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

Annotations already declare readOnlyHint/destructiveHint/openWorld, so safety is covered. The description adds a genuine behavioral fact beyond annotations: it requires the user's Cotlet API key with access to this app, an auth precondition the agent needs to know. It also describes the response shape, which matters since no output schema exists.

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 field list is stated twice ('reference, option, date and time, participants by category, price and lead traveler' then again as 'the option, date, start time, travelers per category, the price and the lead traveler's name and language'), which is redundant and inflates the text. The auth note at the end is a useful addition but the duplication costs clarity.

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 no output schema, the description appropriately documents what the return contains (option, date, start time, travelers per category, price, lead traveler name/language) and the auth requirement. For a single-required-param read tool this is largely complete, missing only explicit usage conditions.

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 coverage is 100% and the single parameter is documented in the schema, so baseline is 3. The description adds only the source of the reference ('on the booking in list_bookings'), not additional format or syntax detail.

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+resource ('Get...One booking') and enumerates the returned fields, so an agent knows it fetches a single booking by reference. It also references the sibling list_bookings as the source of the reference, giving some differentiation, though without an explicit 'not the list tool' framing.

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?

It implies the prerequisite that the reference comes from list_bookings, which is useful routing context. However, it never states when to use this tool versus alternatives (e.g., list_bookings, get_availability) or any conditions/exclusions explicitly.

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