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

Annotations already establish this is a non-read-only, non-destructive, closed-world operation; the description adds genuinely new behavioral facts: the credential is single-use, expires in 15 minutes, and does not itself claim tickets. Those constraints materially change how an agent should sequence calls.

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?

Three short sentences, front-loaded with the core action and the input source, then the lifetime constraint, then the scope limit. No redundant restatement of the title or name.

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?

Output schema exists, so return values need no explanation, and for a one-parameter mutation the description covers origin, lifetime, and scope well. It could still say what a failed or expired confirmation looks like, which matters for a single-use token.

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 single 'code' parameter has 0% schema description coverage, so the description must compensate — and it does, explaining that either the full confirmation link or just its token= value is accepted. It does not describe error behavior for an expired or already-used code, leaving a small gap.

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 and resource — confirming that the fan owns the inbox the ticket was sent to — and ties the input to the sibling that produces it (request_inbox_check). An agent can distinguish this from claim_tickets and request_inbox_check without opening any schema.

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?

Gives clear context: use the link or token= value from the confirmation email, one use, 15-minute window. It implicitly excludes ticket claiming ('Does not claim tickets by itself') but does not name claim_tickets as the follow-on tool, so the routing is implied rather than explicit.

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