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

The description discloses the key state change that explains the readOnlyHint=false annotation: it 'marks them read'. It also conveys incremental semantics ('since the last check'), which aligns with idempotentHint=true. It does not mention any permission/auth requirement or whether the read-marking is reversible, so it is strong but not exhaustive.

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 with a specific action, scope, and side effect, front-loaded with the return value. Nothing is redundant or padded.

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 parameters, no output schema, and annotations covering the safety profile, the description carries what an agent needs: what is returned, the time window, and the side effect. A brief note on the alert payload or on how it differs from list_alerts would close the remaining gap.

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 the baseline is 4; there is no parameter surface for the description to compensate for.

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 ('Returns this member's alerts that fired') plus scope ('since the last check'), which is concrete enough to act on. However it does not differentiate itself from the sibling list_alerts, so an agent must guess which of the two alert-listing tools fits.

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 phrase 'since the last check' implies the polling/incremental use case, which is useful implied guidance. But it never names list_alerts or states when to prefer one over the other, and gives no prerequisites or exclusions.

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