Send a test email to the account's own address

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

Beyond the sparse annotations, the description discloses the key behavior: it sends a real message through the relay exactly as application code would, it consumes one address against the daily quota, and it requires the account token. These are important operational details for a tool with openWorldHint=true.

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 front-loaded and every sentence contributes useful information. There is minor redundancy in repeating the account's own address as the recipient, but overall it is efficient.

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 no-parameter, no-output-schema tool with minimal annotations, the description covers the important gaps: real delivery, relay path, fixed recipient, quota consumption, and authentication. An agent has enough to call it correctly and understand the side effects.

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?

There are zero parameters, and the schema confirms an empty object, so the baseline is 4. The description correctly states that the recipient is fixed and not caller-controlled, but no parameter-level detail is needed beyond that.

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?

It states a specific verb and resource: send one real test message to the account's own address through the relay. That is clearly distinguishable from sibling tools such as email_status, email_activity, and email_deliverability, which inspect rather than send.

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 purpose and the intended outcome are explicit: use it so the user can see that email works, and the recipient is always the account's own address. It does not explicitly name alternative email tools or exclusion conditions, but the usage context is clear enough for an agent to choose it over diagnostic siblings.

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