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

Annotations already declare destructiveHint=true and readOnlyHint=false, so the safety profile is covered structurally. The description does add one non-obvious fact beyond annotations: the deletion cascades to the inbox's mail. It says nothing about irreversibility, required permissions, or what happens to existing agents/mailboxes bound to the inbox.

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?

A single front-loaded sentence with no filler, and the cascade scope is stated up front. It is efficient but the brevity comes at the cost of missing operational detail rather than being optimally sized.

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?

Placeholder check: re-evaluating, this is a destructive tool with no output schema and no description of return values, permission requirements, or recoverability. Given annotations only cover the destructive flag, the description is under-specified for a three-parameter irreversible operation.

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 67%: orgId and domainId carry provenance hints (from org_list / domain_list), but the required agentId has no description anywhere. The description mentions no parameters at all, so it fails to compensate for the documented gap.

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 and resource ("Removes an inbox and its mail") and scopes it to a domain, which is more precise than the title alone. It does not differentiate from adjacent siblings such as mailbox_delete or domain_detach, so an agent must infer which deletion surface applies.

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 use this versus mailbox_delete or domain_detach, no prerequisites, and no warning about when not to call it. The agent must infer selection purely from the name.

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