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

Annotations already declare destructiveHint=false, idempotentHint=true, and openWorldHint=false, so the safety and idempotency profile is largely covered by structured data. The description restates idempotency ('same idempotency key return the same folder') with slightly more concrete wording, but says nothing about permissions needed to create a team-visible folder, name-collision behavior, or limits.

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 compact sentences with no filler; the core action and its two main modifiers are front-loaded, and the idempotency note is a single tight clause. Nothing is repeated or padded.

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?

An output schema exists, so return values need no explanation, and annotations cover the safety profile. For a create mutation the description is nearly complete, with only minor gaps around permissions for team visibility and duplicate-name handling.

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 coverage is 50%: name and idempotencyKey are well documented in the schema, while visibility and parentFolderId are not. The description partially compensates by spelling out the private/team choice and the optional parent folder, but this largely restates the enum values and the nullable anyOf, adding little beyond the structured fields.

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 ('Create ... folder') and immediately scopes it with the visibility options and optional nesting, which is enough for an agent to identify the operation. It does not explicitly differentiate itself from the many folder siblings (rename_folder, archive_folder, move_to_folder, get_folder), so the distinction rests on the verb alone.

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 'optionally nested under a visible folder' implies when to supply parentFolderId versus leaving it null, which is useful implied guidance. However, there is no explicit when-to-use or when-not-to-use statement and no routing to alternative tools such as sheets_move_to_folder or sheets_rename_folder for adjacent folder operations.

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