macro_usa_trade_balance

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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, covering the safety profile. The description adds the temporal coverage (19700101-至今), the upstream source URL, and the return type (pandas.DataFrame), which is useful context but stops short of pagination, refresh cadence, or rate-limit behavior.

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?

Very short and front-loaded with the resource name, then scope, source, and return type in docstring form. The :return:/:rtype: tags are slightly redundant given the return is already implied, but there is no padding.

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 no-parameter tool with no output schema, the definition supplies the source and date range but never describes the columns/fields the returned DataFrame contains. An agent cannot know what values to expect, leaving a meaningful gap for a data-retrieval tool.

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 there is nothing for the description to disambiguate. Baseline 4 applies; no parameter-level value could be added.

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 states a specific resource ('美国贸易帐报告' – the US trade balance report) and its temporal coverage, so an agent knows it returns US trade balance data. The 'usa' prefix distinguishes it from the many macro_usa_* siblings, though it does not explicitly contrast with macro_china_trade_balance or macro_euro_trade_balance.

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 when-to-use guidance, prerequisites, or alternative tools are mentioned. The 1970-present range hints at scope but is not usage direction, and nothing tells the agent when this report is preferable to a sibling macro indicator.

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