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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered. The description still adds real behavioral context: the return payload is enumerated field by field, prices are stated as exact, in EUR, including VAT, and the no-dates fallback behavior is disclosed — none of which is derivable from annotations.

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 sentences, front-loaded with purpose and price semantics, then the return contract, then the edge case. No filler and nothing repeated from the schema.

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 does the work of describing returns and covers the date-less case well. The main remaining gap for an 8-parameter tool is that half the occupancy parameters are undocumented anywhere and the description does not compensate.

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 63%, so the schema documents lang, adults, guests and the date patterns, while pets, children_3_6 and children_7_17 carry no descriptions at all. The description only indirectly touches parameters via 'Without dates', leaving the age-split vs. total-guests ambiguity and the pricing effect of pets unexplained.

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 pairing: live availability and exact prices (with currency and VAT treatment) for a stay, plus what is returned per unit. This is far more specific than the sibling names suggest (create_booking_request, get_property_info, list_accommodations), but the description never names a sibling or explicitly distinguishes itself from list_accommodations.

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 by 'for a stay' and by the fallback rule 'Without dates it returns the next free period per unit', which effectively signals the date parameters are optional. However, there is no guidance on which guest-count parameters to supply (guests vs. adults plus the two children buckets plus pets), and no stated when-not or alternative tool.

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