complete annotations, the description covers scope, ordering, and the unread-count return. It does not address pagination behavior beyond the limit parameter, which is a minor gap in an otherwise sufficient definition.

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 both parameters (limit with default 30/max 100, unreadOnly with default false) are already documented in the schema. The description adds no syntax or behavioral detail about how these parameters interact with the returned unread count, so the baseline 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 and resource ('Lists the user's notifications') and enumerates the notification categories covered (mentions, assignments, comments on watched cards, due-date digests), which lets an agent distinguish it from list_activity and list_reminders. It stops short of explicitly naming those siblings, so it is clear but not fully differentiated.

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 only implied by the enumerated content: an agent can infer this is the tool for viewing personal notifications, and the mention/assignment/comment/digest list implicitly separates it from list_activity. There is no explicit when-to-use, when-not-to-use, or reference to mark_notifications_read for the read/unread workflow.

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