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

Annotations already declare readOnlyHint=false and destructiveHint=false (a non-read, non-destructive action), so the safety profile is covered. The description adds real value beyond that: the Proof-account requirement, the /mcp authentication flow, and the specific quirk that start_login will not unblock this tool.

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 sentences that are front-loaded with the action and then the access caveat; every sentence earns its place. Slightly verbose in the parenthetical auth instructions but no filler.

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?

No output schema exists, so the description could reasonably say more about what the check returns or whether repeated triggering is idempotent. It covers purpose, precondition, and auth, but leaves an agent guessing how this differs from the cluster of sibling verification tools.

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 there is only one parameter (id, 'Verification ID'), so the schema carries the semantics. The description adds nothing about the id (e.g., where it comes from or accepted format), making the baseline 3 appropriate.

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 (trigger) and resource (DNS/HTTP verification check) plus the precondition that the verification is pending. It does not differentiate from the many near-identical siblings such as check_domain_verification, verify_domain, start_domain_verification, or verify_domain_with_credentials, so an agent cannot tell which of these to pick from the text alone.

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 phrase 'for a pending domain verification' implies the precondition for use, and the ACCESS block explains the account/authentication prerequisite plus the notable exclusion that start_login does NOT open this tool. However, no alternative sibling is named and no explicit when-not guidance is given.

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