macro_china_freight_index

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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, so safety is covered. The description adds only the source URL and return type, but no additional behavioral context such as network dependencies, data freshness, or output structure. It does not contradict annotations, but also does not add meaningful behavioral insight beyond them.

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 exceptionally brief, composed of a title, URL, and return type statement. It is front-loaded with the resource identity and contains no filler. While sparse, it is appropriately concise for a tool with no parameters.

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 tool has no parameters and annotations cover its safety profile, the description is minimally complete. It states the return type (pandas.DataFrame) and the value (航贸运价指数), but does not describe the data's time range, column structure, or any caveats about usage or availability. For a data retrieval tool, this is adequate but leaves 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 tool takes zero parameters, so the description cannot add parameter meaning. Schema coverage is 100% (empty schema), and the description correctly implies no input is required. Per rubric, a 0-param tool receives a baseline score of 4.

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 identifies the resource as the Sina Finance China macro freight index (航贸运价指数) and states the return type. It is distinguishable from sibling tools by the specific index name, but lacks an explicit verb like 'fetches' or 'returns' to fully articulate the action.

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 provides no guidance on when to use this tool versus alternative macro indicators or freight-related tools. It does not mention any context, prerequisites, or exclusions, leaving the agent without information to differentiate its use cases.

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