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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world, so safety is covered. The description adds one useful behavioral detail — counts are of *published* activities, implying unpublished/zero-activity options may be absent — but says nothing about result size, ordering, or how the two lists are shaped.

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 sentence with zero filler, front-loading what is returned and ending with the sibling it pairs with. Nothing to trim.

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 and 0% parameter documentation, the description should say more about the response shape (are results grouped, keyed by slug, sorted by count?) and what the limits do. It covers purpose and pairing well but leaves the return contract thin.

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% and the description never mentions categories_limit or destinations_limit. The only hint is the implicit 'counts/limits' framing; the agent gets no explanation of what these caps truncate or whether hitting them silently drops options.

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 (list) and precisely names the two resources returned: destination (country) slugs and category slugs, plus activity counts. This is clearly distinguishable from get_adventure, list_rankings, and search_adventures.

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?

"for use with search_adventures" explicitly routes the agent: this tool is the enumeration step that supplies valid slugs to the search tool. It stops short of stating when not to use it or whether calling search_adventures with free text is a valid alternative.

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