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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description adds useful context in 'when the tour has them' (fields may be absent) and the fact that data is operator-authored policy text, but it discloses no auth, rate-limit, or failure behavior beyond that.

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, front-loaded with the verb and resource, then the returned fields and a scoping caveat. No filler; every clause adds information.

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 an output schema present, the description needn't enumerate return structure, yet it does so helpfully, and it clarifies the tour-scoped (non-booking) semantics. It is complete enough to invoke correctly, with only the parameter's id origin/format left implicit.

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?

Single parameter with 0% schema description coverage, so the description must carry the load. It tells the agent bokun_id identifies 'one TripWays tour,' which is meaningful scoping, but adds nothing about the numeric-string format or where the id comes from.

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 (Get) and resource (cancellation terms stored for one TripWays tour), and enumerates the returned fields (type, refund percent, cutoff, operator policy text). It also draws a boundary against get_price_quote by clarifying these are the tour's stored terms, not a booking-specific quote.

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?

The closing sentence carves out the usage case by contrasting with a booking-specific quote, implicitly steering the agent to get_price_quote for that need. However, it does not name that alternative explicitly or state hard when/when-not conditions, so it stops short of a 5.

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