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

Annotations only say readOnlyHint=false and destructiveHint=false, so the description adds real value by disclosing the authentication prerequisite and the fact that this is an action that kicks off a verification process. It does not disclose idempotency, rate limits, or whether the operation is asynchronous and needs polling, which would be the next useful layer.

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?

The purpose is front-loaded in the first sentence and the access prerequisite follows in a compact, clearly separated block. Slightly more verbose than strictly needed, but every sentence carries information and nothing is padded.

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, no-output-schema tool the description covers purpose and auth adequately, but it omits the obvious follow-up context in a crowded verification toolset: whether calling this is synchronous, and whether the agent should subsequently call check_domain_verification/check_domain_email_status to observe the result. That gap matters given the sibling list.

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?

There is a single required parameter (id: Domain ID to verify) with 100% schema description coverage, so the schema fully documents it. The description adds no format, syntax, or sourcing detail (e.g., where to obtain the domain ID) beyond what the schema already says, so baseline 3 applies.

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 and resource (trigger domain verification) and clarifies the mechanism (DNS records or other method) plus the goal (confirm ownership). However, it does not distinguish itself from close siblings like start_domain_verification, check_domain_verification, or verify_domain_with_credentials, so an agent cannot tell the trigger apart from the check or the credential path without opening schemas.

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 ACCESS block is genuine operational guidance: it names the required Proof account and gives two concrete ways to satisfy authentication (/mcp authenticate or start_login). But there is no when-to-use guidance relative to the many sibling verification tools (start_* vs check_* vs verify_domain_with_credentials), so selection guidance is only implied.

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