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

With no annotations, the description carries the transparency burden. It discloses the output as a JSON array of layer name strings and the 'distinct' behavior, which is helpful. However, it omits edge cases (e.g., invalid DXF, empty layer lists) and does not explicitly state the operation is read-only, though that is implied.

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 well-structured and economical: the first sentence states the core action, the second gives natural-language examples, the third explains practical context and integration, and the fourth specifies the return type. No sentence 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?

The tool is simple, and the description covers the main purpose, usage, and return type. However, the unresolved parameter format and lack of error-handling details create notable gaps, especially without annotations or a detailed output schema. It is adequate but not fully complete.

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 input schema has one unnamed `dxf` string parameter with 0% description coverage. The description only says 'used in a drawing' but never specifies whether the parameter is a file path, raw DXF content, or an object. This ambiguity is a significant gap for correct invocation.

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 ('List') and the resource ('distinct DXF layer names') from a drawing. It distinguishes itself from sibling tools by focusing solely on layer listing and explicitly referencing dxf_to_geojson's layer parameter, showing its unique role.

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 example user intents ('what layers does this DXF have', 'list layers before I extract one') and explains how the result feeds into dxf_to_geojson's `layer` param, giving clear usage context. It doesn't explicitly list alternatives or when-not-to-use conditions, but the guidance is strong enough for a 4.

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