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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the 'creates no booking/hold/payment, modifies or cancels nothing' clauses largely restate structured data. The description does add genuinely new behavior: no traveler details are transmitted to SkyAccess and no specialist is contacted, which annotations cannot express.

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?

The core action is front-loaded in the first clause, followed by a compact list of exclusions. It is appropriately sized, though the no-booking/no-modification clauses partially duplicate the annotation hints and could be trimmed.

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 single-parameter, read-only link retriever with no output schema, the description supplies enough: what the link is, where it leads, and that nothing is mutated or shared. Missing only an explicit note on link validity/expiry, which is minor here.

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?

Only one parameter with 100% schema description coverage, so the schema already fully documents flightId including its origin ('as given in the flightId field of a flight listing'). The description adds no syntax or format detail, so the baseline 3 applies.

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: 'Return the public SkyAccess listing page link for a specific empty leg flight.' It also draws the boundary against 'request_booking' by clarifying no booking/hold/payment is created, though it never names a sibling directly.

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 gives clear context (traveler reviews the flight and continues on skyaccess.com) and negative boundaries (no booking, no hold, no specialist contact), which implicitly routes away from request_booking. However, it never explicitly says when to choose this over search_empty_legs or request_booking, leaving selection to inference.

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