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

Beyond the read-only annotations, the description discloses important behavior: reasons include weekend, named public holiday with status, or Friday half day; Islamic holidays may be estimated or confirmed; and responses include data_confidence, estimated_items, sources, and data_version. It also gives a concrete example showing sector-dependent results.

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 purpose and usage context are front-loaded, followed by the critical moon-sighting caveat and a compact example. Despite covering several nuances, no sentence is wasted and the structure supports quick agent scanning.

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 tool's complexity, rich schema, annotations, and output schema, the description is complete enough for correct invocation. It explains the core result reasons, confidence semantics, estimated-item handling, and sector/emirate sensitivity without redundantly restating the full schema.

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%, so the baseline is 3. The description adds value with an example showing how date, emirate, and sector affect the result, but it does not discuss apply_optional_overlays, so it does not fully compensate or add complete parameter semantics beyond the schema.

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 opens with a specific verb and resource: telling whether a date is a UAE working day for a given emirate and sector, and explaining why not. It clearly distinguishes this from calendar-listing or range-computing siblings by framing the tool as a single-date working-day check with reasons.

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?

It gives clear usage context: call before scheduling, promising delivery, booking, or filing anything on a UAE date. It does not explicitly state when not to use it or name alternatives such as working_days_between or next_holiday, so it falls short of a full 5.

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