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

Annotations already declare readOnlyHint, idempotentHint, and openWorldHint=false, so the safety profile is covered. The description adds the useful 'generic' (non-personalized) framing and the cost line, but does not describe cadence, window granularity, or what the caution windows look like beyond a parenthetical list.

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?

Extremely tight and front-loaded: one content sentence plus metadata tags, with zero filler. It is arguably under-specified rather than verbose, but nothing is wasted.

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?

An output schema exists, so return-value detail is not required, and the read-only profile is covered by annotations. What is missing is any guidance on selection versus siblings and any input context, leaving the definition just barely sufficient.

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 description says nothing about any parameter. The required `date` parameter has no schema description (only a regex pattern), and with coverage at 67% the description should compensate for that gap rather than stay silent on inputs.

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 identifies the resource (caution windows) and enumerates its contents (Mercury Rx, eclipses, Mars Rx, major macro aspects), so an agent understands it returns market-timing hazard periods for a date. It does not, however, distinguish itself from close siblings like astroway_calendar_retrograde_periods or astroway_calendar_eclipses, which cover overlapping phenomena.

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, no prerequisites, and no named alternatives. The word 'Generic' hints the result is not personalized to a natal chart, but the description never states when an agent should prefer this tool over the financial_* or calendar_* siblings.

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