Daily Horoscope

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

Annotations already indicate read-only, non-destructive, idempotent, and closed world. The description adds that the horoscope is 'grounded in real ephemeris data' (current Moon phase, transits) and 'AI-written, not pre-generated', disclosing data freshness and content generation beyond annotations.

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 concise with two sentences plus group/cost info and an example. Key information (generate daily horoscope, data grounding, multi-language, AI-written) is front-loaded. No wasted words.

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 the annotations and schema, the description covers the purpose, data source, language support, and cost. It lacks explanation of the return format and the disclaimer_inline parameter, but the overall context is sufficient for a straightforward daily horoscope tool.

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 0%, so the description must compensate. It provides an example request body showing sign, date, and language, which adds some meaning. However, it does not explain the disclaimer_inline parameter or the date format beyond the example. This is minimally viable.

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 generates a daily horoscope by zodiac sign, grounded in real ephemeris data. It specifies the verb 'Generate' and the resource 'daily horoscope', and distinguishes from siblings like horoscope_monthly, weekly, and yearly by focusing on daily readings.

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 provides clear context that the tool is for daily horoscopes, implying when to use it. However, it does not explicitly exclude other time periods or mention alternatives, though the title and content make the daily scope evident.

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