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

Goes well beyond the annotations: discloses that the address receives no mail until confirmation, that the code is delivered to an external mailbox the assistant cannot read and must be dictated by a human, and that attempts are limited (hence resend). These are real operational constraints (rate limits, human-in-the-loop, external dependency) that annotations alone do not convey.

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?

Purpose is front-loaded in the first sentence and the following sentences each add substantive context (dependency, human step, attempt limit). Slightly dense but every sentence earns its place; 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?

No output schema exists, so the description carries the explanatory burden for a non-idempotent, open-world mutation tool. It covers the key behavior (confirmation gating, code source, resend), but does not describe what a successful confirmation returns or what state changes afterward.

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 coverage is 100%, so the baseline is 3. The description adds meaning beyond the schema by telling the agent where confirmation_code comes from (the email, dictated by the person) and why the resend path exists, which helps invoke the tool correctly.

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 (подтверждает адрес получателя копий ответов) and adds the second capability (повторная отправка кода), so the agent knows this tool both confirms and resends. It explicitly distinguishes itself from the sibling add_quiz_email_recipient by noting that one only registers the address.

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?

Explains the condition that makes this tool necessary: until confirmed the address receives no email at all, and add_quiz_email_recipient merely creates it. The triggers for each mode (confirm vs resend) are implied by the code and attempt-limit context. No explicit when-not guidance, so not a 5.

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