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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world, so the safety profile is carried. The description adds value by hedging the date range as 'expected', signalling the month's start is subject to lunar confirmation, but says nothing about calculation method, timezone handling, or what happens for an unmatched city.

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?

A single front-loaded sentence with no filler; the scope (every day of the month) and the resource come first. The parenthetical approximates the date range efficiently without bloating the text.

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 one-parameter, no-output-schema lookup, the description tells the agent what is returned (daily Fajr and Maghrib times for the month) and roughly over what window. Only minor operational details, such as timezone or calculation convention, are left unstated.

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?

Only one parameter and schema coverage is 100%, with the schema itself illustrating both a name form and a path form. The description adds no meaning beyond that, which is acceptable at this coverage level.

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 a concrete resource and output: Fajr/Suhoor-end and Maghrib/iftar times for every day of Ramadan 2027 for a city. The Ramadan-2027 scoping is specific enough to separate it from generic prayer-time siblings conceptually, though no sibling is named explicitly.

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?

Intended use (Ramadan daily suhoor/iftar scheduling) is implied by the resource itself but never stated, and there is no guidance on when to choose this over prayer_times, iqamah_times, or find_city. The city-name requirement is only discoverable from the schema.

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