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

Annotations already declare readOnlyHint=true, idempotentHint=true, and openWorldHint=false, but the description adds genuinely useful context: the tool produces a link, the customer completes contact details and payment off-tool, and nothing is booked or charged. It does not say whether the link expires or can be reused, which is the remaining behavioral gap.

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 with no waste. The core action is front-loaded, and the follow-up sentences explain the handoff and the no-charge guarantee. Every sentence earns its place.

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 eight parameters, full schema coverage, no output schema, and annotations covering safety, the description is nearly complete for the agent's needs. It conveys what is produced (a link) but does not state the response shape explicitly, which would have been helpful given the absence of an output schema.

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?

Schema description coverage is 100%, so every one of the eight parameters is already documented with examples and ranges. The description adds no parameter-level meaning beyond describing the overall trip-review flow; baseline 3 is appropriate when the schema does the heavy lifting.

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?

The description gives a specific verb and resource: create a prefilled seatac.co reservation link. It is clearly not a booking or payment tool, which distinguishes it from a charging action. It does not name any sibling tool (quote_ride, get_service_info) as the alternative for pricing or vehicle selection, so sibling differentiation is only 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?

Usage is implied rather than stated: the agent can infer this is the step where the customer is handed off to seatac.co to review and pay. There is no explicit 'use this after quote_ride' or 'do not use this to obtain prices' guidance, and no mention of when to prefer it over the sibling tools.

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