How the application's email stands

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

Annotations already declare readOnlyHint=true and openWorldHint=false, and the description adds meaningful behavioral details beyond them: it reports the last 24 hours and 14 days, includes pausedBy/pausedReason, describes health, and explicitly says it never returns the token. That security and return-scope context is valuable and consistent with the annotations.

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 with the core status information and every clause carries substantive meaning. The first sentence is long and somewhat run-on, but it is not padded with vague filler.

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?

With no input parameters and no output schema, the description carries the burden of explaining what the tool returns. It enumerates the key result areas: send capability, sender address, allowance, 24-hour activity, pause state with pausedBy/pausedReason, 14-day history, last-send timing, and health. That is complete enough for an agent to understand and use the status tool.

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 tool takes zero parameters, so the baseline is 4. There are no parameter semantics to explain, and the description does not need to compensate for a parameter 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 states a clear read-only purpose: reporting whether the application can send email, from which address, allowances, recent sends, pause state, and deliverability health. It is specific about the resource and returned concepts. It does not explicitly distinguish itself from nearby siblings such as email_overview, email_activity, or email_deliverability, so sibling differentiation is missing.

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?

It gives clear usage context: 'Read it before telling the user whether email works.' This tells an agent when to call it. It does not name alternatives or state when not to use it, so it falls short of a 5.

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