Get regions

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

The readOnlyHint annotation already indicates a safe read operation. The description adds meaningful context beyond that by explaining the hierarchy (id, name, parent region id), which helps the agent understand the data structure. It does not contradict the annotation.

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 concise and front-loaded, with the primary purpose stated in the first sentence. The hierarchy details are useful. The trailing 'Operation: GetRegions' is redundant and adds little value, slightly detracting from conciseness.

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?

With no output schema, the description partially explains the return shape (hierarchical regions with id, name, parent id). It could be more explicit about whether the list includes all levels or how parent relationships are represented, but for a simple read-only list tool it provides sufficient context.

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?

The tool has zero parameters, so the baseline of 4 applies. The description does not need to explain parameter semantics, and the schema fully covers the empty parameter list. No additional parameter information is required.

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 returns a list of geographic regions, specifying the resource type (countries, regions, cities) and the hierarchical structure. This is a specific verb+resource definition that distinguishes it from other get/list tools like get_product or list_categories.

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?

No explicit when-to-use or alternatives are mentioned, but the name and description imply it is the tool for fetching geographic regions. There is no competing regions tool among siblings, so the intended usage is easily inferred, but explicit guidance is absent.

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