send_email

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only restates the action 'Send an email' and reveals nothing about side effects, delivery guarantees, failure modes, authentication requirements, or whether sending is synchronous or asynchronous. This is effectively no behavioral transparency.

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 short and front-loaded, but it is under-specified rather than concise. It omits essential context that an agent needs, and several additional sentences of useful guidance could be added without hurting clarity.

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 tool with 10 parameters, 5 required, and a sibling variant for attachments, a one-sentence description is drastically incomplete. Even though an output schema exists, the lack of parameter semantics, usage guidance, and behavioral detail leaves the agent unable to invoke the tool correctly.

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 description mentions none of the 10 parameters. Required fields like account_id, from_address, to_address, subject, and content are explained only by their titles, while optional parameters such as encoding, ask_receipt, and mail_format receive no semantic clarification at all.

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 clear verb and resource: 'Send an email.' This makes the basic action understandable without referencing the name. However, it does not differentiate from the sibling tool send_email_with_attachments or other email-related operations, leaving the agent to rely on the tool name for distinction.

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 about when to use this tool versus alternatives such as send_email_with_attachments, list_emails, or search_emails. There are no prerequisites, caveats, or exclusions mentioned, so the agent gets no help choosing this tool over similar options.

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