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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds genuine resource semantics — alerts are polled every few minutes and fire on a condition — which tells the agent the data is periodically refreshed rather than real-time. It says nothing about ordering, result size, or pagination, so it is useful but incomplete beyond the 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 sentence with zero filler; the resource definition comes first and the returned fields are compressed into one clause. The heavy parenthetical slightly hinders scanning but nothing is wasted.

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 zero-parameter, read-only list tool with no output schema, the field enumeration usefully stands in for return-value documentation. However, with ~70 siblings and two confusable alert tools, the absence of any disambiguation leaves a meaningful gap for selection.

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 no parameters, so the baseline of 4 applies. The description does not need to explain inputs, and the returned-field list is a bonus rather than a parameter explanation.

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 precisely ('your data alerts') and defines what an alert is in this product, plus enumerates the returned fields (id, name, active/paused, frequency, last check). It never says 'list' explicitly, but the field enumeration makes the retrieval intent unmistakable. It does not differentiate itself from the sibling tools list_activity_alerts and list_activity_alert_rules, which is a real ambiguity given the crowded namespace.

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?

There is no when-to-use guidance, no prerequisites, and no mention of alternatives — despite two similarly named alert-listing tools in the sibling set. The definition of 'alert' implicitly signals context, but the agent gets no help deciding between this and list_activity_alerts.

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