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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds real value beyond that by enumerating the returned prayer-time fields, which matters since there is no output schema, though it says nothing about return ordering or formatting.

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 the resource first and the scoping qualifiers after it. Every clause carries information (verb, enumerated return fields, regency scope, date scope) and there is no filler.

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 two-parameter read-only lookup with rich annotations, the description covers purpose, scope and returned fields. The only omissions are the today-fallback for tanggal (already in the schema) and any note on output ordering, which are minor.

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 100%, so both parameters are already documented in the schema, including the YYYY-MM-DD format, the today default, and the pointer to sholat_list_kota. The description only restates the regency-and-date scoping and adds no syntax or semantics beyond the schema, so baseline 3 applies.

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 specific verb (Get) and resource (daily prayer times), and enumerates the exact fields returned (imsyak, shubuh, dzuhur, ashr, maghrib, isya) scoped to a regency and date. The word 'daily' implicitly contrasts with the sholat_monthly sibling, but no sibling is named, so differentiation is left to inference.

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?

Usage is only implied: the daily scope plus required kabupaten_id signals this is the single-day lookup, and the schema points to sholat_list_kota for finding the id. There is no explicit statement of when to prefer sholat_monthly over this tool or any prerequisites for the regency id.

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