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

No annotations are provided, so the description carries full burden. It explains the tool's scope (transiting planets only, no birth chart) and lists the included patterns. However, it does not disclose the output format (text/JSON), whether it is read-only, or any error conditions (e.g., invalid date). The absence of side-effect disclaimers is acceptable for a query tool, but behavioral transparency is only moderate.

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: two sentences without any filler. The first sentence lists the key outputs (aspects, stations, void Moon), and the second clarifies the scope ('no birth chart or location needed'). Every word earns its place, making it easy to scan.

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 no output schema, the description should explain return values, but it only says 'snapshot'. It does not specify whether the result is a list, a summary text, or structured data. The tool has three parameters and moderate complexity, so more detail about the output format and potential errors (e.g., invalid date) would make it complete.

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 descriptions for all three parameters, so baseline is 3. The description adds context by mentioning 'within a window' for stations, which hints at the 'window_days' parameter, but does not provide additional syntax or examples. No parameter is explained beyond what the schema already offers.

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 provides a snapshot of the 'mundane sky' including active aspect configurations (T-squares, grand trines, etc.), stationing planets, and void-of-course Moon. It specifies it does not require a birth chart or location, distinguishing it from sibling tools like 'natal_chart' or 'synastry'. The verb 'snapshot' accurately conveys a summary report.

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 gives clear context for when to use this tool: for a generic, location-independent daily astrological overview. It does not explicitly state when not to use it or mention alternative tools (e.g., 'aspect_patterns' for detailed aspects, 'void_of_course' for just void Moon), but the scope is well-defined by the content and the sibling names provide implicit guidance.

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