calculate_fasting_times

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

No annotations are provided, so the description carries the full burden. It only states the output and the 31-day limit, but does not disclose behavior around latitude/longitude, what happens if they are omitted, calculation method, or return structure. The agent is left guessing about important runtime behavior.

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 two brief sentences, front-loaded with the primary purpose, and avoids any filler. Every word contributes value, making it easy to parse quickly.

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?

With no output schema and no annotations, the description is incomplete for the tool's complexity. It omits parameter semantics for latitude/longitude, fails to describe the return format, and does not mention any prerequisites or default behaviors. The existing information is insufficient for an agent to use the tool confidently.

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 description coverage is 0%, so the description needs to compensate. It clarifies that dates are in ISO 8601 format, which helps for start_date and end_date, but latitude and longitude are entirely unmentioned. The agent cannot determine whether these optional parameters affect the output, and their relevance is unclear.

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 returns Suhoor end (Fajr) and Iftar start (Maghrib) for each day in a date range, using specific religious terms that distinguish it from sibling tools like get_prayer_times or get_monthly_prayer_calendar. The verb 'Return' and explicit resource make the purpose unmistakable.

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 for obtaining fasting times within a date range and notes a max of 31 days, but it does not explicitly compare to alternative tools or mention when not to use it. Given the many sibling tools, explicit differentiation would improve clarity, but the core use case is inferable.

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