sendSimpleMail

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

No annotations, so the description carries the full burden. It doesn't state whether this requires authenticated SMTP configuration, what happens on failure, whether a copy is saved to Sent, or any rate limits. For a side-effectful send operation, this is a significant gap.

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?

Two short sentences, front-loaded with the primary action and scope. No 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?

For a mutation tool with no annotations, no output schema, and 0% parameter documentation, the description is too thin. It doesn't compensate for missing schema descriptions or explain the behavior relative to its many siblings.

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% – the three required params (to, subject, body) have no descriptions in the schema. The description adds no format details (e.g., whether 'to' accepts a display name, comma-separated lists, or whether body supports plain-text only). It says 'text email' but doesn't clarify plain vs. rich text. Must compensate but doesn't.

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?

Clear verb+resource+scope: 'Send a simple text email to a single recipient.' Distinguishes itself from sendBulkMail/sendHtmlMail via 'single recipient' and 'text'. However, it doesn't explicitly reference the sibling sendMail it is a 'simplified version' of, leaving the exact delta (attachments? cc? html?) ambiguous.

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?

Implies usage via 'quick, basic email sending' but no explicit when-to-use/when-not. The agent could reasonably pick sendMail or sendHtmlMail under the same conditions. No exclusions or prerequisites stated.

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