macro_usa_house_price_index

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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety/side-effect profile is covered. The description adds the source URL and the historical start date (1991-03-01), which is useful context, but says nothing about update cadence, auth, or rate limits.

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 text is short and front-loads the resource name and coverage window. It is slightly redundant, repeating the resource name in the ':return:' line and including a bare URL with no explanation, but there is no filler.

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 parameters, no output schema, and annotations covering the safety profile, the minimum bar is low and a data range plus ':rtype: pandas.DataFrame' is adequate for correct invocation. It still omits what the returned DataFrame contains (columns, units/frequency beyond '月率'), which leaves a gap for a data 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 and the input schema is empty, so there is nothing for the description to clarify; the baseline for a no-parameter call is 4. The description cannot and need not add parameter meaning.

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 names a specific resource and frequency ('美国FHFA房价指数月率报告') plus its temporal coverage (1991-03-01 to present), which is more informative than a tautology. It does not, however, differentiate itself from adjacent housing/macro siblings such as macro_usa_phs, macro_usa_nahb_house_market_index, or macro_usa_house_starts, so an agent must infer the distinction.

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?

There is no when-to-use or when-not-to-use guidance and no named alternative. The data-range note is a scope fact, not usage direction, so the agent gets no help choosing among the many macro_usa_* siblings.

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