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

Annotations already declare readOnlyHint=false, destructiveHint=false, and idempotentHint=false, so the safety profile is partly covered. However, the description adds nothing beyond the title: it doesn't say what happens if the mailbox is already active, whether reactivation is reversible, or how the non-idempotent behavior manifests. For a state-mutating tool this is thin.

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 the operation and target front-loaded and no wasted clauses. It is efficient, though it is nearly a restatement of the title, so it earns less than full marks.

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 not be described. Still, for a non-idempotent state mutation the description leaves gaps around repeat-call behavior and the expiresIn effect, which an agent would want before invoking.

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 100% and the schema documents both mailboxId and expiresIn (including the 1-60 minute range), so the baseline of 3 applies. The description adds no extra meaning about the optional expiresIn lifetime or what happens when it is omitted.

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 (reactivate) and resource (archived mailbox) plus the resulting state, which clearly separates it from siblings like archived.delete, archived.get, and archived.list. It does not name any sibling explicitly, so it falls short of the 5-level differentiation bar.

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 no when-to-use context, no prerequisites (e.g., mailbox must already be archived), and no alternatives such as archived.delete for permanent removal. An agent must infer all routing decisions from the name alone.

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