create_directory

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It mentions the "allowed directories" constraint but omits critical behaviors such as whether parent directories are created, what happens if the directory already exists, and what return value or error is produced.

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 a single, direct sentence that states the purpose without unnecessary words. It is appropriately sized for such a simple tool, though it could include more detail without becoming verbose.

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?

With no annotations and no output schema, the description leaves key operational details unstated: what defines "allowed directories," whether recursive creation is supported, and error behavior. The single parameter is well-documented, but the overall context is insufficient for a mutation tool.

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 schema provides 100% description coverage for the single 'path' parameter, explaining absolute, relative, and '~' forms. The tool description adds no parameter-specific information beyond the schema, so the baseline score of 3 applies.

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 "Creates a new directory" and the resource, with the constraint "within allowed directories." It distinguishes from sibling tools like change_directory or delete_file, though it does not explicitly differentiate from higher-level creation tools such as create_workspace.

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 is provided about when to use this tool versus alternatives, no exclusions, and no prerequisites. The only implied context is the tool's name and the vague restriction to "allowed directories," which is not explained.

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