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

Annotations already declare it non-destructive, idempotent, and open-world, so the safety profile is covered externally. The description adds that it triggers a DNS check and returns status, consistent with openWorldHint, but omits whether verification is async, how long DNS propagation failure looks, or whether the status can lag.

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 short sentences, action first and return value second, with zero filler. Nothing could be removed without losing 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?

For a one-parameter trigger tool this is close to adequate, and the description does state what comes back despite no output schema. It still lacks the status values returned and whether the call blocks until verification completes, which matters because DNS checks are asynchronous.

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 coverage is 100% and includes an example format, so the schema carries parameter meaning. The description adds only the implicit constraint that the domain should be pending; no extra syntax or formatting detail beyond the schema.

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?

Names a specific verb and resource: 'Trigger DNS verification for a pending domain', plus the return content. It scopes to 'pending' domains, which distinguishes it from activate_domain and check_domain_availability, though neither sibling is named explicitly.

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?

'Pending domain' implies the precondition that the domain must already be added but unverified, which is useful implied guidance. However, there is no explicit statement of when to call this versus check_domain_availability or activate_domain, nor what to do after the trigger.

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