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

Annotations already declare readOnlyHint, idempotentHint, and non-destructive, so safety is covered. The description adds the useful 'Free' note (no credits consumed) and the nuance that a location-scoped call still returns 'everyone's' holidays. No pagination, freshness, or auth detail is given.

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?

It is a single dense catalog sentence — efficient and front-loaded with the most-used settings first — but the lack of a leading verb and the choppy semicolon list make it read like a field dump rather than a purpose statement.

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 read-only tool with no output schema, the description effectively serves as the return-value contract by naming each settings group returned. It omits only defaults (year = current year, location = all) which the schema already supplies.

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 baseline is 3, but the description goes further by explaining the year parameter as 'the public holidays of a calendar year' and clarifying the location semantics ('every location's, or one location's with everyone's'), which is genuinely beyond the schema text.

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 enumerates precisely what the tool returns: working days/hours, leave year start, time zone, leave types, public holidays, and onboarding/offboarding checklists. This lets an agent distinguish it from hr_save_settings (a writer) and from hr_list_leave, though it never states a verb or names the sibling explicitly — the title carries that load.

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?

There is no statement of when to call this versus hr_save_settings or the other hr_* readers; the only contextual cue is the trailing 'Free.' The schema-driven year/location scoping is described, but that is parameter behavior, not usage guidance.

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