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

No annotations are provided, so the description carries the full burden. It usefully discloses the core algorithm (balls blend into one skin, one radius per point) and a practical tip about oversizing radii, but says nothing about whether this creates a new object, how threshold/resolution affect the result, or what is returned on completion.

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 filler, and the defining behavior is front-loaded before the use cases and the practical tip. Every sentence earns its place.

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 mutation tool with no annotations, no output schema, and 0% schema coverage, the description covers the concept and radii well but leaves threshold, resolution, and post-call behavior undefined. Adequate to attempt a call, incomplete for confident parameter choices.

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% across 5 parameters, so the description must compensate. It meaningfully explains the points/radii pairing and gives actionable guidance on radius sizing, but threshold and resolution — both tuning parameters a caller must choose — are never mentioned, leaving two of five parameters undocumented anywhere.

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 and resource — 'Make one smooth organic mesh from overlapping balls (metaballs)' — and immediately names the defining behavior (balls merge into a single skin). An agent can distinguish this from sibling mesh-creation tools like create_primitive or rock without opening a 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 concrete use cases ('Good for hands, clouds, bushes, rocks, creature bodies'), which tells the agent when this tool is appropriate. However, it names no alternatives or exclusions — e.g., when to prefer create_primitive, combine, or remesh — so routing between siblings is left to inference.

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