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

With no annotations supplied, the description carries the full disclosure burden and does add real behavior beyond the schema: results are direct children only (not recursive), and the root case additionally returns folders shared by others together with the caller's role. It leaves out ordering, pagination, and permission/error behavior, which keeps it from a 5.

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?

Three short sentences: purpose first, the null/root branch second, and the follow-up handoff last. Every sentence contributes a distinct fact and nothing is repeated.

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 one-optional-parameter read tool with no output schema and no annotations, the definition covers what it returns (direct children vs root folders plus sharedWithMe with role) and how to use the ids downstream. Only secondary details like ordering and pagination are 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 100% and the single parameter already documents 'null/omitir = raíz', so the description's parentId statement largely restates structured data. It does add the consequence of the root case (shared folders appear with a role), which informs how to interpret results, hence above a flat 2 but not a strong 4.

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 and resource ('Lista las subcarpetas directas de una carpeta de tareas recurrentes') and scopes the domain to recurring-task folders, which implicitly separates it from the other *_folders_list siblings. It does not name any sibling explicitly, so the distinction relies on the reader inferring domain from the noun phrase.

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?

Gives clear conditional usage: omit parentId (or pass null) to get root folders instead of children, and it directs the agent downstream by saying the returned ids are used as folderId in tasks_list/tasks_create. It stops short of saying when to prefer this over the sibling folder-listing tools, but the context it does give is actionable.

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