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

Annotations already declare destructiveHint=true, idempotentHint=true, readOnlyHint=false and openWorldHint=false, so the safety profile is covered. The description adds scope ('all' updates) and the token's provenance, but says nothing about reversibility, whether the token is single-use, or whether the user can resubscribe afterward.

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, front-loading the credential requirement before the effect. Every clause carries information.

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?

An output schema exists, so return values need no explanation, and the token source is given. Still missing for a destructive, no-undo-implied operation: whether the unsubscribe is permanent, and any mention of the idempotencyKey parameter.

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 0%, so the description must carry parameter meaning: it does explain that the token is opaque and originates from an update email, which the bare minLength/maxLength schema does not. The second parameter, idempotencyKey, is never mentioned, leaving half the surface undocumented.

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+resource effect ('stop all availability updates') and the credential needed ('opaque unsubscribe token'), which clearly separates it from waitlist.subscribe and waitlist.preferences.update. It does not explicitly name those siblings as alternatives, so it stops short of a 5.

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 implies when to use it by naming the token source ('from an elron club update email'), which is a real prerequisite. However, it never contrasts with waitlist.preferences.update (partial opt-out) or states what to do when no token is available, so usage is only implied.

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