Create Mailbox

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

No annotations are present, so the description carries the full burden of behavioral disclosure. It fails to mention whether the email must be unique, what happens if the order_id is invalid, whether a confirmation is sent, or whether the operation is reversible.

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 very short and front-loaded, but it is under-specified rather than concise. It omits necessary behavioral and contextual details that a one-sentence description could include, making it less than appropriately sized for a mutating 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?

Given no annotations or output schema, the context is incomplete. A creation tool should at least mention that it requires an existing mail order and any side effects or return behavior; the description is insufficient for an agent to know when to invoke it safely.

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?

All three parameters (email, order_id, password) are documented in the schema with 100% coverage, so the baseline is 3. The description adds no additional semantics beyond the schema, such as password constraints or how to obtain the order_id.

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 says 'Create a new mailbox,' which is a clear verb+resource but merely restates the tool title and name. It adds no additional information about scope, constraints, or relation to the required order_id.

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?

No guidance is provided on when to use this tool, what prerequisites must exist (e.g., a valid mail order), or which alternative to choose among sibling tools like mail_aliases_create. The intended use is only implied by the verb 'create.'

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