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

readOnlyHint=true already declares the safe read profile, so the description's burden is lower. It adds that documents are library-scoped and cites the underlying Management API endpoint, but says nothing about pagination behavior despite page/page_size params, nor about what the response contains.

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 short sentences, front-loaded with the action, followed by the concrete API endpoint. No filler or redundancy.

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 paginated list tool with no output schema, the description omits return-shape and pagination guidance that an agent would need to page correctly, and does not distinguish the result set from list_files. Annotations only cover the read-only safety hint.

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 page, page_size, search and library_id are all documented in the schema with defaults and bounds. The description adds no syntax or semantics beyond that, which is the expected baseline when the schema does the heavy lifting.

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?

Clear verb+resource: lists documents scoped to a given library, which agent can distinguish from mistral_list_libraries and mistral_list_files. However, it doesn't explicitly state how it differs from list_files (the library-scoped vs. global file listing).

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?

Usage is implied by requiring a library_id ('uploaded to a given document library'), so an agent knows it's for enumerating a specific library's contents. But there is no explicit when-to-use guidance or any named alternative (e.g., list_files) to route between.

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