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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is covered. The description adds useful behavioral context: it is account-scoped and returns id, name, type, and size. It does not describe pagination behavior or total counts, but the schema covers limit/offset.

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 compact sentences with no filler; the purpose, returned fields, and downstream use case are front-loaded. Every sentence earns its place.

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, the description compensates by listing the returned fields and citing the endpoint. Pagination details live in the schema, so the definition is nearly complete. The only minor gap is that it does not state whether results are ordered or whether folders can be nested.

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 75%, so the schema already documents limit, offset, and type. The description adds meaning by clarifying that both 'list' and 'message' folder types exist, but it does not explain the 'name' filter or characterize pagination behavior. Baseline 3 is appropriate when the schema does most of the work.

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?

The description states a specific verb and resource ('List the account's folders'), names the folder subtypes, and enumerates the returned fields (id, name, type, size). It also cites the underlying endpoint, making it unambiguous against creation-oriented siblings like vision6_create_list or vision6_create_message.

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?

It explicitly says when the tool is needed: to obtain the folder id before creating a list or message. That is a clear usage context. It does not discuss alternatives or edge cases (e.g., when no folders exist), which keeps it below a 5.

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