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

No annotations are provided, so the description carries the full behavioral burden. It discloses the ordering guarantee (newest first), the pagination contract, and the categories of items returned, which is genuinely useful, but it never states that this is a read-only, scoped-to-authenticated-user operation or whether the 'api_key' fallback affects behavior.

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 tight sentences, zero filler, with the resource identity and sort order front-loaded before the pagination instruction. Every clause earns its place.

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 simple five-parameter, zero-required read tool with no output schema, the description covers purpose, ordering, and pagination adequately. It is slightly thin on what a returned notification object looks like and on auth expectations, but the api_key parameter description supplies the scope requirement, so nothing critical is missing.

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%, so every parameter (limit, cursor, category, unread_only, deprecated api_key) is already documented in the schema. The description only reinforces the cursor pagination contract and adds no syntax, format, or edge-case detail beyond what the schema provides — the correct baseline of 3.

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 resource ('notifications'), ownership scope ('your own'), sort order ('newest first'), and enumerates the content types surfaced. It is unambiguous what the tool returns, though it does not explicitly contrast with any sibling (none of the listed siblings are notification readers, so no differentiation is needed).

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 gives one procedural hint — 'Paginate with the returned cursor' — which tells the agent how to page but not when to reach for this tool versus anything else, nor any prerequisites (auth scope, rate limits). Usage is implied rather than stated.

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