is_business_day

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

No annotations are provided, so the description must bear the full burden. It does not disclose any behavioral traits beyond the core function, such as whether external holiday data is used, any authentication needs, rate limits, or side effects. The description is minimal.

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 a single, front-loaded sentence that conveys the essential purpose without any wasted words. It is appropriately sized for the tool's simplicity.

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 simple boolean-returning tool with no output schema, the description covers the main purpose. However, since no output schema exists, the agent might benefit from explicit mention of the return value (true/false). Still, the context is largely complete given the tool's straightforward nature.

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% (all three parameters have descriptions in the schema). The description adds some context by mentioning weekends and public holidays, which connects to the country parameter. However, it does not add significant new meaning beyond the schema's parameter descriptions.

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 a boolean indicating whether a date is a working day, accounting for weekends and public holidays. It uses a specific verb ('Returns') and resource ('working day'), and distinguishes it from sibling tools that compute next/previous business days or ranges.

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 use when checking a single date's business day status, but does not explicitly provide when-not-to-use guidance or mention alternative siblings (like 'next_business_day' or 'business_days_between'). No exclusions or context on when this tool is preferred.

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