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

No annotations are provided, so the description carries the full burden. It provides concrete behavioral details: deletes from both Resend and the database, reverts to the default address, and requires confirm:true. This goes beyond a generic delete description. It does not mention irreversibility or permission requirements, but the information given is solid. Score 4, not 5, because it omits consequences like whether the action is irreversible and potential edge cases (e.g., if the domain is already the default).

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 description is three sentences long, front-loads the action ('Remove...'), and contains no filler. Every sentence earns its place: the first states the core purpose, the second explains the scope of deletion, the third gives the fallback and confirmation requirement. It is appropriately sized for a simple delete tool.

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?

The tool has no output schema and 0% schema description coverage, so the description needs to provide enough context. It explains the main behavioral consequences (dual deletion, fallback) but does not mention return values, error handling (e.g., what happens if domain is not found), or the role of 'apiKey'. While the deletion result is likely a success message, the description could be more complete. Score 3 reflects moderate completeness.

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 description refers to 'confirm: true' and implies that orgSlug identifies the organization, but it does not explain the role of orgSlug in the deletion or what apiKey is used for. With schema description coverage at 0%, the description should have compensated by explaining each parameter. It only partially addresses the required parameter 'confirm', leaving the other two parameters unexplained. This fails to provide sufficient meaning beyond the raw 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?

The description clearly states the tool's purpose: 'Remove the configured email sending domain from the organization.' This is a specific verb (remove) and resource (email domain), and it distinguishes from siblings like email_domain_get, email_domain_register, and email_domain_verify by describing a deletion action. The wording is unambiguous and action-oriented.

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 description implies when to use this tool (to remove an email sending domain) and clarifies the fallback behavior ('revert to using the default Coordinalo sending address'). However, it does not explicitly name alternatives or state when not to use it, so it meets the 'clear context' level but lacks explicit exclusions or alternative mentions.

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