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

Annotations already declare readOnly/idempotent/non-destructive, so the trailing 'Read-only.' is redundant. What earns credit is the substantive disclosure about the response itself: the duration vs fromHotelAndBack distinction, the Full day/Half day convention, that price is an exact total for a party size, and that the earliest bookable date is included.

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?

A single dense sentence leads with the core purpose and enumerates the return contents, followed by a short clarifying clause. It is front-loaded and mostly waste-free, though the trailing 'Read-only.' adds nothing given the annotations.

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 carries the burden of describing the returned data and does so field by field, while the annotations cover the safety profile. Nothing essential for correct invocation appears missing.

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 already 100%, but the description adds real meaning: it clarifies that pricing depends on party size ('the exact total for a party size') and explains the vehicle/time semantics surrounding fromHotelAndBack and duration, which the two schema fields alone do not convey.

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 ('Details for one tour') and enumerates exactly what is returned: inclusions, ages, fitness, what to bring, duration, price total, and earliest bookable date. This clearly separates it from list_tours (enumeration) and start_tour_booking (mutation).

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 — an agent can infer this is the detail/price lookup for a single tour, and the schema points back to list_tours for the identifier. However, the description never explicitly says when to use it versus alternatives (e.g., list_tours, start_tour_booking) or states any prerequisite.

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