Cross-Platform Filesystem 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 of behavioral disclosure. 'Write content to a file' implies a mutation operation, but it doesn't specify critical details like whether it overwrites existing files, requires specific permissions, handles errors, or has side effects. This leaves significant gaps for an agent to understand the tool's 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?

The description is extremely concise with a single, direct sentence ('Write content to a file') that efficiently communicates the core purpose without any wasted words. It's front-loaded and appropriately sized for a simple tool.

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?

Given the complexity of a file write operation with no annotations and no output schema, the description is incomplete. It lacks details on behavior (e.g., overwrite vs. append), error handling, or return values, which are essential for an agent to use this tool effectively in a filesystem context.

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 documents all three parameters (path, content, encoding) with descriptions. The description doesn't add any additional meaning beyond what the schema provides, such as explaining parameter interactions or constraints, which aligns with the baseline score 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 action ('write') and resource ('content to a file'), making the purpose immediately understandable. However, it doesn't differentiate from sibling tools like 'create_directory' or 'move_item' beyond the basic verb+resource pairing, which prevents a perfect score.

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 on when to use this tool versus alternatives. For example, it doesn't clarify if this should be used instead of 'create_directory' for file creation or how it relates to 'read_file' for file operations. The description offers no context about prerequisites or exclusions.

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