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

With no annotations, the description carries the full behavioral burden and does well: it discloses the return payload (model, DXF, SVG, cut list, BOM, build report), the cost ('1 credit per call'), and content policy limits. It does not mention regeneration/determinism or any failure/limitation behavior, so it is strong but not exhaustive.

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 dense paragraph with the core promise front-loaded, then examples, supported kinds, optional inputs, exclusions, and cost. Every sentence adds distinct information and nothing is redundant, despite the length.

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?

Complete for a 7-param generation tool with no output schema and no annotations: the description substitutes for the missing output schema by enumerating every returned artifact, and it covers inputs, enums, exclusions, and cost. Only minor gaps (title param, dimension ranges) remain, which the schema itself supplies.

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 0%, so the description must compensate. It does for most fields: 'brief' is richly shown via examples, 'kind' and 'wood' enum values are restated, and dimensions are shown in mm units through examples. However, the 'title' parameter is never mentioned and the min/max dimension bounds are left entirely to the schema.

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 action and resource: turn a plain-language brief into a complete design package, enumerating the concrete artifacts produced (STL/viewer, DXF cut layout, SVG, cut list, BOM with cost, fastener count, weight, build report). That level of output specificity separates it from generic CAD siblings like cad_part or cad_calc, though it never explicitly names or contrasts those siblings.

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?

Gives concrete invocation examples ('a 6 ft workbench', 'bookshelf 800 x 300 x 1800 mm'), an explicit supported-type list, and clear exclusions ('Does not design weapons, firearms, ammunition or explosives') plus a cost note. It stops short of stating when to prefer this over sibling tools such as arch_design or cad_part.

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