Desktop Commander MCP Server

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

With no annotations provided, the description carries the full burden and does well by disclosing key behavioral traits: idempotent behavior ('succeed silently if already exists'), ability to create nested directories, and the constraint 'only works within allowed directories'. It doesn't mention permissions, rate limits, or error conditions, but covers the essential operational behavior.

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?

Four concise sentences, each earning its place: states core functionality, explains nested creation capability, describes idempotent behavior, and provides usage context with constraints. Front-loaded with the essential operation, zero wasted words.

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 no annotations or output schema, the description is quite complete - it explains what the tool does, its behavior, constraints, and use cases. The main gap is lack of information about return values or error conditions, but given the simplicity of the operation, it's reasonably comprehensive.

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?

With 0% schema description coverage for the single 'path' parameter, the description compensates by explaining what the path represents ('directory or nested directories') and the operational context ('within allowed directories'). It doesn't specify path format or constraints, but adds meaningful context beyond the bare schema.

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 tool's purpose with specific verbs ('create', 'ensure exists') and resource ('directory'), distinguishing it from siblings like list_directory or move_file. It explicitly mentions creating nested directories, which differentiates it from simple file operations.

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 provides clear context for when to use this tool ('setting up directory structures for projects or ensuring required paths exist'), but doesn't explicitly state when NOT to use it or name specific alternatives. It implies usage for directory creation rather than file operations, but lacks explicit exclusions.

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