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

Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=false, and openWorldHint=false, so the safety profile is covered. However, the description adds nothing beyond that: it does not say what happens if a folder of the same name already exists, despite the non-idempotent hint making duplicate behavior the key question, nor whether the folder is created at library root or under a parent.

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?

A single short sentence with the verb and resource front-loaded and zero filler. It is efficient, though its brevity stems from under-specification rather than disciplined editing.

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 one-parameter mutation with annotations but no output schema, the description should at minimum cover duplicate-name behavior and where the folder lands. Neither is addressed, leaving an agent unable to predict failure modes or the result of the call.

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 0%, so the description must carry the parameter burden, and it only implies the single required `name` via the word "named". It gives no constraints on naming (the schema's 1–120 char bounds), no uniqueness rule, and no clarification of what "library" scope means for the name.

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?

"Creates one named library folder" gives a specific verb plus resource and scopes it to a single folder, which separates it from siblings like create_production or rename_folder. It does not explicitly name an alternative, but the resource is distinctive enough to route correctly.

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?

No when-to-use guidance, no prerequisites, and no mention of related siblings such as list_folders (to check existing folders) or move_media (to populate one). The agent must infer all usage context from the name alone.

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