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

Annotations already declare readOnly/openWorld/non-destructive, so safety is covered. The description adds genuinely useful context beyond them: that personal data is returned as the provider panel shows it and is not stored by Cotlet, plus the auth requirement (Cotlet API key with app access). This is real behavioral value.

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 opening clause and the second sentence list the same six fields twice ('reference, activity, date and time, people, price and lead traveler contact' vs 'reference, activity, date and time, number of people, price and the lead traveler contact'), which is redundant padding. The auth/data-handling note is useful but the field list should appear once.

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 usefully enumerates the returned fields and discloses the auth requirement and personal-data handling, which is enough for an agent to call it correctly. Adding a pointer to list_bookings for discovering booking IDs would make it complete.

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 booking_id parameter is already documented ('Booking ID from list_bookings'), so the schema does the heavy lifting. The description's field enumeration describes the return payload, not the parameter, so it adds no parameter-level meaning. Baseline 3 is appropriate.

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 ('One booking') and enumerates the fields returned (reference, activity, date/time, people, price, lead traveler). It's clearly a single-record fetch and implicitly contrasts with the list tools via 'One booking', though it doesn't name civitatis_list_bookings as the alternative.

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?

There is no explicit when-to-use guidance or reference to sibling tools. The only routing hint ('Booking ID from list_bookings') lives in the schema parameter, not the description, and no condition for choosing this over list_bookings or other booking tools is given.

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