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

With no annotations provided, the description carries the behavioral disclosure burden. It usefully discloses that the tool returns a concise interpretation and costs ¥0.05 per call, but it does not mention side effects, permissions, rate limits, or what happens on invalid input. This is acceptable for a simple paid lookup tool but not comprehensive.

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?

Every sentence earns its place: it states the function, defines the input, describes the output, and discloses the cost. The purpose is front-loaded and 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?

For a simple one-parameter tool with an output schema present, the description covers the essential call information: input semantics, output type, and cost. It lacks explicit alternative routing and detailed input syntax, but the low complexity and existing output schema keep these omissions minor.

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 schema gives only a bare string parameter `q` with no description, and schema coverage is 0%. The description compensates by explaining that `q` should contain Ten Gods/Heavenly Stems-Earthly Branches keywords and provides a concrete example ('正官'). It does not specify formatting for multiple keywords, but for a single-parameter tool this is strong compensation.

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 verb and resource: '八字快速解读' (quick Bazi interpretation), and clarifies the exact input type ('十神/干支关键词') and output type ('简明解读'). This clearly distinguishes it from the sibling ziwei_life_read, which targets a different fortune-telling system.

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 implies usage by specifying the input format and the 'quick' nature of the tool, but it never explicitly states when to prefer this over alternatives such as ziwei_life_read or diagnose, nor does it provide any exclusion criteria. The guidance is implied rather than explicit.

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