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

The annotation set only declares idempotentHint=true, so safety-on-retry is already covered. The description adds real value beyond that by disclosing the user-visible consequence (emails stop), but says nothing about permanence, permissions, or whether the alert can be restored.

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 sentences with no filler; the action and effect come first, and the id-sourcing hint follows. Every sentence 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 single-parameter, no-output-schema delete tool with an idempotency annotation, the description covers what it does, the effect, and where the id comes from. Only minor gaps remain (permanence/permissions), which are not critical here.

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?

With 1 parameter at 100% schema description coverage, the schema already documents the id and its source. The description's "Get the id from list_alerts" largely restates the schema rather than adding format or constraint detail, 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?

Specific verb ("Delete") plus a precisely scoped resource ("one of the user's want alerts"), with the observable effect stated ("so they stop receiving emails for it"). This clearly separates it from siblings like list_alerts and set_alert.

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 a prerequisite for the required id ("Get the id from list_alerts"), which is useful usage context. However, it never states when to prefer this over alternatives (e.g., close_want vs delete_alert) or any conditions/exclusions for deleting.

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