Check 3D-print printability (DFM)

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

With no annotations, the description fully discloses free vs. paid behavior, the $0.01 USDC cost, x402 challenge flow, the difference between exact and heuristic fields, and how x_payment settles the challenge. This is exceptionally transparent about side effects and requirements.

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 dense and front-loaded with its core purpose. Every sentence contributes unique information about free/paid features, payment, or use case, though the length is considerable; it is concise for the tool's complexity but not maximally streamlined.

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?

For a complex tool with 10 optional parameters and no output schema, the description covers both free and paid modes, expected results, payment challenge behavior, and intended usage context. It is sufficiently complete for an agent to select and invoke the tool correctly.

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 coverage is 100%, so the baseline is 3. The description adds narrative context for 'full' and 'x_payment' but largely repeats what the schema already states, adding little new parameter-level meaning.

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 identifies a specific verb ('check') and resource ('3D-print DFM/printability... model') and lists concrete deliverables: printable verdict, watertight check, dimensions, wall-thickness, overhang heuristic. It distinguishes itself from siblings by focusing on DFM/printability rather than slicing or quoting.

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?

It explicitly says 'Great before quoting or slicing to catch thin walls, non-watertight meshes, and support-heavy geometry,' which gives clear timing and intent. However, it does not name alternatives or explicitly state when not to use this tool, so it falls short of a 5.

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