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

Annotations declare non-read-only, non-destructive, closed-world, so the description's job is to say what actually changes: an email is dispatched to the address each ticket email was previously sent to, and the masked recipient is returned. That is useful side-effect disclosure beyond the annotations, though it says nothing about idempotency, rate limits, or error behavior.

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 sentences, front-loaded with the action and followed immediately by the required next step. No filler or restated title.

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 an output schema present and no inputs, the definition covers what an agent most needs: the side effect, the masked return, and the hand-off to confirm_inbox. Only failure and re-send scenarios are unaddressed, which is a minor gap at this complexity.

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. The description still adds meaningful implicit-input context by noting that the target messages and destination addresses come from prior submissions rather than from arguments.

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 (sends the inbox-proof confirmation email) and scopes it to 'submitted messages that need it' rather than the whole mailbox. It is clearly distinguishable from siblings like confirm_inbox, though the phrase 'that need it' leaves the exact selection criteria implicit.

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 makes the workflow position explicit: call this first, then read the email in the fan's inbox and pass its link or token to confirm_inbox. That is clear chaining guidance, but there is no statement of when not to call it (e.g. if a confirmation was already sent) or what to do on failure.

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