fm_mkdir

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

With no annotations, the description carries the full burden of describing the operation's impact. It only says 'Create a directory' and provides no information about whether the operation is destructive, what confirmation is needed, what path scope applies, or what happens on failure. It also conflicts with the schema by implying confirm is required.

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 short and the main action is front-loaded, but the Args section mostly duplicates schema titles and contains an inaccurate statement about confirm. It is concise in size but not every sentence 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 file-creation tool with no annotations, the description is under-specified. It does not explain confirm's role, whether parents directories are created, how paths are scoped, or any operation-specific behavior. The presence of an output schema helps but does not compensate for the missing input semantics.

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%, so the description must explain both parameters. It merely restates 'path' as 'New directory path' and inaccurately marks confirm as 'Required' when the schema says it has a default of false and is not in the required list. It does not explain what confirm means, its type, or its accepted values.

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 'Create a directory,' which is a specific verb and resource. It clearly distinguishes this tool from sibling file-manager operations like fm_remove, fm_copy, fm_chmod, and fm_trash.

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?

There is no guidance on when to use this tool versus alternatives, no prerequisite context, and no mention of path scope or how the directory path should be specified. The only usage note, 'confirm: Required,' is misleading because the schema does not list confirm as required.

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