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

With no annotations provided, the description carries the full burden and does disclose meaningful behavioral context: the call is a trigger with a sequencing dependency (must follow DNS/HTTP setup) and requires prior authentication, including a retry path. However, it doesn't disclose what happens on failure, whether the check is synchronous or asynchronous, or what a successful check returns, leaving the agent guessing about response semantics.

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 and call timing are front-loaded in the first two sentences, and the access note is actionable. The middle section is slightly verbose with the parenthetical Claude Code path, but every sentence earns its place and the overall length is appropriate.

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 1-param tool this is operationally close to complete: it covers what the tool does, when to call it, and how to authenticate. It falls short on return-value behavior (no output schema exists to compensate) and on differentiating from the similar siblings check_domain_verification and get_user_domain_verification_status, leaving an agent without enough information to fully interpret the result.

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 single session_id parameter is already described as 'Domain verification session ID'. The description adds no additional parameter-level meaning beyond what the schema provides, which is acceptable at the high-coverage baseline.

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 action ('Trigger a check') on a specific resource ('domain verification challenge') and gives the triggering condition (after placing DNS record or HTTP file). It stops short of 5 because it doesn't distinguish itself from the near-identical sibling check_domain_verification, leaving an agent to wonder which of the two it should pick.

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?

Explicitly states when to call ('Call after placing DNS record or HTTP file') and provides a detailed authentication prerequisite with a practical retry flow (start_login opens the tool, then call again). It doesn't name alternatives or state when not to use this tool versus check_domain_verification or get_user_domain_verification_status, but the timing and auth guidance are concrete and actionable.

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