ncloud_get_nas_volume_rating_list

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

The annotations already declare readOnlyHint: true, so the agent knows the tool is safe. However, the description adds no additional behavioral context (e.g., response format, pagination, rate limits, or side effects). For a read-only tool with annotations, the bar is lower, but even minimal context like 'returns time-series data' would improve transparency.

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, concise sentence with no redundant information. It front-loads the action and resource. A 5 would require slightly more informative phrasing without adding bulk (e.g., 'retrieves historical size usage data points').

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?

Despite 100% schema coverage and readOnly annotation, the description lacks important context. There is no output schema, but the description does not explain what the returned list contains (e.g., timestamps, values, units). The tool is simplistic but the agent needs to know what 'size measurement list' means in terms of response structure.

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% (all parameters have descriptions), so the baseline is 3. The description's phrase 'for a specific time period' alludes to startTime and endTime, but the schema already documents their format. No additional semantics are added, so a score of 3 is appropriate.

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 retrieves a list of NAS volume size measurements for a given time period. The verb 'Get' and resource 'NAS volume size measurement list' are specific, and the constraint 'for a specific time period' distinguishes it from sibling tools like ncloud_list_nas_volumes (which lists volumes without measurements) and ncloud_get_nas_volume_detail (which gets a single volume's config). A 5 would require more detail on what 'size measurement' means (e.g., used capacity, data points).

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 does not provide any guidance on when to use this tool versus alternatives like ncloud_list_nas_volumes or ncloud_get_nas_volume_detail. It lacks explicit context on prerequisites, limitations, or when not to use it. The agent is left to infer usage from the name and parameters alone.

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