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

Annotations already establish this as a safe read (readOnlyHint=true, destructiveHint=false), and the description adds real value beyond them: it flags the data as 'Sensitive payroll data' and states the confirmed-pay-period precondition. It stops short of describing pagination behavior or volume limits, but the safety profile and sensitivity caveat are covered.

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?

Three short sentences with the resource and scope front-loaded and zero filler; the trailing GET path is the only arguably low-value token. Slightly telegraphic phrasing, but nothing is wasted.

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?

With no output schema, the description usefully sketches the return shape ('amount, vacation days'), and it covers the key prerequisite (confirmed pay period) and sensitivity for a payroll-adjacent read. An agent could call this correctly without further reading, though pagination expectations are left entirely to the 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 description coverage is 100%, so accrual_type, pay_period, paygroup_id, employee_ids, page and rpp are all documented in the schema itself. The description only restates the accrual_type values (already an enum) and the confirmed-period constraint, adding no new meaning for filtering or pagination params. 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+resource ('Accruals per employee for a confirmed pay period') and enumerates the accrual types it covers, plus the fields returned. It is clearly distinct from jisr_list_payroll_transactions by name, but the description never explicitly contrasts the two.

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 phrase 'for a confirmed pay period' implicitly gates usage on a pay period being confirmed, which is useful context, but there is no explicit when-to-use/when-not guidance or pointer to alternatives like jisr_list_payroll_transactions or jisr_get_annual_leave_balances.

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