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

The annotations already disclose that this is a non-read-only, non-destructive, non-idempotent, closed-world operation. The description adds the useful constraint that the parent must be visible. It does not explain permissions, duplicate-name behavior, or what happens when the parent is not visible, so it adds only moderate behavioral 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?

The description is a single front-loaded sentence with no redundant wording. It communicates the operation and placement scope efficiently. For a simple two-parameter create tool, this is appropriately sized.

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?

Given the simple schema, full parameter description coverage, and annotations covering safety traits, the description is nearly complete for calling the tool correctly. It only lacks peripheral details such as duplicate handling or permissions, which are minor for this operation. No output schema exists, so return-value explanation is not required.

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 both name and parentFolderId are already documented in the input schema, including that null means root. The description reinforces the parent/root distinction but adds no syntax, format, or constraint details beyond the schema. Baseline 3 is appropriate 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?

The description states a specific verb and resource: "Create a folder." It also clarifies that the folder can be placed at the root or under a visible parent. It does not explicitly differentiate itself from sibling folder operations such as rename_folder or move_folder, so it falls short of a 5.

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?

The phrase "at the root or under a visible parent" gives implied placement guidance and a visibility constraint. However, it does not state when to use this tool versus list_folders, get_folder, move_folder, or rename_folder, nor does it mention prerequisites or failure conditions. This is adequate but not explicit usage guidance.

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