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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the 'Read-only' sentence is largely redundant. However, the description adds non-obvious behavior beyond the annotations: the deterministic return ordering (folders first, name-sorted) and the fact that resulting file ids feed drive_download_file, which is useful operational context.

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, front-loaded sentences with zero filler: purpose and ordering first, parameter guidance second, cross-tool routing last. 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?

For a simple read-only list tool with no output schema, the description covers scoping, ordering, and how returned ids are consumed downstream. It does not describe pagination behavior or the fields present on returned items, but that gap is minor for this tool's complexity.

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 all three parameters are already documented in the schema, including parentId's root/omit semantics and limit/offset defaults and bounds. The description restates the parentId behavior but adds no syntax or constraint detail beyond the schema, 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 (list) and resource (files and folders in the account's Faivelo Drive) and even specifies the result ordering (folders first, then name-sorted). It is clearly distinguishable from drive_download_file, which is named as the follow-up tool.

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?

Explicitly states when to omit parentId (root) versus pass a folder id (inside a folder), and names the alternative tool drive_download_file with the condition for using it. Nothing is left to inference.

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