Create Directory

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

Annotations already declare readOnlyHint=false, idempotentHint=true and destructiveHint=false, so the safety profile is covered. The description adds real context beyond that: nested creation in one call, silent success when the path already exists, and confinement to allowed directories. Return/pagination behavior is not described, but an output schema exists.

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?

Front-loaded with the core action and idempotency behavior, with no redundant sentences. The 'Perfect for...' sentence is mildly promotional but still carries usable usage context, so it earns its place.

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 single-parameter mutation tool with idempotency covered by annotations and return values covered by an output schema, the description supplies the key missing pieces: nested creation, silent success, and the sandbox restriction. What remains thin is only path-format guidance.

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% and there is one required parameter, so the description carries the burden of explaining the 'path' argument. It only indirectly hints at path constraints via the allowed-directories note, and says nothing about whether the path is absolute, relative, or a file-vs-directory form.

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 new directory'), and further scopes it with nested-directory creation and silent-on-exists semantics. No sibling tool in the list performs directory creation, so an agent can identify this unambiguously.

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?

It gives concrete usage contexts ('setting up directory structures for projects or ensuring required paths exist') and states the sandbox constraint ('only works within allowed directories'). It does not name an alternative tool or an explicit when-not-to-use case, which is minor here since no sibling overlaps.

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