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

No annotations are provided, so the description carries the full behavioral burden. It hints at a scope constraint ('closed 3D solids') but says nothing about permissions, whether an existing file is overwritten, what happens to open/non-solid geometry, or what failure modes exist.

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?

A single, front-loaded sentence with no filler. It is appropriately sized, though it could have used its brevity budget to note an alternative export 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?

There is no output schema, so the description could have said what is returned (e.g., confirmation of the written path), and it omits overwrite/permission behavior. For a simple export tool with fully documented params, it is adequate but leaves gaps.

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 all four parameters are already documented in the schema (ids, scale, binary default true, filePath). The description's mention of 'binary or ASCII' merely echoes the binary parameter, adding no syntax or format detail beyond the schema baseline.

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?

States a specific verb (Exports) and resource (closed 3D solids) plus the output format (binary/ASCII STL). The STL format implicitly distinguishes it from cad_export_dxf and cad_export_svg, but it never names or contrasts those siblings explicitly.

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 phrase 'for 3D printing' implies a use context, but there is no explicit when-to-use/when-not guidance and no reference to the alternative export tools (dxf, svg) that an agent must choose between.

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