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

Annotations only say it is not read-only and not idempotent; the description explains the actual mechanics: first resend reuses the same link, after opening or expiry the old link is cancelled and a fresh one is issued, and only the newest works. It also discloses a rate limit (three links per booking) and the destination constraint (same number), none of which is in the annotations.

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?

Front-loaded with the trigger, then the escalation rule, then the hard constraint. Four sentences, each carrying information, though 'Vuelo texts it again, to the same number' partially restates the title and could be tighter.

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 one-parameter action tool with no output schema, the description covers trigger, side effects on prior links, and limits. The remaining gap is the meaning of taskId and what the caller sees on success, which the absence of an output schema leaves unaddressed.

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 required parameter taskId has 0% schema description coverage and the description never mentions it, so the agent must guess whether it is a booking id, task id, or traveller id. The phrase 'a booking' hints the identifier is booking-scoped, but that is inference rather than documentation.

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 (texts the Vuelo secure link again) plus the exact scope (same number as before). An agent can immediately distinguish this from send_to_payer, contact_support, or any link-generation step.

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 explicit trigger conditions (traveller reports the link never arrived, or asks for another) and an explicit prohibition that steers away from an alternative action (never paste the link into chat yourself). The three-links-per-booking cap further bounds when this can be used.

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