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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds genuine extra context beyond that: the authentication requirement ('Necesita que el cliente haya iniciado sesión') and the fact that the result feeds cancel_booking. It does not, however, discuss pagination or result limits.

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?

It is a single dense, front-loaded sentence that wastes no words and puts the resource and scope first. It is slightly run-on, packing returned fields, the cancel_booking link, and the auth requirement into one clause stack, but every element 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 no output schema, the description usefully enumerates the returned fields (store, day, time slots, tables, booking_id) and the auth prerequisite, which is enough to call a simple one-param read tool correctly. It omits any notion of pagination or result volume, a minor gap for a list-style tool.

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%, so the single 'country' enum parameter is already fully documented in the schema, including the es/fr store mapping and its effect on language and prices. The description adds no parameter-level meaning beyond that, 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?

The description names a specific resource (table reservations at the ludoteca) and scope (those the customer holds from today onwards), plus the fields returned (tienda, día, franjas, mesas, booking_id). It also implicitly distinguishes itself from cancel_booking by referencing the booking_id that sibling consumes, so an agent can tell it apart from book_table and cancel_booking.

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 gives clear context: only reservations 'a partir de hoy' (upcoming, not historical) and a stated prerequisite that the client must be logged in. It also points to cancel_booking as the consumer of the returned booking_id. What it lacks is an explicit when-not or a named alternative to choose instead.

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