AI FileSystem MCP

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

With no annotations provided, the description carries the full burden. It discloses key behavioral traits: creates directories if needed and overwrites existing files. However, it does not mention permissions required, error handling (e.g., for invalid paths), or whether the operation is atomic, leaving some gaps for a mutation tool.

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, efficient sentence that front-loads the core action ('write content to a file') and adds two critical behavioral notes. Every word earns its place with no redundancy or fluff.

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 mutation tool with no annotations and no output schema, the description covers the basic operation and key behaviors (directory creation, overwriting). However, it lacks details on return values, error conditions, or security implications, which would be helpful given the tool's complexity and potential side effects.

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 100%, so the schema already fully documents both parameters. The description does not add any parameter-specific details beyond what the schema provides (e.g., it doesn't clarify path formats or content encoding further), meeting the baseline for high schema coverage.

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 verb ('write') and resource ('content to a file'), specifying that it creates directories if needed and overwrites existing files. This distinguishes it from sibling tools like 'update_file' (which might append or modify) and 'create_directory' (which only creates directories).

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 implies usage for writing files with automatic directory creation and overwriting behavior, but does not explicitly state when to use this vs. alternatives like 'update_file' or 'move_file'. It provides clear context for file writing operations but lacks explicit exclusions or named alternatives.

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