mail_create_folder

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

With no annotations, the description carries the full burden. It usefully discloses that intermediate nesting is created (path segments) and that the leaf id is returned, but omits what happens on duplicate paths (error vs idempotent), whether parent folders must pre-exist, and any permission requirements.

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 with zero filler; the core action and format example come first, the return value second. Every clause carries information.

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?

The output schema covers the return value, so 'Returns the leaf id' is optional reinforcement. For an unannotated mutation tool, however, the description should still address conflict/duplicate behavior and prerequisites, which it does not.

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 0% and the single 'path' parameter has no schema description, so the description's 'Work/Clients/Acme' example is the only thing defining the expected format and separator convention. It still doesn't say whether leading/trailing slashes or absolute paths are accepted.

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 a nested mail folder path') and includes a concrete path example. The 'mail' qualifier implicitly separates it from the sibling drive_create_folder, though that alternative is never named explicitly.

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 guidance on when to use this rather than drive_create_folder or how it relates to mail_folder_tree. Nothing tells the agent whether this is safe to call when the folder may already exist.

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