Create Directory

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

The description adds context beyond annotations: nested directory creation, silent success if exists, and restriction to allowed directories. Annotations already indicate idempotency and non-destructive behavior; description reinforces and expands.

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 four sentences, each adding value: purpose, capability, behavior, use case, constraint. No redundant or irrelevant 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?

Given the tool's simplicity (one parameter, annotations present, output schema exists), the description covers purpose, behavior, constraints, and use cases adequately. No major gaps.

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?

The sole parameter 'path' has no schema description coverage (0%). The description mentions 'only works within allowed directories' but does not specify path format, allowed directories list, or how to specify nested paths. Partial compensation but insufficient detail.

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 clearly states the action: 'Create a new directory or ensure a directory exists.' It specifies the ability to create nested directories and the silent success on existing directories, distinguishing it from siblings like write_file or move_file.

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 description gives usage scenarios ('Perfect for setting up directory structures for projects or ensuring required paths exist'), implying when to use. It does not explicitly mention when not to use or alternatives, but the context is clear.

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