Create Directory

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

Description adds idempotency behavior ('If already exists, succeed silently') and access restriction, both beyond annotations. No contradictions: annotations have idempotentHint=true, readOnlyHint=false, destructiveHint=false, which align.

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?

Description is 5 sentences, efficient but slightly redundant (e.g., 'Create a new directory or ensure a directory exists' vs idempotent mention). Front-loads purpose well.

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 output schema present, annotations provide safety profile, and description covers idempotency, nesting, and allowed directories. Complete for a straightforward 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?

Schema has 0% coverage of the path parameter. Description notes 'nested directories' implying path can include slashes but lacks explicit format, examples, or constraints. Partially compensates but insufficiently for a simple tool.

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?

Description clearly states the tool creates directories or ensures they exist, with ability to create nested ones. It distinguishes from siblings like list_directory, write_file because it's specifically for directory creation.

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?

Description explicitly mentions use cases ('setting up directory structures', 'ensuring required paths exist') and constraint ('Only works within allowed directories'). However, it doesn't mention when not to use or alternative tools for similar tasks.

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