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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is covered. The description adds useful content-level context (the naming languages and that each palace carries a theme and rules) and the credit cost, but says nothing about whether the result is computed from the supplied birth data or is a static reference.

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 a single front-loaded line with zero waste, followed by compact group and cost tags. Its brevity is efficient rather than padded, though it borders on under-specification.

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 tool that requires a birth date and sits in a dense cluster of Zi Wei Dou Shu siblings, the description omits the essential framing: that date/time input produces the palace layout, and how it differs from ziwei_chart/ziwei_full_chart. Output schema and annotations cover returns and safety, but the routing and input-role gaps remain.

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?

None of the six parameters are mentioned; in particular the required 'date' is never connected to the tool's output, leaving the source of the palaces ambiguous. With only 67% schema coverage, the description does not compensate for the two undocumented parameters and adds no meaning beyond the patterns.

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?

States the resource and its contents precisely: all 12 palaces with English/pinyin/Chinese names plus theme and rules. It does not, however, distinguish itself from close siblings such as astroway_ziwei_chart or astroway_ziwei_full_chart, so an agent cannot tell from the description alone why it should pick this one.

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 guidance at all, and no pointed exclusion against the numerous alternatives (ziwei_full_chart, ziwei_main_stars, or the nine ziwei_palace_* tools). The agent must infer the role of this tool purely from the name.

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