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

Annotations already say not read-only and potentially destructive. The description adds valuable context beyond annotations: it may execute immediately or file for approval, and the status field tells which. It doesn't mention idempotency (though request_id schema covers that) or email deliverability, so minor room remains to disclose consequences of sending to a real recipient.

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 focused sentences, front-loading the verb, resource, and audience, then adding the approval distinction. Every word earns its place and no fluff.

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 single-email tool with rich schema and multiple sibling email tools, the description is complete enough to invoke correctly. It could state expected sender identity or recipient scope (single contact only) more explicitly, but the single-contact wording already handles recipient scope. No output schema means return values are not specified, but the status field hint compensates partially.

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 100%, so baseline is 3. The description adds context that templateId can be org or event template and that behavior may be queued for approval, but it doesn't add much beyond the schema's detailed parameter descriptions. The schema already documents request_id semantics thoroughly.

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?

States a specific verb+resource: sends a templated email to a single contact. It also differentiates itself from draft_email and send_speaker_message/send_speaker_reminder by emphasizing single-contact templated email behavior. The clarification that it may either execute or file a proposal adds a useful distinctive trait.

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 description implies use for sending a single templated email and the response status field informs which path occurred, but it does not explicitly state when to prefer this over draft_email or send_speaker_message. It provides helpful context about approval workflows but no formal exclusion or alternative guidance.

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