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

readOnlyHint=true already tells the agent this is a safe read, so the bar is lower. The description adds the useful structural fact that the response is a two-level hierarchy of resource types containing resources, plus the underlying endpoint (GET /settings/resources). It says nothing about pagination behavior or result volume, which the schema partially covers.

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 tight sentences with the core purpose front-loaded and the API endpoint as a compact trailing reference. No filler, no repetition of the title.

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?

For a simple paginated read tool with readOnlyHint and a fully documented schema, this covers what the tool returns and how it maps to the API. Only minor gaps remain, such as whether pagination is likely needed or how many resource types typically exist.

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 pageNumber, itemsPerPage, and pageNavigationToken are already fully documented with ranges and usage notes. The description adds no parameter meaning beyond that, making the baseline 3 correct.

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: listing resource types and their constituent resources (guides, instructors, rooms, boats) with ids. The examples make the domain concrete and distinguish it from sibling list tools like bookeo_list_people_categories or bookeo_list_products. It stops short of explicitly contrasting with those siblings, but the resource is clearly named.

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?

No when-to-use guidance, no conditions, and no mention of the sibling list tools an agent might confuse this with (people categories, products). The implied usage of a list endpoint is inferable, but the description offers no routing help.

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