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

Annotations supply the safety profile (readOnlyHint=false, destructiveHint=false, openWorldHint=true), and the description usefully adds that the save is reversible, that no confirmation is required, and how to handle retries/idempotency and the returned actual_tool_output. It adds real substance beyond structured fields, though 'every prerequisite stated above' is unverifiable filler.

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?

Purpose is front-loaded, but the body is padded with boilerplate labeled sections (Canonicality, Confirmation boundary) and a vacuous 'every prerequisite stated above' clause. The idempotency guidance earns its place; the rest is generic policy text that dilutes the useful signal.

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?

With no output schema, the description covers what an agent needs operationally for an open-world, state-touching read – prerequisites, retry behavior, and the fact that the save is reversible and confirmation-free. The only gap is routing versus sibling inspection tools and the undocumented _corply_context object.

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 50%: the domain param's flexible-input note ('an address on it, or its website URL') lives in the schema, and _corply_context is undocumented in both schema and description. The description contributes no parameter meaning and does not compensate for the uncovered nested context object.

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+resource ('Read and save the public DNS state of a domain') and constrains scope with 'without registering or changing it,' which implicitly rules out connect/register siblings. It doesn't name the closest alternatives (check_email_domain, get_email_domain), so an agent must still infer which inspection tool to 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?

The only usage context is 'authenticated active company access plus every prerequisite stated above' – a prerequisite pointer to text that isn't present here. There is no statement of when to choose this over check_email_domain or get_email_domain, no exclusions, and no scenario guidance.

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