Read a CityJSON Extension schema

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

No annotations are present, so the description carries the burden. The phrase 'Fetch ... from the canonical ... URL' conveys a read-only remote retrieval and identifies the source. It doesnot, however, disclose behavior on invalid versions, missing extensions, or the exact returned representation, which would make the behavior more transparent.

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, focused sentence with no filler. The action and target are front-loaded, and the canonical URL is supplied as useful context without excess detail.

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?

This is a low-complexity retrieval tool, and the required parameters and their formats are fully specified by the input schema. However, with no annotations and no output schema, the description is missing explicit return-value or error behavior guidance, so an agent must infer what the tool returns and how failures are signaled.

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%, and the description does not explain the semantics of 'name' or 'version'. The parameter names are self-explanatory and the JSON Schema patterns define valid formats, but the tool description itself adds no 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 identifies a specific verb+resource: fetching a registered CityJSON Extension schema from the canonical registry URL. The title and description align, and the resource is concrete enough to distinguish this from most sibling tools. However, it does not explicitly contrast itself with cityjson_extensions_registry, which is the closest sibling for registry 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 canonical registry URL and 'registered Extension schema' imply that this tool should be used when an agent needs a specific schema by name and version. There is no explicit statement about when to prefer cityjson_extensions_registry or other schema-related tools, nor any exclusionary guidance, so the usage context is implied rather than explicit.

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