zcell_list_regions

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

The description states 'Read-only' which aligns with the annotation readOnlyHint=true, and adds that it returns each region and whether it is configured. This provides some behavioral context beyond the annotation, but does not disclose potential side effects, pagination, or other constraints.

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 with only two sentences. The first sentence states the main purpose, and the second adds key features. No extraneous information.

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 list tool with two optional parameters and no output schema, the description provides a minimal return format (region and configured status). However, it does not clarify the structure of the response or mention any filtering or pagination behavior, leaving some gaps.

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 description mentions no parameters. The schema has two parameters: 'query' (well-described in schema) and 'skip_sku_check' (no description). With 50% schema coverage, the description should add meaning for the undocumented parameter but fails to do so.

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 verb 'List' and the resource 'Zscaler Cellular regions available/configured for the customer', differentiating it from sibling tools that list other entities. It specifies the output (each region and its configuration status), making the purpose unambiguous.

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 guidance is provided on when to use this tool versus alternative tools for listing other resources. There is no mention of context, prerequisites, or conditions that would help an agent choose this tool over others.

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