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

Annotations already declare destructiveHint=true, idempotentHint=false, openWorldHint=false, so the mutation profile is known. The description adds genuinely non-structured behavior: required auth context, server-side revalidation of account/organization/revisions, and the stale-preview no-op, which tells the agent the call can silently do nothing.

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?

Roughly seven short sentences with the critical auth/precondition facts front-loaded, but the sentence "A stale preview changes nothing" is repeated verbatim, which is pure waste and suggests the text was assembled without editing.

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 destructive, non-idempotent write with no output schema, the description covers auth, prerequisites, server-side validation, and the dedup cap — enough for an agent to call it correctly. It is slightly silent on the success outcome (what the applied alerts actually produce for the user), but that gap is minor.

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%, so the baseline is 3, and the description adds deduplication semantics not in the schema: repeated registrable domains count once, and selection is capped at 25 saved pages. That extra rule meaningfully changes how the agent constructs the tabs array.

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 ("Apply") on a specific resource (the reviewed domain-alert selection) and clearly positions itself downstream of preview_domain_alerts. It is somewhat abstract about what the end result is (renewal notices at lead_days), but the agent can distinguish it from the sibling preview tool without opening either schema.

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?

Gives a strong precondition ("Requires the preview from preview_domain_alerts") plus the write-auth prerequisites (account session, X-Organization-Id, CSRF), which effectively routes the agent to the preview tool first. It does not state any when-not-to-use case beyond the stale-preview no-op, so it stops short of explicit exclusions.

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