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

Annotations already declare readOnly/idempotent/non-destructive/closed-world, so the bar is lower; the description still adds real value by stating "Nothing is booked or paid" and describing what the traveller does with the link afterward. It stops short of saying what is returned (a URL string) or whether links expire.

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, no filler. The output artifact and the no-charge guarantee are both front-loaded where an agent will read them before committing.

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?

Rich annotations and a well-described 19-param schema cover most of the burden, but with no output schema the description should say the result is a shareable URL and whether it is reusable — that is the one thing an agent must know to relay it to a traveller.

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?

With 89% schema coverage the schema does most of the work, but the description usefully groups the 19 parameters into three buckets — trip, passengers, and "any traveller details known" — conveying that optional fields may be omitted and completed later. That partial-fill semantics is meaningfully above baseline.

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 concrete verb and artifact — "Make a myboracayguide.com link that opens the transfer booking form already filled in" — which is unambiguous and clearly distinct from the sibling create_boracay_activity_booking_link. Scope (transfer booking form) and prefill behavior are both named up front.

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 second sentence establishes the scenario (traveller completes and pays on the site), so usage is implied rather than stated. It never says when to prefer this over routing through list_boracay_airport_transfers or quote_boracay_airport_transfer first, nor when a link is inappropriate.

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