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

Annotations already declare destructiveHint=true and readOnlyHint=false, so the safety profile is covered. The description adds useful specifics beyond the annotations — it clarifies that the stored address is deleted, not merely notifications muted — but says nothing about reversibility, whether the address must be re-set for future notifications, or any confirmation 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?

A single short sentence with no filler, and the action is front-loaded. It is efficient, though the dual effect (stop + delete) in one clause is slightly compact.

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 one-parameter destructive tool with no output schema and full annotation coverage, the description covers the essential effect. It is still missing the when-to-use hook and any recovery/confirmation note that an agent managing notifications would want.

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?

Only one parameter (api_token) and schema description coverage is 100%, so the schema already carries the full burden of explaining it. The description adds no parameter detail, which is acceptable at full coverage — baseline 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 verb pair (stop, delete) and resource (the email address hashn holds), which distinguishes it from set_notification_email and confirm_notification_email. It stops short of naming those siblings, so an agent must infer that this is the removal counterpart to the set/confirm pair.

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?

No guidance on when to use this versus set_notification_email, confirm_notification_email, or notification_status, and no stated prerequisites (e.g. whether a registered address must exist first). The agent must infer usage from the verb alone.

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