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

Annotations already indicate read-only, open-world, idempotent, non-destructive behavior. The description adds value by stating the data is one record per day (end_of_day) and lists the tenors, which is useful context beyond the annotations. No contradiction.

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?

Two sentences, no wasted words. Core information (what, tenors, source, how to use dates) is front-loaded in the first sentence. Highly efficient.

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 8 parameters, no output schema, and rich annotations, the description covers the essential purpose and data scope. It could briefly mention return format or pagination, but the annotations handle safety aspects. Overall adequate.

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 coverage is 100% with all 8 parameters described. The description only mentions from/to and their windowing purpose. It does not add meaning beyond the schema for other parameters like fields, offset, or pagination. Baseline 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 returns HKD interbank offered rates (HIBOR) by tenor, listing all tenors (overnight, 1-week, 1/3/6/9/12-month), and specifies it provides one record per day (end_of_day) from a specific source. This distinguishes it from sibling tools like hkma_exchange_rates or hkma_interbank_liquidity.

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 explains how to window dates using from/to, but does not explicitly mention when not to use this tool or refer to alternatives. The context is clear for HIBOR data, but lacks explicit guidance on when to choose a sibling tool.

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