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

Annotations already declare readOnlyHint=true, destructiveHint=false, openWorldHint=false, so the safety profile is covered. The description adds a useful behavioral detail (returns null when no domain is set, idempotent, reads current server state) but the canonicality/idempotency/confirmation sentences read as generic boilerplate rather than tool-specific disclosure.

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 and the null-return note is valuable, but the Canonicality/Idempotency/Confirmation-boundary block is generic policy text that consumes most of the description without adding tool-specific meaning.

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 does sketch the return contents (state, sender, DNS findings, records), which helps. But it omits the sibling differentiation an agent needs to pick this tool and leaves the sole input parameter unexplained.

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?

The one parameter (_corply_context with nested id/receipt) has 0% schema description coverage and is never mentioned in the description, so nothing compensates for the gap. The nested context object's purpose and the required id/receipt relationship are left entirely undocumented.

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: reading the company's email-domain state, sender, DNS findings and records. This is clear and concrete, but it makes no attempt to distinguish itself from the near-identical siblings check_email_domain and inspect_email_domain, which an agent will have to disambiguate on its own.

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?

Gives a prerequisite (authenticated active company access) and a confirmation-boundary statement saying no extra confirmation is needed for this read. However, it never says when to choose this over check_email_domain or inspect_email_domain, so the usage context is only implied.

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