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

Annotations already declare destructiveHint=true, idempotentHint=true and openWorldHint=false, so the safety profile is covered structurally. The description adds genuinely useful context by naming the `full_access` API key requirement and the underlying `DELETE /domains/{id}` operation, but it says nothing about what happens to associated resources (domains, senders, DNS records) or whether deletion is recoverable.

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?

Three short lines with the action front-loaded and zero filler; the auth and endpoint facts are stated compactly with no repetition of the schema or annotations.

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 destructive, non-reversible operation with no output schema and an undocumented parameter, the description covers auth and the underlying API call but omits consequences (cascading deletions, effect on in-flight sends, error conditions). An agent could invoke it correctly but cannot judge risk from the text alone.

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 0% and the single `id` parameter is undocumented in the schema, so the description carries the burden. It partially compensates by exposing the endpoint `DELETE /domains/{id}`, which implies the id is the domain identifier used in the path, but it never states that explicitly or notes format expectations beyond the uuid type.

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?

The description states a specific verb and resource ("Delete a domain") that maps directly to the tool name and title. It is unambiguous about what the tool does, though it offers no explicit differentiation from sibling mutators such as update_domain or verify_domain.

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?

There is no guidance on when to call this versus alternatives like update_domain or verify_domain, and no warning that deletion is irreversible or when it should be avoided. The only usage-relevant statement is the authentication prerequisite, which is a constraint rather than a use-case rule.

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