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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile and live-data nature are covered structurally. The description adds the ID-origin caveat, which is useful, but says nothing about freshness/latency of pricing, rate limits, or how availability is expressed. With annotations carrying the safety burden, this is adequate but not rich.

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?

Two sentences, zero waste. Purpose is front-loaded, then the highest-risk pitfall (wrong ID) and the routing to sibling tools follow in order of importance.

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?

An output schema exists, so return values need not be explained, and annotations cover safety. The description supplies purpose, the ID precondition, and sibling routing — everything needed to call this correctly given the surrounding structured data.

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 description coverage is 100%, so all six parameters (dates, adults, locale, currency, property_id) are already documented. The description's note about the global vs legacy ID duplicates the schema's own property_id description, adding no new semantic detail. 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 (Fetch) and resource (rates and availability) scoped to one property and explicit check-in/check-out dates. It is immediately distinguishable from hotels_search (discovery) and hotels_property (static details), both of which it names.

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?

Explicitly prescribes the workflow: use hotels_search to find properties, then this tool for rates/availability, and hotels_property for static details. It also states the precondition for the ID (global properties[].id, not the legacy /ho<id>/ URL ID), which is exactly the guidance an agent needs before invoking.

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