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

Annotations already declare readOnly/idempotent/non-destructive, so the safety profile is covered. The description adds genuine context beyond that: what a result card contains (thumbnail, author, tags, likes) and that files are downloaded from the linked model page rather than returned directly. It does not mention paging behavior for the limit parameter, leaving one modest gap.

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?

Three sentences, zero waste: purpose and scope first, return contents second, tool routing last. The examples are compact and functional rather than filler.

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?

An output schema exists so return values need no further explanation, and annotations cover safety. The description still supplies the corpus boundary, the download-path caveat, and sibling routing, making it nearly complete; only the limit/paging behavior is unaddressed.

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?

With schema coverage at 67%, query and category are already documented in the schema. The description contributes useful example queries ('articulated dragon', 'headphone stand') that clarify phrasing, but says nothing about limit or the category enum, so it adds only marginal value over the structured fields.

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 precise verb and resource (find printable 3D models by keyword) plus supported file formats (STL/3MF/OBJ) and the specific corpus (PrintPal community library). It also explicitly differentiates itself from the two sibling generation tools, so an agent can route correctly without opening any schema.

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 an explicit boundary: 'Searches existing uploads only', then names the alternatives (generate_3d_model for AI mesh, design_parametric_cad for exact dimensions) and the condition that selects them. This is a full when/when-not/alternative mapping.

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