Stat

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It implies a read-only operation via 'Fetch', but it does not mention behavior on missing paths, symlink resolution, permission requirements, or whether an error is raised. These are meaningful gaps for a filesystem 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, direct sentence with no filler or redundancy. It front-loads the action and resource immediately, making it easy to scan. Nothing here is wasted.

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 a single required parameter and a present output schema, the description covers the basic invocation shape. However, it lacks usage context, error semantics, and path expectations, leaving an agent to guess about edge cases. It is minimally viable but not fully self-sufficient.

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?

The schema has 0% description coverage, so the description needed to compensate, but it only restates the parameter name by saying 'for a path'. It adds no detail about absolute vs relative paths, file vs directory support, or formatting constraints. This is minimal semantic value beyond the schema's property name.

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 uses a specific verb ('Fetch') and resource ('filesystem metadata') for a given path, which clearly distinguishes it from siblings like read_file, exists, and list_dir. It doesn't explicitly compare itself to those tools, but the core purpose is unmistakable. It loses one point for not specifying what metadata is returned.

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 stat versus alternatives like exists, read_file, or list_dir. The description merely states the operation without mentioning exclusions, prerequisites, or typical use cases. Sibling tool names imply some alternatives, but the description itself provides no routing.

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