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

Annotations already provide idempotentHint=true and destructiveHint=false, so the description only adds the notion of 'switching', which implies replacing the current terrain. It does not elaborate on effects (e.g., whether existing terrain is removed) or expected outcomes, but no contradiction exists.

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 a single, compact sentence that efficiently conveys the core purpose and supported provider types. There is zero redundancy or 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?

Given the low complexity (3 params, no output schema) and rich structuralschema/annotations, the description is adequate. It defines the resource and provider options. The only minor gap is not explicitly noting parameter dependencies (e.g., cesiumIonAssetId when provider=cesiumion), but the schema already covers this.

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 the schema fully documents each parameter (provider, url, cesiumIonAssetId). The description merely repeats the provider enum values, adding no new meaning beyond what the schema already provides.

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 states the tool's function: '加载或切换地形' (load or switch terrain), with specific provider types listed (flat/ArcGIS/CesiumIon/custom URL). This verb+resource phrasing distinguishes it from sibling tools like load3dTiles or setBasemap, which target different data types.

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?

Usage context is implied by the title and description ('load or switch terrain'), but there is no explicit guidance on when to choose this over alternatives, nor any exclusions or prerequisites. The sibling tools show related operations but the description does not reference them.

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