design_add_snowfield

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

With no annotations supplied, the description must carry the behavioral burden. It does clarify that a new layer is created with drift, shadow tinting, and sparkle already baked in, but it says nothing about layer-stack placement, whether existing layers are modified, or whether the operation is reversible.

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?

Two sentences, zero filler, with the core action front-loaded and configuration information trailing. Nothing to cut.

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?

Nine optional parameters, no annotations, and no output schema leave gaps the description does not close: what the call returns (a layer reference?), where the layer lands in the stack, and what happens if a snowfield already exists. Adequate but clearly incomplete for a tool this configurable.

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 baselines at 3. The description lightly maps to parameters ('drift patterns' → driftIntensity, 'sparkle highlights' → sparkleIntensity) and repeats the preset enum verbatim, but adds no format, range, or default semantics beyond 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 verb and resource: adds a 'snow-covered ground layer' with three named visual features. That is far more concrete than a generic 'add layer', though it never names a sibling to contrast with, so an agent must infer that design_add_terrain_profile or design_add_fog_layer are different operations.

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 description gives no when-to-use or when-not guidance and never mentions alternatives in a sibling list crowded with ground/atmosphere tools. The preset list is configuration, not usage guidance.

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