index_all_cni

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

The annotations already declare readOnlyHint=true, openWorldHint=true, idempotentHint=true, and destructiveHint=false, covering the safety profile. The description adds the data source URL and return type (pandas.DataFrame), which provides modest behavioral context beyond the annotations. However, it does not disclose details like update frequency, pagination, or data completeness, so it does not go far beyond the structured metadata.

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 extremely concise, with the main phrase front-loaded followed by a URL and return type. Every line earns its place except perhaps the redundant :return and :rtype lines, which repeat the implied output. Slightly more structure (e.g., a clear verb) would improve clarity, but it is not bloated.

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 parameterless read-only tool with rich annotations (readOnly, openWorld, idempotent, non-destructive), the description is nearly sufficient. It names the specific data set (all CNI indices of the most recent trading day), provides a source URL, and states the return type. It does not explain the exact columns or data format, but given no output schema and the tool's simplicity, the omission is acceptable.

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 has zero parameters, and the schema is vacuously 100% covered. Per the rubric, a no-parameter tool gets a baseline of 4 because there is no parameter semantics to clarify. The description adds no parameter-related content, which 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 resource ('国证指数' / CNI indices) and scope ('最近交易日的所有指数' / all indices of the most recent trading day), which aligns with the name 'index_all_cni'. It includes a source URL and return type, which helps distinguish it from sibling index tools like index_detail_cni or index_hist_cni, though it lacks an explicit verb like 'fetch' or 'list'.

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 alternatives. It does not mention conditions like 'for all CNI indices' or exclude other index-related tools. The sibling list contains many index tools, but the description offers no differentiation or selection criteria.

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