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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so safety is covered. The description adds genuinely useful behavioral context beyond that: missing operator fields are omitted rather than returned empty, and a note is emitted when nothing is stored. That is real output-shape disclosure an agent would not otherwise know.

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?

The primary purpose and identifier are front-loaded in the first clause, and the second sentence covers output behavior without padding. The field enumeration is dense but each item maps to a real returned value, so little is wasted.

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 need not document return structure, yet it still summarizes returned content and missing-field handling. For a single-parameter read tool with full annotation coverage, nothing an agent needs to call it correctly is absent.

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 0%, so the description must carry the meaning of bokun_id; it does add that the id refers to a TripWays tour, which is more than the schema's bare pattern constraint says. But it gives no format or sourcing hint (e.g., numeric string, obtainable from search results), so it only partially compensates.

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?

Names a specific verb and resource ('Get where one TripWays tour starts') and enumerates exactly what is returned: meeting point text, hotel pickup availability, know-before-you-go notes, and what to bring. That enumeration clearly carves out a niche distinct from get_tour_details or get_itinerary_ideas without needing to name them.

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 phrase 'by bokun_id' implies the prerequisite (you need a tour identifier, presumably from search_tours or get_tour_details), so usage is inferable. However, there is no explicit when-to-use statement, no guidance on when get_tour_details would be the better call, and no exclusion conditions.

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